KR19990043024A - Central control station redundancy system in satellite communication system - Google Patents

Abstract

The present invention duplicates the central control station, assigns a TDM channel to each central station in a fixed manner, and when the active central station becomes inoperable and automatically switches to a standby central station. The present invention relates to a central control station duplication system in a satellite communication system that enables continuous service by controlling a system by using an allocated TDM channel. A base station and a first and a second central control station for combining the base station through the satellite to control a communication function between subscribers, wherein the first and second central control stations have independent control channels. And based on a control signal from the counterpart central control station.

Description

Central control station redundancy system in satellite communication system

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system using satellites. In particular, the central control station is duplexed, the TDM channel is fixedly assigned to each central control station, and the active central control station is inoperable, and thus standby. The present invention relates to a central control station duplication system in a satellite communication system that enables continuous service by controlling the system by using the allocated TDM channel when automatically switched to the central control 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 system configuration diagram showing an overall 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 provided to both the base stations 3A and 3B is released.

Meanwhile, the service channel S refers to a TDM channel of a time division multiple (TDM) method and an S-ALOHA channel of a slotted ALOHA (S-ALOHA) method, and FIG. 2 shows a satellite repeater mounted on the satellite 1. A diagram showing a channel division form of the service channel (S).

As shown in the figure, the frequency band available in one satellite repeater is 36Mhz, and there are 1200 channels divided by 30KHz in this frequency band. Three of these channels are allocated as TDM channels, and at least two to eight channels are allocated as S-ALOHA channels.

However, when the central control station 2 falls into an inoperable state or the TDM channel becomes in an unusable state, the entire network service cannot be performed, thereby preventing a normal service from being provided to a subscriber.

Accordingly, the present invention has been made in view of the above-described circumstances, and the central control station is duplexed, the TDM channel is fixedly assigned to each central control station, and the active central control station becomes inoperable and standby. (Standby) The purpose of the present invention is to provide a central control station duplication system in a satellite communication system that enables continuous service by controlling the system using the allocated TDM channel when automatically switched to a central control station.

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

FIG. 2 is a diagram illustrating a channel division form of a satellite transponder mounted on the satellite 1 of FIG. 1.

Figure 3 is a block diagram showing the configuration of a central control station redundancy system in a satellite communication system according to an embodiment of the present invention.

4 is a diagram illustrating a channel division form of a satellite transponder mounted on a satellite 10 when a central control station duplication system is applied 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

10: satellite 20A, 20B: central control station

30A, 30B: base station

In the satellite communication system according to the present invention for achieving the above object, the central control station duplication system includes a satellite equipped with a satellite repeater, a plurality of base stations each coupled with a plurality of subscribers, and the base station by combining the base stations through the satellites. And a first and a second central control station for controlling a communication function, wherein the first and second central control stations have independent control channels and are activated based on control signals by the counterpart central control station. It is characterized by.

That is, according to the above, if the active central control station becomes inoperable, the automatic switching to the standby central control station as well as the standby standby control station to control the system by using a fixed TDM channel for continuous service Becomes possible.

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

3 is a block diagram showing the configuration of a central control station duplication system in a satellite communication system according to an embodiment of the present invention.

In FIG. 1, reference numeral 10 is a satellite, 20 (20A, 20B) is a central control station that performs overall system control, and 30 (30A, 30B) is a base station providing communication functions between subscribers with various subscriber terminals and interface functions. to be.

Here, the channel division form of the satellite repeater mounted on the satellite 10 is shown in FIG. As shown in the figure, two TDM channels are allocated (TDM1 and TDM2), and each TDM channel is individually and fixedly allocated to the redundant central control station 20. In addition, each central control station 20 has channel information about the TDM channel of the other central control station 20 as well as its own TDM channel, and continuously refers to this when allocating a communication channel according to a subscriber's request. Done.

Next, the operation of the system having the above configuration will be described.

In the above configuration, when any central control station 20A is in an active state, the active central control station 20A performs overall system control as described in FIG.

That is, the active central control station 20A transmits a control message through the service channel S, and then checks the state of each of the base stations 30A and 30B based on the response message transmitted from the corresponding base station 30. Polling function will be performed. Then, based on the state information obtained in the polling process when a call is requested from a specific base station 30A to a terminal in the jurisdiction of another base station 30B, the available traffic channels T of the satellites 10 are selected from both base stations 30A and 30B. ), Both base stations 30A, 30B are controlled so that mutual communication can be performed directly. Subsequently, when the communication between the base stations 30A and 30B is terminated, the active central control station 20A executes the communication termination process for both base stations 30A and 30B to release the assigned traffic channel T.

On the other hand, as described above, while the central control station 20A is operating in the active state, the other central control station 20B is in the standby state.

At this time, the standby central control station 20B receives the response message transmitted from each base station 30 in the same manner as the active central control station 20A for the control message sent from the active central control station 20A. That is, the standby central control station 20B continuously receives the same information as the base station information of the active central control station 20A and maintains the base station information matched with each other.

Thereafter, when the active central control station 20A becomes inoperable or a communication incapable state of a fixedly allocated TDM channel occurs, the active central control station 20A sends a predetermined interrupt signal to the standby central control station 20B. Will output

Then, the standby central control station 20B performs overall system control through a fixedly allocated TDM channel (eg, TDM2) based on the information of each base station 30 held in the same manner as the active central control station 20A. Will be performed.

Therefore, according to the above embodiment, if the active central control station becomes inoperable, the automatic switching to the standby central control station as well as the standby standby control station to control the system by using a fixedly allocated TDM channel are continued. Service becomes possible.

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, the central control station is duplicated, the TDM channel is fixedly assigned to each central control station, and the active central control station becomes inoperable, and the standby central control station When the system is automatically switched, the central control station duplication system can be realized in the satellite communication system that enables continuous service by controlling the system using the allocated TDM channel.

Claims (1)

Satellites with satellite repeaters, Multiple base stations, each associated with multiple subscribers, And a first and a second central control station for coupling the base station via the satellite to control a communication function between subscribers. And said first and second central control stations have independent control channels and are activated based on control signals from the counterpart central control station.