KR100222265B1 - Overload control method based on charging information in satellite communication system - Google Patents

Abstract

The present invention changes the state of the system when the billing information transmitted from each base station is stored over a certain number, and performs satellite selective call processing for subsequent call requests, thereby preventing overload of the system. An overload control method based on charging information in a communication system, comprising: a satellite communication system providing a communication function of a subscriber by combining a plurality of base stations coupled with a plurality of subscribers through a satellite; A threshold setting step of setting a system state class corresponding to a charging information storage threshold when the system is started, charging information receiving and storing step of storing the charging information from a base station in a predetermined memory, and storing the charging information stored in the memory. And a dependent call processing step of controlling call processing based on the current number retrieved in the charging information number retrieving step;

Description

Overload control method based on charging information in satellite communication system

The present invention relates to a communication system using a satellite, and in particular, if the billing information transmitted from each base station is stored more than a predetermined number, the state of the system is changed, and subsequent call requests are arbitrarily performed by performing selective call processing. The present invention relates to an overload control method based on charging information in a satellite communication system capable of preventing an overload of a system.

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.

2 is a block diagram showing the configuration of the central control station 2 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 is a network controller 30 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 network control unit 30 and outputting 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.

In addition, reference numeral 30 denotes a network controller for controlling the overall system, which transmits a control message to each base station 3 through an arbitrary SCPC channel unit 24 and sends a response message transmitted from the corresponding base station. On the basis of this, the polling function of checking the state of each base station 3 is performed. When there is a call request from a specific base station 3, it is determined whether the counterpart base station 3 is in a communication enabled state based on the information obtained in the polling process. By assigning the available traffic channels T and modems of the two base stations 3, the two base stations 3 can directly communicate with each other.

In addition, the network controller 30 stores the charging information transmitted together with the predetermined call cancellation message from the base station 3 in a predetermined memory, and then requests the predetermined charging information from the network management apparatus 40 to be described later. The charging information is transmitted to the network management device 40 according to the message. On the other hand, the number of the billing information that can be stored in the memory is set to the threshold value when the system is initialized.

In addition, reference numeral 40 denotes a network management apparatus for allowing a system operator to manage an overall satellite communication system using a predetermined operator terminal.

That is, in the satellite communication system having the above-described configuration, the network controller 30 periodically polls to check the state of each base station to hold state information of each base station 3 and from the base station 3. Based on the required call request message, an arbitrary communication channel is allocated to provide a communication function between subscribers.

On the other hand, when the subscriber terminates the call, the base station 3 immediately transmits a predetermined call cancellation message to the network controller 30. At this time, the network controller 30 detects the charging information from the call cancellation message. After storing in a predetermined memory (maximum 200 billing information as described above), when the predetermined billing information transmission request signal is input from the network management device 40, the billing information is read from the memory and the network management device 40 Will be printed.

By the way, in general, while the communication channel and communication modem provided in the communication system using the satellite (1) is limited, the number of subscribers who want to use this system is relatively large.

Thus, as described above, when the subscriber terminates the call, the base station 3 immediately transmits the billing information to the network controller 30 through the traffic channel T at the same time. If the predetermined memory for storing the billing information is filled at 30, there is a problem that the billing information cannot be held because the storage space is insufficient. In addition, an overload of the system may cause a malfunction of the system or may cause system down.

Therefore, it is desirable to be able to use only a small number of subscribers rather than all the subscribers not using them for a certain period of time due to excessive load on the system. Therefore, it is necessary to take sanction means for a newly generated call, such as forcibly defining the status level of the system based on the charging information currently stored in the network control unit 30.

Accordingly, the present invention was created in view of the above circumstances, and when the billing information transmitted from each base station is stored over a certain number, the state of the system is changed, and the subsequent call request is arbitrarily selected. The purpose of the present invention is to provide an overload control method based on charging information in a satellite communication system that can prevent overload of the system.

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 central control station 2 in FIG.

FIG. 3 is a block diagram illustrating a hardware configuration of an overload control method based on charging information in a satellite communication system according to an embodiment of the present invention. FIG.

Figure 4 is a block diagram for explaining an overload control method based on charging information 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: Network Control Unit

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

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

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

37: billing information storage counter 40: network management device

In the satellite communication system according to the present invention for realizing the above object, an overload control method based on charging information is provided in a satellite communication system which provides a communication function of a subscriber by combining a plurality of base stations respectively coupled with a plurality of subscribers through a satellite. ; A threshold setting step of setting a system state class corresponding to a charging information storage threshold when the system is started, charging information receiving and storing step of storing the charging information from a base station in a predetermined memory, and storing the charging information stored in the memory. And a dependent call processing step of controlling call processing based on the current number retrieved in the charging information number retrieving step;

That is, according to the above configuration, the state class of the system is adjusted by comparing the number of billing information transmitted and stored from the base station with the threshold set when the system is started, and in the subsequent call based on the system state class, By limiting any call, the system can be prevented from being overloaded.

On the other hand, Figure 3 is a block diagram for explaining the hardware in the overload control method based on the charging information in the satellite communication system according to an embodiment of the present invention.

In the drawing, reference numeral 31 is a processor for performing overall control of the network controller 30, 32 is a dual port RAM provided for data transmission and reception between the processor 31 and the service channel controller 33 to be described later; 33 generates a S-ALOHA packet by extracting packet information from the message applied from the SCPC channel unit 24, and generates and outputs a message of a TDM stream to the SCPC channel unit 24. (Service Channel Controller).

In addition, 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 current state information of the system with a predetermined flag, 36 is from the base station (3) A billing information storage unit for storing the billing information transmitted, 37 is a billing information storage counter for counting the number of billing information stored in the billing information storage unit 36 on the basis of the control signal of the processor 31. .

Here, the processor 31 is based on the number stored in the billing information storage 36, for example, "Normal", "Pre-Overload", "Overload (Overload) The system status is set to three levels. For example, when the number of billing information stored in the billing information storage unit 36 reaches a threshold (approximately 80% of the threshold), the current system state is set to an overload state and then transmitted from the base station 3. Random call is randomly extracted for the call request signal to be controlled to perform a series of call processing on the extracted call. In other words, an arbitrary call is selectively processed among a plurality of simultaneous call requests, and other call request signals are ignored.

Next, an overload control method based on charging information in the satellite communication system according to an embodiment of the present invention will be described using the flowchart of FIG. 4.

First, when the system is first started, the processor 31 sets a system state class corresponding to the charging information storage threshold. For example, after setting the maximum billing information storage threshold (100%) that can be stored in the billing information storage unit 36, if the billing information is stored 80% for this maximum storage threshold value, the system status class is overloaded, If charging information is saved 50% of the maximum storage threshold, the system status class is set to pre_overload. For example, if the number of billing information stored in the current billing information storage 36 is 70% of the maximum storage threshold value, the processor 31 sets the status level of the current system to the pre_overload state.

In the state of normal call processing after the system is started, when the charging information message is received from the base station 3 together with the predetermined call cancellation message (step ST401), the service channel controller 33 extracts the predetermined packet information. To be output to the processor 31. Then, the processor 31 extracts the charging information from the packet information input from the service channel controller 33 and stores the charging information in the charging information storage unit 36 (step ST402).

In addition, the processor 31 stores the charging information and controls to drive the charging information storage counter 37 to count the storage number of the charging information (step ST403).

In addition, the processor 31 sets the state class of the current system based on the counter count value of the charging information storage counter 37 and controls the call processing. For example, if the number of billing information currently stored in the billing information storage 36 maintains 70% of the maximum storage threshold, the processor 31 sets the current system state to the pre_overload state. . Then, when call request messages are received from a plurality of base stations 3, a call is selected from a plurality of call request signals to control call processing only for the corresponding call.

That is, the processor 31 continuously searches the count value of the billing information storage counter 37. As a result of the search, when the number of storage of the current billing information corresponds to 70% of the maximum storage threshold value, the processor 31 displays the current state of the system. The pre_overload state is set, and call processing is selectively controlled for subsequent call request messages (steps ST404 to 406). At this time, the processor 31 transmits the changed state information of the system to each base station (3).

When the count value of the billing information storage counter 37 reaches or exceeds 80% of the maximum storage threshold value, the processor 31 sets the current state of the system to an overload state, and then receives a request request message. The call processing is controlled more restrictively than the arbitrary call processing in the pre_overload state (steps ST407 to 409). At this time, the processor 31 transmits the changed state information of the system to each base station (3).

Thereafter, the processor 31 normally controls the call processing when the count value of the billing information storage counter 37 becomes lower than a predetermined value.

That is, according to the above embodiment, the state class of the system is adjusted by comparing the number of billing information transmitted and stored from the base station with the threshold set when the system is started, and in the subsequent call based on the system state class, By limiting any call, the system can be prevented from being overloaded.

In addition, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the technical gist of the present invention.

As described above, according to the present invention, if the billing information transmitted from each base station is stored more than a certain number, the state of the system is changed, and the subsequent call request is arbitrarily performed to selectively overload the system. The overload control method based on the charging information can be realized in the satellite communication system that can be prevented.

Claims (1)

A satellite communication system for providing a communication function of a subscriber by combining a plurality of base stations, each of which is combined with a plurality of subscribers through a satellite; A threshold setting step of setting a system status class corresponding to the charging information storage threshold at system startup; Charging information receiving and storing step of storing the charging information from the base station in a predetermined memory; A billing information storage number searching step of searching for the number of billing information stored in the memory; And a subordinate call processing step of controlling call processing based on the current number retrieved in the billing information number searching step.