KR100300101B1 - Satellite communication system having defective channel modem announcing function - Google Patents

Abstract

PURPOSE: A satellite communication system having a defective channel modem announcing function is provided to allow a system operator to easily operate and manage a system by transferring defective state information on a channel modem to a central station if a call set-up between subscribers is not made for certain times through the channel modem allocated for the call set-up from the central station. CONSTITUTION: A processor(51) controls the overall system. A SCC(Service Channel Controller) extracts packet information from a message applied from an SCPC channel unit and generates an S-ALOHA packet, and generates a message of TDM stream for the SCPC channel unit and outputs it. A dual port RAM(53) transmits and receives a data between the processor(51) and the SSC(52). A program storing unit(54) stores an operation program of the processor(51). A subscriber state information storing unit(55) stores scriber state information, such as an idle state, a lock-out state and a busy state of a subscriber telephone set, received from a telephone data card. A channel modem information storing unit(56) stores subscriber information and channel modem information read from a call set-up information data stream transmitted from a central station. A timer(57) generates a time data on the basis of a control signal. An announcement message storing unit(58) stores an announcement message on a defective channel modem.

Description

Satellite communication system with bad channel modem notification

The present invention relates to a communication system using satellites, and in particular, when a call setup between subscribers is not made more than a predetermined time through a channel modem allocated by a central station for call setup, the state information of the channel modem is transmitted to the central station. By doing so, the present invention relates to a satellite communication system having a bad channel modem notification function that enables the system operator to facilitate the operation and management of the 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.

1 is a configuration diagram showing an 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 arrangement, the central control station 2 transmits a control message through the service channel S and then communicates the state of each base station 3 based on a response message transmitted from the base station 3. 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 the 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 receives 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 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. Orthogonal Mode Transducer that separates and inputs and outputs a signal, and Low Noise Amplifier, which low-amplifies 12.25 to 12.75 GHz downlink frequency signal inputted through the Orthogonal Mode Converter, the low noise amplifier A down converter for converting a frequency signal applied through an amplifier, for example, into an intermediate frequency signal IF of 70 MHz, for example, an IF signal of 70 MHz applied from the 1F combination distribution unit 23 to be described later. An up-converter (up converter) for generating an uplink frequency signal by converting to microwaves of ˜14.5 GHz and an uplink frequency signal output from the up-converter An RF processor configured to include a high power amplifier (High Power Amplifier) to width.

In addition, the 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. An IF combiner divider (Combiner / Distributer) for combining and outputting the intermediate frequency signal, 24 is a base station control unit to demodulate and decode and output the intermediate frequency signal applied from the IF combination divider 23, which will be described later SCPC channel unit that encodes, modulates and outputs messages output from (30).

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 indicates a call request from the subscriber to the central control station 2 to perform communication between the subscribers based on the communication channel and communication modem allocated from the central control station 2. A base station control unit that performs overall control as well as a control box, 40 is a telephone data card for connecting a plurality of analog or data subscribers simultaneously, and 50 is a connection with a public switched network (PSTN) of a land network. Trunk Interface Port that performs functions.

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

In the above configuration, the downlink frequency signal received from the central control station 2 through the antenna 21 is applied to the SCPC channel unit 24 through the RF processor 22 and the IF combination divider 23 and demodulated. And decoded to be applied to the base station controller 30, and when transmitting a message, the base station controller 30 converts the TDM message into an uplink frequency signal after being encoded and modulated, and outputs it to the satellite 1 via the antenna 21. To be.

On the other hand, since the central station allocates a channel modem and a transponder channel when a call is requested from the base station, a communication channel between both base stations is established by allocating an effective channel modem that is not currently in use when allocating the channel modem of the base station.

However, in the channel modem assignment, if the central station allocates the bad channel modem to the base station together with the transponder channel without recognizing whether the channel modem of the base station is bad, the call is not properly connected and the call continues. A problem occurs that is cut off.

Accordingly, the present invention was created in view of the above circumstances, and when it is determined that a call connection using a channel modem allocated during call setup is not made more than a predetermined time, the channel modem is in a bad state together with the corresponding channel modem information to the central station. It is an object of the present invention to provide a satellite communication system having a bad channel modem notification function that enables the system operator to facilitate the operation and management of the system, such as taking action to operate the system in consideration of this.

1 is a block diagram showing a schematic configuration of a general satellite communication system.

FIG. 2 is a block diagram showing the internal structure of the base station 3 of FIG.

Figure 3 is a block diagram showing the internal configuration of the base station controller 50 in the satellite communication system according to an embodiment of the present invention.

FIG. 4 is an operation flowchart for explaining the operation of the apparatus in the configuration of FIG.

* Explanation of symbols for main parts of the drawings

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, 100: base station control unit

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

101: processor 102: service channel controller (SCC)

103: Dual Port RAM 104: Program Storage

105: subscriber status information storage unit 106: channel modem information storage unit

107: Timer 108: Information message storage.

Satellite communication system having a bad channel modem notification function according to the present invention for achieving the above object is, a plurality of base stations, each of which is combined with a plurality of subscribers is configured by combining with a central station via satellite, the operator is provided from the central station In the satellite communication system to operate and manage the system based on the information, wherein the central station allocates a predetermined effective channel modem to the call setup requesting subscriber to perform the inter-subscriber communication through the channel modem, wherein the base station is the central station. A channel modem information storage unit for storing subscriber information and channel modem information read from the call setup information data transmitted from the system, a timer for generating time data based on a predetermined control signal, and a guide message for a bad channel modem. Information message storage unit, and assigned to the central station according to the call setup request In addition, the modem information is stored in the channel modem information storage unit so as to correspond to the subscriber information. In addition, the timer is driven so that the subscriber state after a predetermined time elapses is not connected to a call and the number of errors for the channel modem is small. And a processor configured to control the guide message storage unit to read the bad channel modem message and transmit the bad channel modem message to the central station, wherein the central station provides the system operator with the bad channel modem information applied from the base station. It is characterized by.

That is, according to the present invention having the above-described configuration, by monitoring a channel modem in which call disconnection occurs more than a predetermined number of times, and sending a bad channel modem message to the central station, the system operator of the central station replaces the channel modem of the corresponding base station. Not only can you take action, but you can also regulate the channel modem's configuration of the central station to refrain from using the modem until the channel modem is replaced, thus preventing other call breaks in the bad channel modem configuration.

Therefore, it is possible to efficiently operate and manage the system such that the system operator of the central station does not set a bad channel modem upon channel assignment.

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

Figure 3 is a block diagram showing the internal configuration of the base station controller 100 in the satellite communication system according to an embodiment of the present invention.

In the figure, reference numeral 101 denotes a processor for controlling the entire system, 102 extracts packet information from a message applied from the SCPC channel unit 24 to generate an S-ALOHA packet, and the SCPC channel unit 24. It is a service channel controller that generates and outputs a message of a TDM stream.

Reference numeral 103 denotes a dual port RAM, which is provided for data transmission and reception between the processor 101 and the service channel controller 32.

In addition, reference numeral 104 denotes a program storage unit for storing an operation program of the processor 31, and 105 denotes, for example, an idle state and a lock-out of a subscriber telephone received from the telephone data card 40. It is a subscriber state information storage unit that stores subscriber state information such as out state and busy state.

Also, reference numeral 106 is a channel modem information storage unit for storing subscriber information and channel modem information read out from the call setup information data string transmitted from the central station, and 107 is a timer for generating time data based on a predetermined control signal. 108 is a guide message storage unit for storing guide messages regarding a bad channel modem.

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

First, when there is a call request from a subscriber bound to a base station, it transmits it to the central station. The central station checks the state of the subscriber to be called and uses it for each base station to which both subscribers are bound when idle. Transponder channel and channel modem information is transmitted.

On the other hand, the base station determines whether the call setup information data transmitted from the central station is received. When the call setup information data allocated from the central station is received (ST1), the processor 101 receives the subscriber information from the received data sequence. And the channel modem information is read out and stored in the channel modem information storage unit 106. (ST2)

Subsequently, the processor 101 determines whether a predetermined time has elapsed by driving the timer 107 (ST3). When the predetermined time has elapsed, the processor 101 stores the subscriber stored in the channel modem information storage unit 106. The information is read to confirm the subscriber status information set in the subscriber status information storage 105 (ST4).

At this time, the subscriber status information indicates the call setup state between subscribers, the timer 107 is a call connection is made and the subscriber status information of the telephone data card 40 is stored in the subscriber status information storage unit of the base station controller 100 ( It generates time data until it is stored in 105).

In addition, the processor 101 determines whether the subscriber stored in the channel modem information storage unit 106 is set to the call connection state with the subscriber state information storage unit 105 or not. (ST5).

Subsequently, when it is determined that the call connection is not established in step ST5, the processor 101 determines how many corresponding channel modems are stored in the channel modem information storage unit 106 (ST6). If it is determined that the predetermined number of times is stored, the processor 101 reads a message about the bad channel modem information from the guide message storage unit 108 and transmits the message to the central station through the SCPC channel unit 24 together with the corresponding channel modem information. (ST7).

Thereafter, the processor 101 deletes and returns the information data about the channel modem, that is, the channel modem information set for the subscriber, among the data stored in the channel modem information storage unit 106 (ST8).

In addition, the central station provides the system operator who operates and manages the system with the defect status information of the corresponding channel modem. That is, the system operator can search and confirm the state of the channel modem through an operator terminal (not shown) combined with the central station.

On the other hand, if the subscriber stored in the channel modem information storage unit 106 is set to call connection to the subscriber state information storage unit 105 in step ST5, the processor 101 is the channel modem information storage unit 106 In step ST8, the corresponding channel modem information is deleted.

In addition, if it is determined in step ST6 that the number of abnormal detections of the corresponding channel modem is less than a predetermined value, the processor 101 increases the number of abnormal detections of the corresponding channel modem by "1".

That is, according to the embodiment, when the transponder channel and channel modem allocation is performed according to the call request from the base station in the central station, the base station controller reads and stores the assigned channel modem information and subscriber information, and the predetermined time, After this, the subscriber status is checked to determine whether the call is established. If the call connection is not established, if the channel modem error occurs more than a predetermined number of times, the channel modem is defective. The status message will be sent to the central station.

Therefore, the system operator coupled to the central station and managing the overall operation of the system can easily perform the operation and management of the system by taking measures such as replacing the channel modem of the corresponding base station.

In addition, by restricting the channel modem setting of the central station to refrain from using the modem until the channel modem is replaced, it is possible to prevent a call drop due to a bad channel modem setting.

Meanwhile, the present invention is not limited to the above embodiments and can be variously modified within the scope not departing from the technical gist of the present invention.

As described above, according to the present invention, by monitoring the channel modem in which call disconnection occurs more than a predetermined number of times, and sending a bad channel modem message to the central station, the system operator of the central station replaces the channel modem of the corresponding base station. Not only can this be done, but by restricting the channel modem settings of the central station to refrain from using the modem until the channel modem is replaced, it is possible to prevent call breakage due to bad channel modem settings.

Claims (1)

(Correction) A plurality of base stations, each of which is combined with a plurality of subscribers, is configured to be combined with a central station through satellite, and an operator operates and manages the system based on information provided from the central station, and the central station is a call setup requesting subscriber. A satellite communication system for allocating a predetermined effective channel modem to a subscriber to perform communication between subscribers via the channel modem, wherein the base station stores subscriber information and channel modem information read from call setup information data transmitted from a central station. A channel modem information storage unit, a timer for generating time data based on a predetermined control signal, a guide message storage unit for storing a guide message about a bad channel modem, and a channel modem assigned by the central station according to a call setup request. In addition to storing the information in the channel modem information storage unit to correspond to the subscriber information If the subscriber state after the predetermined time elapses by the timer is not connected to the call and the number of errors for the channel modem is greater than or equal to a predetermined value, the message storage unit reads a bad channel modem message and reads the bad channel modem message. And a processor for controlling transmission to the mobile station, wherein the central station is configured to provide a system operator with the bad channel modem information applied from the base station.

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