KR100231510B1 - Transponder channel reserve device in satellite communication system and method thereof - Google Patents

Abstract

The present invention provides a transponder channel reserve of a satellite communication system that prevents an operator from using a channel of a specific frequency band by specifying and reserving the number of reserve channels among frequency channels used in a network, The present invention relates to an apparatus and a method thereof, and more particularly, to a system and method for controlling a transponder channel reserve command, A program storage unit in which an operation program for the control unit is stored, in particular, an operation program for processing a transponder channel reserve command is stored; A reserve information storage unit connected to the control unit and storing contents of the transponder channel reserve command; And a counter for counting the number of transponder channels to be reserved under the control of the control unit.

Description

Transponder channel reserve apparatus and method thereof in a satellite communication system

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

FIG. 2 is a block diagram showing the configuration of the central control station 2 in FIG.

3 is a block diagram showing the configuration of the network control unit 40 in FIG.

FIG. 4 is a memory map of the channel information storage unit 46 in FIG.

FIG. 5 is a block diagram showing a configuration of a transponder channel reserve device of a satellite communication system according to an embodiment of the present invention; FIG.

6 is a flowchart of a transponder channel reserve processing of a satellite communication system according to an embodiment of the present invention;

DESCRIPTION OF THE REFERENCE NUMERALS

1: satellite 2: central control station

3A and 3B: base stations 11A and 11B:

12A and 12B: telephones 13A and 13B: data terminals

14A, 14B: facsimile 21: antenna

22: orthogonal mode converter 23: low noise amplifier

24: frequency down converter 25: intermediate frequency combination /

26, 31: SCPC channel unit 32: frequency up converter

33: high-power amplifier 40: network controller

41: processor 42: service channel controller

43: dual port RAM 44: program storage unit

45: base station information storage unit 46: channel information storage unit

50: network management system 51: processor

52: program storage unit 53: reserve information storage unit

54: Counter

The present invention relates to a communication system using a satellite, and more particularly, to a satellite communication system in which an operator specifies and reserves the number of reserve channels among frequency channels used in a network, thereby preventing another service from using a channel of the specific frequency band. To a transponder channel reserve apparatus and method thereof in a communication system.

In recent years, with the rapid development of communication technology, satellite communication that enables subscribers located at a remote place to make calls through a satellite is gradually becoming common. Such satellite communication is useful for long distance communication between countries, or communication method of a mountainous country like Korea because a separate signal line is not required for communication.

In the above-mentioned satellite communication, there are two methods of PAMA (Pre Assignment Multiple Access) method for allocating each communication channel for each subscriber according to the channel allocation method and DAMA (Demand Assignment Multiful Access) method for allocating a communication channel according to a subscriber's request In general, in the satellite communication system for communication between subscribers, the DAMA system is adopted in consideration of the price and effectiveness of the communication channel.

FIG. 1 is a block diagram showing an overall system configuration of a general satellite communication system according to a DAMA system.

In FIG. 1, reference numeral 1 denotes a satellite having a plurality of communication channels, reference numeral 2 denotes a central control station for controlling the entire satellite communication system, reference numeral 3A and 3B denote exchangers 11A and 11B and telephones 12A and 12B ), A data terminal 13A, 13B such as a computer, and facsimile machines 14A, 14B, as well as a communication function between the various terminals through data transmission / reception with the central control station 2 .

In FIG. 1, reference symbol S denotes a service channel for transmitting and receiving control data, and T denotes a traffic channel for transmitting and receiving data and omnipresence.

In the above configuration, the central control station 2 transmits a control message through the service channel in a normal state, and then, based on the response message transmitted from the corresponding base station 3, And performs a polling function for checking the available capacity or the use state 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 judged whether or not the corresponding base station 3B can communicate with the base station 3B based on the information obtained in the polling process And if the communication is enabled, the available traffic channels T of the satellites are allocated to the base stations 3A and 3B so that the base stations 3A and 3B can directly communicate with each other.

Then, when the communication end signal is applied via the service channel S from the base station 3A in which communication has been completed between the base stations 3A and 3B and the communication request has been made, the central control station 2 transmits The communication end process is executed to release the traffic channel T that was provided to both the base stations 3A and 3B.

2 is a configuration diagram showing the configuration of the central control station 2 described above.

2, reference numeral 21 denotes an antenna for transmitting / receiving an uplink signal and a downlink signal to / from the satellite 1. Reference numeral 22 denotes an antenna for transmitting and receiving an uplink signal and a downlink signal, An orthogonal mode transducer (OMT) 23 for separating and inputting signals transmitted and received through the orthogonal mode converter 22, a low noise amplifier 23 for low-noise amplifying a downlink frequency signal of 12.25 _to 12.75 GHz inputted through the orthogonal mode converter 22 LNA (Low Noise Amplifier), and 24 is a frequency down converter (DC) for converting a frequency signal applied through the low noise amplifier 23 to an intermediate frequency signal IF of, for example, 70 MHz.

Reference numeral 25 denotes a frequency division multiplexer for separating and outputting an intermediate frequency signal IF applied from the frequency down converter 24 to a plurality of intermediate frequency signals and outputting a single channel per channel (SCPC) channel unit (IF C / D: Combiner / Distributor) 26 for outputting an intermediate frequency signal applied from the intermediate frequency combining / distributing unit 25, The intermediate frequency combining / distributing unit 25 is employed for system scalability when a plurality of SCPC channel units are used.

Reference numeral 31 denotes an SCPC channel unit (SCU) that encodes and modulates a message output from the network control unit 40 to be described later, and 32 denotes a 70 MHz A frequency up converter (UC: Up Converter) 33 for converting the IF signal of the frequency up converter 32 into an ultrahigh frequency of 14.0 to 14.5 GHz to generate an uplink frequency signal; It is a high power amplifier (HPA: High Power Amplifier).

Reference numeral 40 denotes a polling function for sending a control message to each base station 3 through the SCPC channel unit 26 and then checking the status of each base station 3 based on a response message transmitted from the corresponding base station If there is a call request from a particular base station, it is determined whether the other base station is capable of communicating based on the information obtained in the polling process. If the base station is in a communication enabled state, the available traffic channel T ) And a modem (SCU) to both base stations so that both base stations can directly perform mutual communication.

Reference numeral 50 denotes a network management system for a system administrator to manage the overall network of the satellite communication system by managing the network control unit 40.

3 is a block diagram schematically showing the configuration of the network control unit 40. Reference numeral 41 in the figure denotes a processor for controlling call processing between the base stations in addition to controlling the entire system, ALOHA (Slot ALOHA) packet to the SCPC channel unit 31 and extracts a TDM (Time Division Multiplex) stream (SCC: Service Channel Controller) for generating and outputting a message of the service channel controller (SCC).

Also, reference numeral 43 is a dual port RAM, which is provided for data transmission / reception between the processor 41 and the service channel controller 42.

Reference numeral 44 denotes a program storage unit in which an operation program of the processor 44 is stored. Reference numeral 45 denotes a base station information storage unit in which state information of each base station obtained by the polling operation of the network processor 40 is stored. Is a channel information storage unit for storing a usage state of a communication channel allowed by the satellite.

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

In the normal state, the network control unit 40 of the second degree performs the polling operation to check the state of each base station.

That is, the processor 41 of the network control unit 40 writes the packet data for checking the status of each base station into the dual port RAM 43, and the service channel controller 42 controls the dual port RAM 43 Reads the written packet data, generates a message of the TDM stream, and outputs the message to the SCPC channel unit 31.

Then, the SCPC channel unit 31 converts the intermediate frequency signal of 70 MHz, for example, by encoding and modulating the message, and the intermediate frequency signal is combined by frequency in the IF combining / distributing unit 25, For example, 14.5 GHz in the up conversion unit 32. [ The uplink frequency signal is output through the high-power amplifier 33, the orthogonal mode converter 22 and the antenna 21, and then transmitted to each base station 3 via the satellite 1 in FIG. 1 .

The response message received from each base station 3 via the antenna 1 to the antenna 21, that is, the downlink frequency signal of 12.25 GHz, is transmitted through the orthogonal mode converter 22 and the low noise amplifier 23 to the frequency down- And converted into an intermediate frequency signal of 70 MHz and applied to the SCPC channel unit 26 via the IF combining / distributing unit 25 to be demodulated and decoded and then applied to the network controller 40.

The network controller 40 extracts the packet information from the message to which the service channel controller 42 is applied to generate the S-ALOHA packet and write it into the dual port RAM 43, The packet data is read out from the port RAM 43 and the status information for each base station is retained by updating and registering the base station information storage unit 45 based on the packet data.

In addition, the above-described polling operation is continuously executed for each base station.

On the other hand, if there is a call request from any base station to any other base station during the above-described polling operation, that is, a message indicating a call request is received from the satellite 1 via the second antenna 21 When the corresponding packet data is input from the service channel controller 42 of the network control unit 40, the processor 41 first reads out the status information of the called base station from the base station information storage unit 45, If it is determined that communication is possible, the channel information storage unit 46 checks the currently available communication channel.

4 shows a memory mapping of the channel information storage unit 46. The channel information storage unit 46 has a storage area corresponding to the number of communication channels that the satellites can accept, The binary data of "0" or "1" is stored in the area according to whether or not the corresponding communication channel is used. The binary data is changed and set by the processor 41 according to the use state of the communication channel.

That is, when there is a call request from an arbitrary base station, the processor 41 examines a communication channel written as "0" in the channel information storage unit 46 when the busy state of the communication channel is & By assigning to the calling base station and the called base station, both base stations are enabled to communicate directly via this assigned communication channel. This allocation of the communication channel is performed by sending a message to both base stations, and by setting the corresponding area of the channel information storage unit 46 corresponding to the allocated communication channel to "1" This is referred to in the assignment.

When a communication termination message is transmitted from the calling base station after the communication channel is allocated, the processor 41 transmits a message indicating that the communication has been terminated to the base stations in which the communication has proceeded, The communication end processing is executed by setting the area again to "0 ".

However, when the characteristic of a specific frequency band is poor, the quality of service provided through the channel is degraded. Therefore, it is necessary to restrict the use of the channel while improving the characteristic of the frequency band , And it is also necessary to limit the use of a predetermined portion of the band in order to secure a channel for use in a specific use.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a transponder channel of a satellite communication system, The present invention is directed to a reserve apparatus and a method thereof.

In order to achieve the above object, a transponder channel reserve device of a satellite communication system according to the present invention specifies a number of transponders to be reserved by an operator from an external network management system, and manages a corresponding process on a received transponder channel reserve command A control unit; A program storage unit in which an operation program for the control unit is stored, in particular, an operation program for processing a transponder channel reserve command is stored; A reserve information storage unit connected to the control unit and storing contents of the transponder channel reserve command; And a counter for counting the number of transponder channels to be reserved under the control of the control unit.

According to another aspect of the present invention, there is provided a transponder channel reserve method of a satellite communication system, the method comprising: a controller for managing a process of a transponder channel reserve command; And a counter for counting the number of transponder channels to be reserved under the control of the control unit. The transponder channel reservation method is applied to a satellite communication system, Storing the operator designation count in the reserve information storage unit and initializing the idle temporary count and the index when the transponder channel reserve (RSV) command is issued; An idle temporary count confirming step of confirming whether the idle provisional count is equal to or greater than the operator designation count; An idle channel searching step of, when the idle temporary count checking step is performed, decreasing the index number and reserving an idle channel searched for and returning to the idle temporary count checking step; And reporting the reserved transponder channel number to an external network management system if the idle temporary count is greater than or equal to the operator specified count after the step of confirming the idle temporary count.

In other words, according to the above description, the present invention allows the operator to restrict the use of a specific channel by inputting a transponder channel reserve (RSV) command by specifying a range of a transponder channel to be reserved.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 5 is a block diagram of a transponder channel reserve device of a satellite communication system according to the present invention. In FIG. 5, the same reference numerals are assigned to the same parts as those in FIG. 3, and a detailed description thereof will be omitted.

As shown in the figure, reference numeral 51 denotes a processor for managing a process corresponding to a transponder channel reserve command inputted by designating the number of transponders to be reserved by the operator to the network management system 50, 53 denotes a transceiver that is connected to the processor 51 so as to transmit the transceiver channel reserve command to the transceiver 51 which is input from the network management system 50, A reserve information storage unit for storing the content of the ponder channel reserve command, and a counter 54 for counting the number of transponder channels to be reserved.

Next, the operation of the apparatus constructed as described above is described with reference to FIG.

FIG. 6 is a flowchart of transponder channel reserve processing in the satellite communication system according to the present invention.

When the operator instructs the network management system 50 to specify the number of transponder channels and issue a transponder channel reserve (RSV) command (ST 601), the processor 51 of the network control unit 40 The idle temporary count for counting the idle transponder channel and the idle temporary count for counting the idle transponder channel are stored in the memory of the channel information storage unit 46, The index to be used in the map is initialized to zero (ST 603).

If it is determined that the idle temporary count is equal to or greater than the operator designation count (ST 604), the index number is increased by 1 (ST 605), and if the channel corresponding to the new index is idle (ST 606). If the channel is not idle, the index number is incremented by one (ST 605). If the channel is idle, the idle temporary count is incremented by one (ST 607).

In step 608, the idle channel corresponding to the index is changed to a busy state in the memory map of the channel information storage unit 46, and the reserved transponder channel number is stored during the use (ST 609 If the idle temporary count is greater than or equal to the operator specified count, the method returns to step 604 to check whether the idle temporary count is equal to or greater than the operator specified count (ST 604). If the idle temporary count is greater than or equal to the operator specified count, System 50 (ST 610).

That is, according to the embodiment, the number of frequency channels used in the network is not used by another service as many as the number of transponder channels desired by the operator.

The present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the technical scope of the present invention.

Claims (2)

A satellite communication system having a central station for providing a communication link between subscribers by assigning a frequency channel of a transponder composed of a predetermined frequency channel to a subscriber, the satellite communication system comprising: means for storing information on the frequency channel allocation status of the transponder A channel information storage means for storing frequency channel information set for reservation in the transponder, a reservation information storing means for storing frequency channel information set for reservation in the transponder, a channel information storing means for storing, And a controller for reading information corresponding to the number of reserved channels in a reserve command applied by the system operator and searching for the channel information storage means to change an unused channel to in use, And the number of channels changed and set in use by the channel information storage means And control means for controlling the channel information storage means to store the channel information changed and set in the reserve information storage means so as to be equal to the number of channels read out in the Zorb command. The system's transponder channel reserve device. A satellite communication system having a central station for storing information on the presence or absence of frequency channel allocation of the transponder in a first memory, by providing a communication link between subscribers by allocating a frequency channel of a transponder composed of a predetermined frequency channel to subscribers, , The method comprising the steps of: when receiving a channel allocation request command for reserve by a system operator, reading information corresponding to the number of channels to be allocated for reservation in the received reserve channel allocation request command A reserve initialization step of initializing an idle temporary count and a channel index, a step of initializing the idle temporary count and the channel index, a step of storing the idle temporary count and the reserved channel number information in the second memory, A number of reserved channels for confirming the number of reserved channels, If the idle temporary count is smaller than the number of reserved channels in the checking step, a channel searching step of searching the use of the transponder channel stored in the first memory by increasing the channel index by "1 " If the channel being used is found, the idle temporary count is incremented by "1", the transponder channel retrieved from the first memory is changed to being used, and the channel information changed in the first memory is stored in the second memory Wherein the step of checking the number of reserved channels includes the step of checking the number of reserved channels and the step of checking the number of reserved channels if the number of reserved channels is equal to or greater than the number of reserved channels, And a reserved channel setting step of setting the corresponding channel as a reserved channel How transponder channels Reserve of St. communication system.