KR19990048231A - Relay line initialization method in satellite communication system - Google Patents

Abstract

The present invention is a satellite that provides a stable service to subscribers by initializing the trunk by transmitting a predetermined initialization signal to the public switched network when the public network matching device is inoperable and is restored to normal after abnormal termination with the public switched network. A relay line initialization method in a communication system, comprising: a plurality of base stations directly coupled to a plurality of subscribers, a central control station for performing overall system control, and a satellite for connecting the central control station and a plurality of base stations to each other In the satellite communication system to provide a communication function between subscribers; The public network matching device outputs a predetermined inoperable control signal to the processor when it falls into an inoperable state, and the processor outputs a predetermined error message according to the reception of the inoperable control signal from the public network matching device. Step, the public network matching device outputs a predetermined normal operation control signal to the processor when it is switched to the normal operation state, the processor contracts to the switch side to the public network matching device when receiving the normal operation control signal from the public network matching device And forwarding the trunk line initialization signal output request command, and the public network matching device outputs a predetermined trunk line initialization signal to the exchange side when the trunk line initialization signal output request command is received from a processor. It is done.

Description

Relay line initialization method in satellite communication system

The present invention relates to a satellite communication system, and in particular, when a public network matching device is in an inoperative (Fail) state and terminates abnormally with the public switched network, and the public network matching device is restored to normal, a predetermined initialization signal is transmitted to the public switched network. The present invention relates to a relay line initialization method in a satellite communication system that provides a stable service to subscribers by initializing a trunk line.

1 is a system configuration diagram for explaining the overall overview of the currently available satellite communication system.

In the drawings, reference numeral 1 is an artificial 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 a data terminal such as an exchange, a telephone, a computer, and a facsimile. A base station having an interface function for a terminal and providing a call function between the various terminals through transmission and reception of control data with the central control station 2.

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 actual subscriber information such as data and voice.

In the above configuration, the central control station (2) transmits a control message to each base station (3) through the service channel (S) in a normal state, and then based on a response message transmitted from the base station (3). The polling function of checking the state of (3), that is, the available capacity of the communication capacity or the communication channel is performed.

When there is a call request from a specific base station to a terminal of another base station jurisdiction, the available traffic channel T of the satellite is transmitted to both base stations if the base station can communicate with each other based on the information obtained in the polling process. By allocating, the two base stations can directly control each other.

Subsequently, when the communication between the base stations is terminated and the communication termination signal is applied through the service channel S from the base station to which the communication request has been made, the central control station 2 executes communication termination processing for both base stations. It releases the traffic channel T that was provided for.

2 is a block diagram showing the configuration of the base station 3 described above.

In the drawing, reference numeral 31 denotes an antenna for transmitting and receiving signals to and from the satellite 1, and 32 denotes an orthogonal mode transducer for separating and inputting and receiving signals transmitted and received through the antenna 31 using polarization quality of frequency. And a low noise amplifier for low noise amplifying a downlink frequency signal of 12.25 to 12.75G Hz input through the quadrature mode converter, and a frequency signal applied through the low noise amplifier, for example, Down converter for converting into frequency signal IF, 70MHz intermediate frequency signal applied from IF combination / distributor 33 to be described later is converted into microwaves of 14.0 to 14.5GHz, for example. A frequency up converter for generating a link frequency signal, and a high power amplifier for amplifying an uplink frequency signal output from the frequency up converter. r Amplifier).

In addition, reference numeral 33 separates and outputs the intermediate frequency signal applied from the RF processor 32 into a plurality of intermediate frequency signals, and combines the intermediate frequency signals applied from the SCPC channel unit 34 to be described later. Is an IF combiner / distributer, and 34 outputs to the processor 35 which will be described later by demodulating and decoding an intermediate frequency signal applied from the IF combiner / distributor 33. An SCPC channel unit that encodes and modulates a signal output from 35) and outputs the result to the IF combination distribution unit 33.

Here, the IF combination distribution unit 33 is employed for system scalability in the case of using a plurality of SCPC channel units 34.

Reference numeral 35 denotes a processor that performs overall control of the base station 3, and the processor 35 provides a direct communication function between subscribers based on a communication channel and a communication modem allocated from the central control station 2. 36 is a public interface port (Trunk Interface Port) for the interface between the present system and the exchange 40 will be described later, 40 is a public exchange network switch.

That is, in the base station having the above-described configuration, the processor 35 controls a series of operations to provide a direct communication function between subscribers based on the communication channel and communication modem allocated from the central control station 2.

Meanwhile, in the steady state, the public network matching device 36 transmits and receives a signal contracted by the switch 40, for example, by a line signaling method as shown in [Table 1]. In Table 1, symbols a and b mean the first two bits in the control channel of the trunk line (eg, the 16th frame among 32 frames).

Line Signaling Signaling Circuit status Signal sign Omnidirectional a b Backward direction a b Normal status 1 0 1 0 Occupancy 0 0 1 0 Confirmation of occupancy 0 0 1 1 answer 0 0 0 1 Recipient's recovery 0 0 1 1 Outbound recovery 1 0 0 1 or 1 1 Closure 1 0 1 1

However, if a public network matching device fails in a state in which a plurality of subscribers are communicating through a switch, services for all subscribers are interrupted. After that, the trunk line is restored after the public network matching device is restored. If it is not initialized, the other exchange side will continue to maintain the line state before the public network matching device fails, which causes a problem that the normal telephone service cannot be provided to the subscriber.

Accordingly, the present invention has been made in view of the above circumstances, and when the public network matching device becomes inoperable and terminates abnormally with the public switching network, when the public network matching device is restored to normal, a predetermined initialization signal is transmitted to the public switching network. It is an object of the present invention to provide a relay line initialization method in a satellite communication system that provides a stable service to subscribers by transmitting trunk initialization.

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 flowchart illustrating a relay line initialization method 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 31: antenna

32: RF processing unit 33: IF combination distribution unit

34: SCPC (Single Channel Per Carrier) Channel Unit (SCU)

35: processor

36: Public interface port (Trunk Interface Port)

40: exchanger

In the satellite communication system according to the present invention for realizing the above object, a relay line initialization method includes a plurality of base stations directly coupled with a plurality of satellite subscribers or public network subscribers, a central control station for performing overall system control, and a central station. A satellite communication system comprising a satellite for connecting a control station and a plurality of base stations to each other to provide a communication function between subscribers; The public network matching device outputs a predetermined inoperable control signal to the processor when it falls into an inoperable state, and the processor outputs a predetermined error message according to the reception of the inoperable control signal from the public network matching device. Step, the public network matching device outputs a predetermined normal operation control signal to the processor when it is switched to the normal operation state, the processor contracts to the switch side to the public network matching device when receiving the normal operation control signal from the public network matching device And forwarding the trunk line initialization signal output request command, and the public network matching device outputs a predetermined trunk line initialization signal to the exchange side when the trunk line initialization signal output request command is received from a processor. It is done.

That is, according to the above, when the public network matching device recovers after falling out of an inoperable state, it is possible to provide a stable service to a subscriber by initializing a corresponding trunk line connecting the switch.

Hereinafter, embodiments according to the present invention will be described.

3 is a flowchart illustrating a relay line initialization method in a satellite communication system according to an embodiment of the present invention.

First, when a failure occurs in the public network matching device 36 in a normal state in which normal communication function is performed between the subscribers of the public switched network and the satellite subscribers (step ST1), the public network matching device 36 is executed by the processor 35. ) Will transmit the agreed signal according to the board fail (step ST2). Then, the processor 35 transmits a predetermined release signal to the subscriber who is currently communicating (ST3 step).

Here, the communication line between the public network matching device 36 and the switch 40 is to use the E1 trunk line, the E1 trunk line can provide a call function to 30 subscribers at the same time.

In this case, when the public network matching device 35 fails, the control signal and the predetermined subscriber signal can no longer be transmitted to the switch 40, but the switch 40 is irrelevant to the failure of the public network matching device 36. It maintains a consistent operating state. That is, it continues to maintain the communication path provided to the public subscribers.

Thereafter, when the public network matching device 36 is restored and restarted (step ST4), the public network matching device 36 transmits the initialization signal contracted to the switch 40 for each communication channel (step ST5). Then, the switch 40 sets the operation state of the trunk line connected to the public network matching device 36 to the initial operation state. After that, the normal communication function of the public network matching device 36 and the switch 40 is achieved.

That is, according to the above, when the public network matching device recovers after falling out of an inoperable state, it is possible to provide a stable service to a subscriber by initializing a corresponding trunk line connecting the switch.

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.

As described above, according to the present invention, when the public network matching device becomes inoperable and terminates abnormally with the public switching network, and the public network matching device is restored to normal, the trunk line is initialized by transmitting a predetermined initialization signal to the public switching network. By doing so, it is possible to realize a relay line initialization method in a satellite communication system that provides a stable service to subscribers.

Claims (1)

A communication function between subscribers, each having a plurality of base stations directly coupled with a plurality of satellite subscribers or public subscribers, a central control station for performing overall system control, and a satellite for connecting the central control station and a plurality of base stations to each other. A satellite communication system for providing; The public network matching device outputs a predetermined inoperable control signal to the processor when it falls into an inoperable state; When the processor receives the inoperable control signal from the public network matching device, and outputs a predetermined error message accordingly, The public network matching device outputs a predetermined normal operation control signal to the processor when it is switched to the normal operation state, When the processor receives the normal operation control signal from the public network matching device, and forwards the trunk line initialization signal output request command promised to the switch to the public network matching device; And a public network matching device, outputting a predetermined trunk line initialization signal to an exchange side when the trunk line initialization signal output request command is received from a processor.