KR19980076220A - How to set up and release call forwarding service in satellite communication system - Google Patents

Abstract

The present invention provides a method for setting and releasing a call forwarding service in a satellite communication system that enables a subscriber to set up or release an automatic call transfer service (CTX) using a phone of a subscriber other than his own phone. The present invention relates to a satellite communication system for providing an incoming call switching function by combining a plurality of base stations respectively coupled to a plurality of subscribers through satellites; A non-subscriber use code determination step of determining whether the code signal is a non-subscriber use code when a predetermined code signal is received from an arbitrary subscriber, and inputting an arbitrary service subscriber number if the code signal is a non-subscriber use code. After waiting for the service subscriber number input step and any service subscriber number is input, if the incoming call transfer service setting code is input, the existing target subscriber number corresponding to the service subscriber number is entered. In addition to updating the service, the corresponding call forwarding service is set, and when the incoming call forwarding service release code is inputted, the service removes the existing target subscriber number corresponding to the service subscriber number and releases the corresponding call forwarding service. Characterized in that it comprises a setting or release step.

Description

How to set up and release call forwarding service in satellite communication system

The present invention relates to a communication system using satellite, and in particular, in a satellite communication system that enables to set or release an automatic call transfer service (CTX) using not only its own phone but also another subscriber's phone. The present invention relates to a method for setting and canceling an incoming call transfer service.

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.

In Figure 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, 3 (3A, 3B) is a public switched network (11A, 11B) or telephone (12A, 12B) Communication function between the various terminals through data transmission and reception with the central control station 2 as well as an interface function for terminals such as data terminals 13A and 13B and facsimile 14A and 14B, such as a computer. The base station that provides.

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 configuration, in the normal state, the central control station 2 transmits the control message through the service channel S, and then, based on the response message transmitted from the base station 3, states of each base station 3. That is, it performs a polling function to check the availability of the communication capacity or 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.

In addition, the central control station (2) provides an incoming call switching service for automatically switching the incoming call to the subscriber inside the system. That is, when a call request signal is generated for a subscriber (hereinafter referred to as a service subscriber) registered in an automatic call forwarding service, a called subscriber to which the incoming call is transferred, for example, set by the service subscriber (hereinafter referred to as a target subscriber) On the basis of the telephone number for the base station (3) by allocating a communication channel and communication modem available to provide a call forwarding service.

On the other hand, the subscriber in the system must perform the call transfer service registration and setup process in order to receive the call forwarding service function. That is, when the subscriber applies for call transfer service registration, the system operator registers by storing predetermined subscriber information in a memory of a predetermined space, and the service subscriber receives the call transfer service function, for example, the phone number of the target subscriber. By using the user's phone to set the call transfer service can be provided.

When the target subscriber is set by the service subscriber, the central control station 2 sends a call request signal to the target subscriber side without generating a call request signal to the service subscriber side when a call request signal is generated for the service subscriber. By doing so, the call forwarding service is executed.

However, in the existing incoming call transfer service as described above, in order for a service subscriber A to transfer a call, only the incoming call transfer service is set up using his own phone, which is the service subscriber A. When a subscriber is provided with a call forwarding service through a subscriber B's telephone and is moved to a place and needs to change the target subscriber, the subscriber A goes back to where his telephone is. Using the phone, there is a troublesome problem of releasing the number of the existing target subscriber B for which the call transfer is set and registering the new subscriber's number as the target subscriber.

In addition, if the service subscriber A postpones the above-mentioned release and setting operations, the target subscriber side B has a problem of continuously receiving a call called by the service subscriber A.

Accordingly, the present invention has been made in view of the above circumstances, and the incoming call transfer service in the satellite communication system that enables the user to set up or release the automatic call forwarding service using not only his own phone but also another subscriber's phone. The purpose is to provide a setting and release method.

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

2 is a block diagram showing the configuration of a central control station to which a method of setting and releasing an incoming call transfer service in a satellite communication system according to an embodiment of the present invention;

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

4 is a flowchart illustrating a method for setting and releasing an incoming call transfer service 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: Public switched network

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: network control unit

50: network management device 31: processor

32: Service Channel Controller (SCC) 33: Dual Port RAM (DP-RAM)

34: program storage unit 35: base station information storage unit

36: subscriber information storage 37: code comparison

38: service subscriber information storage unit 39: target subscriber information storage unit

40: service status information storage unit

In the satellite communication system according to the present invention for achieving the above object, a method for setting and releasing a call forwarding service is provided to a satellite communication system that provides a call forwarding function by combining a plurality of base stations respectively coupled with a plurality of subscribers through satellites. In; A non-subscriber use code determination step of determining whether the code signal is a non-subscriber use code when a predetermined code signal is received from an arbitrary subscriber, and inputting an arbitrary service subscriber number if the code signal is a non-subscriber use code. After waiting for the service subscriber number input step and any service subscriber number is input, if the incoming call transfer service setting code is input, the existing target subscriber number corresponding to the service subscriber number is entered. In addition to updating the service, the corresponding call forwarding service is set, and when the incoming call forwarding service release code is inputted, the service removes the existing target subscriber number corresponding to the service subscriber number and releases the corresponding call forwarding service. Characterized in that it comprises a setting or release step.

That is, according to the above, it is possible to register and release the call transfer service using a phone other than its own phone, so that the incoming call transfer service can be provided very conveniently.

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

2 is a block diagram illustrating a configuration of a central control station to which a method of setting and releasing an incoming call transfer service is applied in a satellite communication system according to an embodiment of the present invention.

In the drawing, reference numeral 21 denotes an antenna for transmitting and receiving satellite 1, an uplink signal, and a downlink signal, and 22 denotes an antenna for transmitting and receiving through the antenna 21 by using a polarization property of frequency. An Orthogonal Mode Transducer for separating and inputting and outputting a signal, and a Low Noise Amplifier for low noise amplifying a downlink frequency signal of 12.25 to 12.75 GHz input through the Orthogonal Mode Transducer, A down converter for converting a frequency signal applied through a low noise amplifier into, for example, an intermediate frequency signal IF of 70 MHz, and an IF of 70 MHz applied from an IF combination / distributor 23 to be described later. An up-converter for converting a signal into microwaves of 14.0 to 14.5 GHz to generate an uplink frequency signal, and an uplink frequency signal output from the frequency-up converter An RF processor configured to include a high power amplifier (High Power Amplifier) for amplifying.

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 is a network control unit to demodulate and decode and output the intermediate frequency signal applied from the IF combination distribution unit 23, which will be described later SCPC channel unit that encodes, modulates and outputs the message output from (30).

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

Reference numeral 30 denotes each base station based on a response message transmitted from the base station 3 after sending the control message to each base station 3 through a predetermined SCPC channel unit 24 for transmitting and receiving the control message. Perform a polling function to check the state of (3), and if there is a call request from a specific base station, determine whether the other base station is in a communication capable state based on the information obtained in the polling process. In this case, the network control unit performs system control, such as by allocating an available traffic channel T of a satellite and a modem to both base stations 3 so that both base stations can directly communicate with each other.

In addition, when the call request signal is generated for the service subscriber, the network controller 30 not only controls to execute the automatic call forwarding service function by switching the call request signal to the target subscriber set by the service subscriber. In changing the setting state or release state of the incoming call forwarding service, the setting state or release state of the incoming call forwarding service provided to other service subscribers other than setting or canceling the incoming call forwarding service for the own phone is changed. For example, when a non-subscriber use code is received, it controls the operation of setting or releasing an incoming call transfer service for a series of non-subscribers.

In addition, reference numeral 50 is a network management apparatus for the system administrator to manage the network control unit 30 to manage the overall network of the satellite communication system.

The reference code MPH (Main PCM Highway) is a data bus through which information data such as voice signals or data signals are transmitted and received, and the UPH (Utility PCM Highway) is a control bus through which control data is transmitted and received between the network controller 30 and each device. to be.

3 is a block diagram showing the configuration of the network controller 30 described above.

In the figure, reference numeral 31 denotes a processor for controlling the whole system, and in particular, the processor 31 periodically performs polling operations for all base stations 3 and performs a series of control related to an automatic call forwarding service. 32 is to generate the S-ALOHA packet by extracting the packet information from the message applied from the SCPC channel unit 24, and generates and outputs a message of the TDM stream to the SCPC channel unit 24 Service Channel Controller.

Further, reference numeral 33 denotes a dual port RAM, which is provided for data transmission and reception between the processor 31 and the service channel controller 32.

Further, reference numeral 34 denotes a program storage unit for storing the operation program of the processor 31, and reference numeral 35 denotes status information of each base station obtained by the polling operation of the processor 31, and a communication channel allowed by the current satellite. A base station information storage unit for storing information such as the use state, and the modem use state of the base station 3, 36 is a subscriber information storage unit for storing predetermined subscriber information for all subscribers subscribed to the system, 37 is the processor According to the control signal of (31), it is a code comparing unit which compares whether or not a series of code data matches predetermined reference data (e.g., non-subscriber use code) and outputs the resultant signal.

Reference numeral 38 denotes a service subscriber information storage unit for storing predetermined subscriber information for a subscriber registered in an automatic call forwarding service, and 39 denotes predetermined subscriber information for a target subscriber designated by an arbitrary service subscriber. The target subscriber information storage unit 40, which is stored, is a service state information storage unit for storing predetermined flag data on a setting state or a release state of an automatic incoming call transfer service input from a subscriber, and the processor 31 is provided with a service subscriber. If the target subscriber is set by, for example, 1, the target subscriber is not set or released state, for example, by recording the stored data of the service state information storage unit 40 to 0, the operation of the incoming call switching service It holds state.

Next, the present invention will be described in more detail with reference to the flowchart of FIG. 4.

First, in order to receive the call forwarding service currently, the subscriber must set the subscriber's telephone number as the target subscriber. When the subscriber is set by the subscriber, the processor 31 of the central control station 2 ) Stores the telephone number of the target subscriber in the target subscriber information storage 39 and sets the recorded data of the service state information storage 40 to a predetermined call forwarding service setting state (1). Thereafter, when a predetermined call request signal for the service subscriber is input from any subscriber, the incoming call is switched to the corresponding subscriber, and a series of call processing operations are performed.

On the other hand, when a predetermined code signal is input from any subscriber (service subscriber or general subscriber), the processor 31 controls the code comparison unit 37 based on the input code signal. At this time, when a predetermined result signal corresponding to the matching of the code signal with a predetermined non-subscriber use code is input from the code comparing unit 37, the processor 31 performs an incoming call transfer service that does not use its own telephone. Recognizing that it is in the set or released state, and then waits for the input of the subscriber number input by the subscriber. (ST1, ST2 step)

Subsequently, when the subscriber number has been received (step ST3), the processor 31 searches for the subscriber information storage unit 36 and the service subscriber information storage unit 38 based on the subscriber number and the subscriber number is stored. It is determined whether the subscriber number existing in the system and the subscriber number registered in the call transfer service (ST4, ST5).

At this time, if the subscriber number is not registered in the incoming call transfer service, the processor 31 performs a call release process control for the call received from the calling party (ST6 step).

However, when the subscriber number is registered in the incoming call transfer service in step ST5, the processor 31 waits to receive a predetermined code signal from the calling party (ST7 step). When a predetermined code signal for setting up an incoming call transfer service is received (step ST8), the processor 31 then searches the subscriber information storage unit 36 based on the target subscriber number input from the calling subscriber. It is determined whether the target subscriber number is a subscriber number existing in the system (steps ST9 and ST10).

Subsequently, when the target subscriber number is a subscriber number existing in the system, the processor 31 sets the recorded data of the service state information storage unit 40 to, for example, 1 and the target subscriber input from the calling subscriber. By controlling the number, the corresponding area of the target subscriber information storage 39 corresponding to the service subscriber input by the calling subscriber is updated and stored (step ST11). Then, the processor 31 is controlled to release the call set by the calling party (ST12 step).

On the other hand, when a predetermined release code signal for the incoming call transfer service is received from the calling party in step ST7 (step ST13), the processor 31 the service state information corresponding to the service subscriber input from the calling party. By setting the recorded data (currently 1) of the corresponding area of the storage unit 40 to 0, for example, the terminating call transfer service is released, and then the call set for the calling party is released (step ST14).

When a predetermined code signal (including an error code signal) excluding the incoming call transfer service setting code signal or a release code signal is received from the calling party in step ST7 (step ST15), the processor 31 The control immediately proceeds to step ST12 to release the call established by the calling party.

Therefore, according to the above embodiment, the service subscriber registered in the incoming call transfer service can release or set the incoming call transfer service set by the user using a phone other than his own phone. Receive call transfer service.

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, a call forwarding service is set up and released in a satellite communication system that allows a service subscriber to set up or cancel an automatic call forwarding service using his or her own phone as well as another subscriber's phone. The method can be realized.

Claims (1)

A satellite communication system for providing an incoming call switching function by combining a plurality of base stations, each of which is combined with a plurality of subscribers, through satellites; A non-subscriber use code determination step of determining whether the code signal is a non-subscriber use code when a predetermined code signal is received from any subscriber; A service subscriber number input waiting step of waiting for input of any service subscriber number when the code signal becomes a non-subscriber use code; After any service subscriber number is input, if the incoming call forwarding service setting code is input, the target subscriber number to be input is then updated to update the existing target subscriber number corresponding to the service subscriber number and to perform the corresponding call forwarding service. And setting a service setting or releasing service when the incoming call transfer service release code is input, deleting the existing target subscriber number corresponding to the service subscriber number, and releasing the corresponding call transfer service. How to set up and release call forwarding service in satellite communication system.