KR100198749B1 - Transponder channel reservation device and method in satellite communication system - Google Patents

Abstract

The present invention relates to a transponder channel reserve apparatus and method of a satellite communication system for restricting use of a channel of a specific frequency band among frequency channels used in a network, A network manager for managing the overall network of the satellite communication system by managing the network controller, a message processor for processing a message communicated between the network controller and the network management system, When the transponder channel reserve command is received from the message processor, the corresponding parameter is reformatted and the transponder channel reserve command is transmitted to the network controller, And a timer for setting a waiting time for the transponder channel reserve processor to wait for a result after the transponder channel reserve request is made to the network controller by the transponder channel reserve (RSV) .

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 central control station 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, 12B: telephones 13A, 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: message handler

52: RSV processor 53: timer

In particular, the present invention relates to a communication system using a satellite, in which an operator specifies and reserves a number of a transponder channel and a reserve channel in which a reserve is started, And more particularly, to a transponder channel reserve apparatus and method thereof in a satellite communication system.

In recent years, with the rapid development of communication technology, satellite communication that enables a subscriber located at a remote place to make a call through a satellite is becoming common, and since such a satellite communication does not require a separate signal line for communication It is mainly used as a long distance communication between countries or as a communication method of a mountainous country like Korea.

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 facsimiles 14A, 14B, and also has a function of communicating with the central office 2 through data transmission / .

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 voice.

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 determined whether or not the 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 the communication between the base stations 3A and 3B has been completed 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 to be 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 input 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: IF Combiner / Distributor) that combines and outputs intermediate frequency signals applied from the intermediate frequency combining / distributing unit 25, The SCPC channel unit demodulates, decodes, and outputs a frequency signal, wherein the intermediate frequency combination / distribution 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) 33 for converting an IF signal into a microwave having a frequency of 14.0 to 14.5 GHz to generate an uplink frequency signal, a high power amplifier 33 for amplifying an uplink frequency signal output from the frequency up converter 32, 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 for 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 specific base station, it is determined whether the other base station is capable of communicating based on the information obtained in the polling process. If it is in the 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 the system manager 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 encodes and modulates the message to convert it into an intermediate frequency signal of, for example, 70 MHz, and outputs the intermediate frequency signal. The intermediate frequency signal is combined by frequency in the IF combining / distributing unit 25, The frequency up conversion unit 32 converts the uplink frequency signal of 14.5 GHz, for example. The uplink frequency signal is outputted through the high-power amplifier 33, the orthogonal mode converter 22 and the antenna 21, and then transmitted to each base station 3 through the satellite 1 in FIG. 1 .

A response message received from each base station 3 via the antenna 1 to the antenna 21, that is, a downlink frequency signal of 12.25 GHz, is supplied to the frequency down converter 23 through the orthogonal mode converter 22 and the low noise amplifier 23, 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, when there is a call request from any base station in the above-described polling operation to any other base station, 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, 0 " or " 1 " binary data is stored in the area according to whether the corresponding communication channel is used or not. 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 checks the communication channel written in the channel information storage unit 46 to 0 when the in-use state of the communication channel is 1, Quot; base station " so that both base stations can communicate directly via this assigned communication channel. The allocation of such a communication channel is performed by sending a message to both base stations. In addition, the corresponding area of the channel information storage unit 46 corresponding to the allocated communication channel is set to " 1 " .

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 characteristics of a specific frequency band are poor in the frequency channel used, the quality of the service provided through the channel is degraded. Therefore, it is necessary to limit the use of the channel while improving the characteristics of the frequency band And it is also necessary to restrict 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, the present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an apparatus and method for enabling a user to reserve a channel by another service by reserving a first number of a transponder channel and a reserve- And a transponder channel reserve apparatus and method thereof in a satellite communication system.

According to an aspect of the present invention, there is provided a transponder channel reservation apparatus in a satellite communication system, which performs a polling process for checking the status of each base station and, when there is a call request from a specific base station, A network management unit for managing the entire network of the satellite communication system by managing the network control unit by a system manager, a network management unit for managing the overall network of the satellite communication system, A message processor for processing a message communicated between the network management system and the network management system, and managing the transponder channel reserve command inputted by designating the reserve-initiated transponder channel number and the number by the operator in the network management system A transponder channel reserve (RSV) processor for receiving a transponder channel reserve command from the message processor and formatting the corresponding parameter to request the network controller to request a transponder channel reserve; and a transponder channel reserve And a timer for setting a waiting time for requesting a channel reservation to the network control unit and waiting for a result of the request.

According to another aspect of the present invention, there is provided a method for reserving a transponder channel in a satellite communication system, the method comprising the steps of: When the management system transmits a transponder channel reserve (RSV) command to the transponder channel reserve (RSV) processor in which the location and range of the transponder channel reserved by the operator is input, the channel reserve processor registers the timer, A channel reservation request step of requesting a control unit to perform a transponder channel reservation; Wherein the network controller which receives the transponder channel reserve (RSV) command turns on / off a reservation of a transponder channel designated by the operator and transmits a transponder channel reserve response to the transponder channel reserve signal to a transponder channel reserve (RSV) Performing step; And a channel reserve response step of, after the transponder channel reserve (RSV) processor having received the transponder channel reserve response releases the timer, transmitting the transponder channel reserve result to the network management system.

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 in a satellite communication system according to the present invention. In FIG. 2, the same reference numerals are assigned to the same parts as those in FIG. 1, and a detailed description thereof will be omitted.

As shown in the figure, reference numeral 51 denotes a message processor for processing a message communicated between the network control unit 40 and the network management system 50, 52 denotes a network management system 50, When the transponder channel reserve command is received from the message processor 51, the corresponding parameter is reformatted and transmitted to the network controller 40 A transponder channel reserve (RSV) processor 53 for requesting a transponder channel reservation with the transponder channel reservation, 53, a transponder channel reserve processor 52 for requesting the transponder channel reserve to the network controller 40, This is a timer for setting the wait time.

Next, the operation of the apparatus constructed as described above will be 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 network management system 50 transmits a transponder channel reserve (RSV) command input from an operator to a transponder channel reserve (RSV) processor 52 as shown in the drawing (ST601), the channel reserve processor 52 registers the timer 53 (ST602), and requests the network controller 40 to reserve a transponder channel (ST603).

At this time, the data format of the transponder channel reserve (RSV) command includes a reserve-off 0 for restoring a transponder-reserved channel to a normal state or a reserve-ID 0 for setting a reserve- A starting transponder channel ID field indicating a first channel value (e.g., 0-599) of a transponder to be reserved, and a starting transponder channel ID field indicating a channel number of a transponder to be continuously reserved from the value of the starting transponder channel ID field (E.g., 1 to 599).

Accordingly, the network controller 40, which has received the transponder channel reserve (RSV) command, turns on / off the reserve of the transponder channel for a specific band (ST604) and transmits a transponder channel reserve response to the transponder channel (ST605), the channel reserve processor 52 releases the timer 53 (ST606), and transmits the result of the transponder channel reservation to the network management system 50 (ST607).

That is, when the network control unit 40 receives a transponder channel reserve (RSV) command, it determines whether the designated channel is valid. If the channel is valid, the network control unit 40 determines whether the channel is Busy, And outputs a result message of "Already busy".

Accordingly, the transponder channel reserve processor 52 has a waiting time of 10 seconds by the timer 53 registered with the transponder channel reserve command. In this wait time, for example, success or failure is received from the network controller 40 When a response such as TP Channel in busy or Out of Bandwith is received, ie, the result of the reservation on / off success (OK), parameter range error, channel saturation, And transmits a response timeout message to the network management system 50 without performing retransmission if a response is not received within the waiting time.

That is, according to the embodiment, the present invention can prevent a specific part designated by an operator from being used in a frequency channel used in a network, or restore a reserved channel to its original state.

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 (5)

A transponder channel reserve processor for reformatting a transponder channel reserve message input from the network management system into corresponding parameters and transmitting the reformatted message to the network control means, A timer for setting a waiting time for the ponder channel reserve processor to send the transponder channel reserve to the network control means and wait for the result, and a timer for setting a reserve channel start address of the transponder channel reserve message received from the transponder channel reserve processor Searches the corresponding start channel in the transponder channel based on the received data, and controls the channel to be set to correspond to the number of reserved channels based on the found start channel, and transmits the resulting message to the network management system Shipment to transponder channel reserve unit of a satellite communication system, characterized in that configured including network control means. A satellite communication system capable of transmitting and receiving data between both base stations by allocating a transponder channel used as a communication link between the base stations to both base stations, the system comprising: means for determining a start position and a number of a transponder channel to be input by a system operator A reserved channel start position search step of searching for a reserve channel start position in a transponder channel by reading reserved channel start position information from the received reserve channel information, A channel reservation step of assigning a predetermined reserved channel range by counting the number of reserve channels received based on a start position searched in a position search step; If the message information received in step Set to a particular region or set Reserved transponder channel reserved way of a satellite communication system, characterized in that configured by a channel on / off so as to terminate further comprising: a specific area. The method according to claim 2, further comprising: a reserve ID (Identification) field indicating that the transponder channel of the data format of the reserve channel information is to be reserved or reserved, and to restore the transponder channel to a normal state; A start transponder channel ID field indicating a first channel value and a count field indicating a number of transponder channels to be continuously reserved from the value of the start transponder channel ID field. Way. 3. The method of claim 2, wherein the performing the channel reserve step comprises: a reserve ON / OFF confirmation step of confirming whether a reservation is ON / OFF based on reception of a reserve channel information message; A channel reservation on step of transmitting a reserve success or failure message according to whether the channel specified in the reserve channel information message is valid and whether to use the reservation channel; and, if it is determined that the reserved ON / Normal < / RTI > state of the satellite communication system. The method as claimed in claim 4, wherein the channel reserve ON step comprises: a channel validity determination step of determining whether a channel specified in the transponder reserve channel information message is valid; if the channel of the specified range is not valid, Determining whether the channel is Busy if the message is valid and if it is valid; checking whether there is a busy channel in the channel of the specified range and outputting a reserve failure message if there is no channel being used; And a channel reserve result transmission step.