KR19990062298A - Satellite communication system with bad channel modem notification - Google Patents

Abstract

According to the present invention, when the call modem is not established because the channel modem provided in the base station is bad, when the channel modem selected by the central station is not connected more than a predetermined number of times, the central station receives information on the channel modem. The present invention relates to a satellite communication system having a bad channel modem notification function that allows an operator to take an action, and provides a communication function between subscribers by combining a plurality of base stations, each of which is combined with a plurality of subscribers, through a satellite. A satellite communication system comprising: a channel modem information storage unit for storing subscriber information and channel modem information read from a call setup information data string transmitted from a central station, a timer for generating time data based on a predetermined control signal, and a failure A guide message storage unit for storing guide messages regarding a channel modem, When the transponder channel and channel modem allocation is performed in response to a call request from the base station, the base station controller reads and stores the assigned channel modem information and subscriber information and checks the subscriber status after a predetermined time. In this case, when the call connection is not established, the processor may search for the number of error times of the channel modem, and if the predetermined number or more is included, the processor may control to send a message regarding the bad channel modem to the central station.

Description

Satellite communication system with bad channel modem notification

The present invention relates to a communication system using satellite, and in particular, when a call setup is not made because the channel modem provided in the base station is bad, the channel modem selected for call setup at the central station is not connected more than a predetermined number of times. The present invention relates to a satellite communication system having a bad channel modem notification function that allows the operator to take action by transmitting information about the channel modem to a central station.

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 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 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 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 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 signal of 70 MHz applied from an IF combination distribution unit 23 to be described later. Is an upconverter for generating an uplink frequency signal by converting the microwave into a microwave of 14.0 to 14.5GHz, and an uplink frequency signal output from the frequency upconverter. 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. 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 the message is transmitted, the base station controller 30 generates a message of the TDM stream and outputs it to the SCPC channel unit 24. The TDM message is encoded and modulated. After being converted into an uplink frequency signal, the antenna 21 is output to the satellite 1.

On the other hand, the central station allocates a channel modem and a transponder channel when a call is requested from the base station. By assigning a channel modem that is not currently in use, the communication path between both base stations is established.

However, in the channel modem allocation, the central station does not recognize whether the channel modem on the base station side is bad and allocates the bad channel modem to the base station together with the transponder channel. The problem is that the call path is broken.

Accordingly, the present invention was created in view of the above circumstances, and when it is determined that the call connection using the 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 channel modem information as a central station. It is an object of the present invention to provide a satellite communication system having a bad channel modem notification function by allowing the system operator to take 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 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), 30,100: 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 unit,

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

107: timer, 108: information message storage.

The satellite communication system having a bad channel modem notification function according to the present invention for achieving the above object, in the satellite communication system for providing a communication function between subscribers by combining a plurality of base stations, each of which is combined with a plurality of subscribers through satellites. , A channel modem information storage unit for storing subscriber information and channel modem information read from a call setup information data string transmitted from a central station, a timer for generating time data based on a predetermined control signal, and a guide for a bad channel modem. The message storage unit for storing the message and the transponder channel and channel modem assignment according to the call request from the base station in the central station are read out and stored in the channel modem information and subscriber information allocated by the base station controller. In addition, after a predetermined time passes, the subscriber's status is checked. If the control did not enable is set, if the search for the error count for that channel modem day given once or more, and a processor for controlling messages on a bad channel modem to transmit to the central station is characterized in that configured.

That is, according to the present invention having the above-described configuration, when the transponder channel and channel modem assignment 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. In addition, after a predetermined time, the subscriber status is checked to determine whether the call is established. If the call connection is not established, the error frequency of the channel modem is checked, and if there is an abnormality in the channel modem more than a predetermined time, the bad channel is established. A message about the modem is sent to the central station.

Therefore, the system operator of the central station can take measures such as not setting a bad channel modem together when assigning channels.

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 has been received. When the call setup information data allocated from the central station is received (ST1), the microprocessor 101 receives a subscriber from the received data sequence. The information and the channel modem information are 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. Read the information to check the subscriber status information set in the subscriber status information storage unit 105 (ST4), where the timer 107 is a call connection is made and the subscriber status information of the telephone data card 40 is the base station controller ( Time data until storing in the subscriber state information storage unit 105 of 100) is generated.

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 to the subscriber state information storage unit 105 or not. (ST5).

Subsequently, when it is determined that the call connection is not established at 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 information data on the corresponding channel modem among the data stored in the channel modem information storage unit 106 (ST8).

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.

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, it checks the subscriber status and determines whether to set up a call. If the call connection is not established, the channel modem error count is checked. Will be sent to the central station.

Therefore, the system operator of the central station can take measures such as replacing the channel modem of the 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)

In the satellite communication system for providing a communication function between subscribers by combining a plurality of base stations, each of which is combined with a plurality of subscribers through a satellite, A channel modem information storage unit for storing subscriber information and channel modem information read from a call setup information data string transmitted from a central station; A timer for generating time data based on a predetermined control signal, A guide message storage unit for storing guide messages regarding a bad channel modem, When the central station performs the transponder channel and channel modem assignment according to the call request from the base station, the base station controller reads and stores the allocated channel modem information and subscriber information, and confirms the subscriber status after a predetermined time. In this case, if the call connection is not established, the processor detects the error frequency of the channel modem, and if more than a predetermined number of times, comprising a processor for controlling to send a message about the bad channel modem to the central station. Satellite communication system with channel modem notification.