KR19990061194A - Data processing load prevention method of central station in multi-satellite communication system - Google Patents

Abstract

The present invention relates to a multimedia satellite communication system for transmitting multimedia data, such as image data, to a satellite communication subscriber at high speed. A method for preventing data processing load of a central station in a multi-satellite communication system.

In the present invention, when the traffic data to be sent to the terminal station is received from the Internet through the IP processing unit 10 via the path processing control unit 18, the transmission processing path is automatically set according to the IP address of the received traffic data, and is transmitted. At this time, the amount of data to be transmitted is counted based on the IP address of the data to be transmitted and processed, and the counted information for each IP information is sent to the database 27 and stored, and the database 27 sets the processing path according to the counting result. After that, if there is an access request from the terminal station, the transmission data processing path corresponding to the IP is reset by allocating PID according to the processing path setting order.

Therefore, according to the present invention, the transmission data processing load can be prevented because the transmission data is not concentrated in any transmission processing path.

Description

Data processing load prevention method of central station in multi-satellite communication system

The present invention relates to a multimedia satellite communication system for transmitting multimedia data, such as image data, to a satellite communication subscriber at high speed. A method for preventing data processing load of a central station in a multi-satellite communication system.

1 is a block diagram showing an overall system configuration of a multimedia satellite communication system that enables a subscriber to receive multimedia data at high speed from the Internet or a multimedia service provider.

In FIG. 1, reference numeral 1 denotes a central station connected to the Internet, which provides various multimedia services to terminal stations, and performs overall network operation management and control functions. In addition, reference numeral 3 is a terminal station antenna, 4 is a set top box as a terminal station providing multimedia services to a general subscriber, 5 is a personal computer as a terminal for a user to perform multimedia communication, and 6 is a satellite. to be.

That is, in the multimedia satellite communication system having the above-described configuration, since the amount of data received from the Internet is much larger than the amount of data transmitted through the Internet, the set-top box (4) from the central station 1 is considered in consideration of this point. In the case of forward link transmitting through a TDM method, a large amount of messages can be transmitted, and in case of a return link transmitting from the set-top box 4 to the central station 1, a plurality of subscribers Code Division Multiple Access (CDMA) scheme is used to accommodate this.

In addition, the central station 1 is coupled to the Internet based on TCP / IP, and transmits and receives various data with the Internet through an IP packet (Internet Protocol Packet). Then, for example, an MPEG-2 TS (Transport Stream) packet for a multimedia service is generated based on an IP packet for a subscriber received from the Internet, and the generated packet data is transmitted to the set-top box 4 through a TDM scheme. do. Then, the CDMA modulated data received from the set-top box 4 is received, the IP packet is generated based on this, and the IP packet is transmitted to the Internet.

On the other hand, the multimedia satellite communication system having the above configuration has been filed by the present applicant, the detailed configuration and description thereof will be omitted.

That is, referring to the operation of the multimedia satellite communication system having the above-described configuration, first, the central station 1 includes various kinds of information required when the set-top box 4 requests access to the central station 1, for example, the central station 1. An information service is provided which provides a CDMA code and channel frequency data for transmitting a control message and a PID for information service for common reception in all set-top boxes 4.

In addition, the information service described above is repeatedly executed at regular intervals, for example, when the number of TS packets transmitted from the central station 1 to the set top box 4 reaches 100.

On the other hand, in the set-top box (4) stores the service information transmitted from the central station 1, that is, CDMA code data, channel frequency data, and information service PID used when requesting a call connection to the central station (1). do.

When the access request for the Internet, that is, the call connection request, is input from the personal computer 5 in the above-described state, the set-top box 4 receives the subscriber information input from the computer 5, namely, the subscriber ID, password, After generating a predetermined control message based on the subscriber address or the like, the access request is executed to the central station 1 by allocating CDMA code data and channel frequency data.

Subsequently, when the access request is input through the above-described process, the central station 2 first compares the subscriber's IP and password included in the control message with the subscriber's information to determine whether the current access request is a legitimate subscriber. do.

At this time, if it is determined that the user is a legitimate subscriber, the database is searched to determine whether there is a PID currently available, and the control top, traffic PID, channel frequency, and CDMA code are assigned to the set-top box 4. At this time, the information service PID is used as the PID of the TS packet transmitted to the set top box 4.

In the set top box 4, the control PID and the traffic PID assigned by the central station 1 are set, and the CDMA code and channel frequency data transmitted from the central station 1 are allocated. Then, the personal computer 5 is informed that the call connection is successful.

Subsequently, when the IP packet for transmitting to the Internet from the personal computer 5 is input, the corresponding traffic data is transmitted to the central station 1, and when the central station 1 receives the traffic data from the set-top box 4, It is converted into an IP packet and sent to the Internet.

On the other hand, when traffic data is received from the Internet, the central station 1 generates and transmits a predetermined data frame, that is, a TS packet, through a transmission data processing apparatus to transmit it to the set-top box 4. In the case where a large amount of data is received, the central station 1 has a load in transmitting the received data to the terminal station, so that there is a possibility that some disruption occurs in the generation of data packets to be sent to the set-top box 4. Will be.

Accordingly, the present invention has been made in view of the above-described circumstances, and by distributing and processing the transmission data in the transmission data processing of the central station to be transmitted to the terminal station, it is possible to prevent the data processing load generated due to the excessive transmission data. The purpose of the present invention is to provide a data processing load prevention method of a central station in a multi-satellite communication system.

1 is a block diagram showing the overall configuration of a multimedia satellite communication system.

2 is a block diagram showing the configuration of a central station 100 to which a data processing load prevention apparatus is applied in a multi-satellite communication system according to an embodiment of the present invention.

3 is a mapping diagram of data stored in the memory 17 and the database 27 of FIG.

Figure 4 is a block diagram showing the configuration of a set-top box (4) in a multimedia satellite communication system.

5 is a flowchart illustrating a data processing load prevention method in a multi-satellite communication system according to an embodiment of the present invention.

Explanation of symbols for main parts of the drawings

1: central station 2, 3: antenna

4: set top box 5: personal computer (PC)

6: satellite 10: IP switch

17: memory 18: path processing control unit

19: Transmission data processing device 20: Modulation device

21: intermediate frequency combination device 22: RF device

23: demodulation device 24: CDMA receiving device

25: reception data processing device 26: central international language processor

27: Database 28: Network Management System (NMS)

29: data transmission coefficient unit 31: RF device

32: tuner 33: demodulator

34: Demultiplexer (DMUX) 35: Network Interface Card (NIC)

36: transmission frame generator 37: CDMA channel transmitter

38: modulator 39: IF generator

40: Transmission timing generator 41: Data memory

42: processor

In the multi-satellite communication system according to the present invention for realizing the above object, the data processing load prevention method of the central station allocates service information required when the terminal station requests access, and is physically coupled with the Internet to input data from the Internet. In the multimedia satellite communication system for generating a predetermined packet data to transmit to the terminal station, Receiving traffic data from the Internet or receiving a control message generated by itself, the data receiving step, corresponding to the IP information of the received data A transmission path switching step of setting switching to the transmission data processing unit, a data transmission processing step of transmitting data through the set transmission processing path, a transmission throughput coefficient step of counting data amount based on IP information of the data to be transmitted, and counting Send throughput data to database And a transmission path storing step for storing the transmission throughput, a processing path setting priority step for determining the setting order of the transmission data processing unit corresponding to the IP information according to the transmission throughput result, and a terminal station PID according to the processing path setting order specified when the access is requested from the terminal station. Characterized in that it comprises a process path reset execution step of assigning.

That is, according to the present invention having the above-described configuration, when traffic data to be sent to the terminal station is received from the Internet through an IP switch, the transmission processing path is automatically set and transmitted according to the IP address of the received traffic data. Count the amount of data to be processed based on the IP address of the data to be transmitted and send the information counted for each IP information to the database and store it.The database sets the processing path setting order according to the counting result and accesses it from the terminal station. If there is a request, the transmission data processing path corresponding to the IP is reset by allocating the PID according to the processing path setting order.

Therefore, the data is not concentrated and processed along one path set in the transmission data processing of the central station, thereby preventing the load of the data processing.

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

2 shows a configuration of a central station to which a data processing load prevention apparatus is applied in a multi-satellite communication system according to an embodiment of the present invention.

In FIG. 2, reference numeral 100 denotes a central station to which a data processing load preventing apparatus according to the present invention is applied, 10 denotes an IP switch for switching an Internet Protocol packet, and the IP switch 10 includes a DNS (Domain Name). System (11) server, E-mail server (12), Web (WEB) server (13), Proxy (14), MSP (Multimedia Service Providder: 15), Router (Router: 16), etc. Will be combined. In this case, the MSP includes a home banking system, a home shopping system, a distance education system, a video conference system, and the like.

In particular, the router 16 executes connection processing between the central station 100 and the Internet, which converts an IP packet input from the Internet into the central station 100 into data of an Ethernet frame and converts the data from the central station 100 to the Internet. Ethernet frame sent to IP packet is converted into IP packet.

In the drawing, reference numeral 17 denotes a memory in which the transmission data processing unit corresponding to the terminal station IP address is stored, and the IP stored in this memory 17 and the transmission data processing unit corresponding thereto are shown in FIG. A mapping diagram is shown, and 18 is a path processing control section for switching and setting a path for transmission processing according to the IP address of data input from the IP switch 10 based on the stored information of the memory 17. The path processing control unit 18 is normally switched to the first transmission data processing unit 19 ₁ of the transmission processing apparatus 19 so that the access data required for initial connection of the set top box 4 is transmitted. Therefore, the switching setting is changed according to the IP address of the packet data input to the path processing control unit 18.

Further, reference numeral 29 denotes a data transfer amount counting unit for counting the amount of data transmitted through the path processing control unit 18, and counts the number of data packets based on the IP address of the transmitted data. The data is sent to the database 27 to be described later.

Reference numeral 19 denotes a transmission data processing apparatus comprising a plurality of transmission data processing units 19 _{1 to} 19n for processing transmission data output through the path processing control unit 18 to generate MPEG-2 TS packets, for example. Initially, the transmission data processing unit 19 ₁ is used to transmit and process access service information used during initial access of the terminal stations, and the remaining transmission data processing units 19 _{2 to} 19 n are used to transmit traffic data. The remaining transmission data processing units 19 ₂ to 19 n for traffic data transmission processing each store PID information corresponding to the IP address allocated to them.

Further, reference numeral 20 denotes a modulator 20 _{1 to} 20n for outputting, for example, a 70 MHz intermediate frequency signal by performing QPSK modulation (Quadrature Phase Shift Keying Modulation) on the TS packet data output from the transmission data processing apparatus 19. Is a modulation device consisting of a plurality. Also in this modulator 20, the first modulator 20 ₁ modulates and outputs the intermediate frequency outputted from the transmission data processor 19 ₁ for access data transfer processing, and the remaining modulators 20 _{2 to} 20 n It is coupled to the remaining transmission data processing units 19 ₂ to 19 n, respectively, and modulates and outputs intermediate frequencies output from them.

In addition, reference numeral 21 is an intermediate frequency combination unit for combining and outputting a plurality of intermediate frequency signals output from the modulator 20, and 22 is frequency up-converting the intermediate frequency output from the intermediate frequency combination unit 22. And an RF device for amplifying a high output to the antenna 2 and outputting a high frequency signal received through the antenna 2 by a frequency down-conversion and low noise amplification, and 23 denotes an intermediate frequency signal input from the RF device 22. It is a demodulator to demodulate

Further, reference numeral 24 denotes a CDMA receiving apparatus for CDMA demodulating the CDMA modulated data input by frequency demodulation in the demodulator 23 to output original packet data, and 25 denotes data input from the CDMA receiving apparatus 24. A reception data processing device for processing, wherein the reception data processing device 25 converts the IP packet data or the control message into data of an Ethernet frame when the IP packet data or control message is received from the set-top box 4 and inputs the data to the IP switch 10. do. In addition, the reception data processing device 25 converts, for example, 100 baseT, that is, 100 Mbps data input from the CDMA reception device 24 into 10 baseT data, and inputs the data to the IP switch 10.

In the drawing, reference numeral 26 denotes a central international language processor for controlling the entire apparatus and allocating PIDs for the set-top box 4, assigning transmission frequency data and transmission CDMA codes, and the like. A database that stores the assignable PID, frequency data, and CDMA code data for the set-top box 4, and stores the transmission data processing unit information corresponding to the PID. The database 27 is stored in FIG. The mapping diagram of the stored PID and the corresponding transmission data processing unit is shown.

That is, as can be seen through (b) of FIG. 3, the database 27 has a plurality of PIDs correspondingly assigned to one transmission data processor, and can be used when access is requested from the set-top box 4. As the PID is assigned, the transmission data processing unit to be transmitted is automatically allocated as the PID is assigned, and information about the PID is transmitted to the path processing control unit 18. In addition, among the access data required for the initial connection of the set-top box 4, the public PID is first assigned to be transmitted through the transmission data processing unit 1. Then, the PID allocation rank of the IP address is set according to the data transfer quantity count result received from the data transfer quantity counting unit 29. Then, the PID corresponding to the IP address is sequentially ordered according to the ranking set at the access request of the terminal station. By assigning to, the path of the transmission data processor is automatically reset.

In addition, reference numeral 28 is a network management system (Network Management System) for the system operator to operate and manage the entire satellite network.

On the other hand, Figure 4 is a block diagram showing the configuration of the set-top box 4 in the multimedia satellite communication system.

In FIG. 4, reference numeral 31 denotes an intermediate frequency signal output from the intermediate frequency generator 39, which will be described later, in addition to receiving a high frequency signal transmitted from the central station 100, frequency downconverting, and amplifying low noise. An RF device for up-converting and amplifying high output, 32 is a tuner for frequency converting a high frequency signal output from the RF device 31 and outputting an intermediate frequency, which is an initial state according to a predetermined control of the processor 42 which will be described later. In this case, the tuner is tuned to a predetermined frequency signal to receive a modulated signal of initial access data, and after receiving the access data, to a predetermined frequency signal for receiving traffic data under the control of the processor 42. Tuning will be set.

In addition, reference numeral 33 is a demodulator for demodulating the intermediate frequency signal output from the tuner 32, that is, a QPSK modulated signal, and outputting the TS packet data, and 34 denotes TS packet data output from the demodulator 33. A demultiplexer extracting a TS packet corresponding to the set-top box from the apparatus. The demultiplexer includes a register for storing PID information therein to store a PID applied from the processor 42 to be described later. The TS packet including the PID stored in the register is extracted from the TS packets applied from the demodulator 33 and applied to the processor 42.

In the drawing, reference numeral 35 denotes a network interface card (NIC) that executes an interface with the personal computer 5, which converts an Ethernet frame applied from the processor 42 into an IP packet. In addition to the above), the IP packet applied by the personal computer 5 is converted into an Ethernet frame and applied to the processor 42.

In the figure, reference numeral 36 denotes a serial transmission data frame based on transmission data applied in parallel from the processor 42, and a transmission timing signal applied by the transmission timing generation unit 40 to be described later. And a transmission frame generator for sequentially outputting the transmission data frame. 37 denotes CDMA modulation by mixing the CDMA code applied from the processor 42 to the transmission data output from the transmission frame generation unit 36. A CDMA channel transmitter to be executed, 38 is a modulator for modulating and outputting data output from the CDMA channel transmitter 37, for example, QPSK, 39 is a modulator 38 based on frequency data applied from the processor 42 An intermediate frequency generator converts an output modulation signal into a predetermined intermediate frequency signal.

In the drawing, reference numeral 40 denotes a transmission timing generation unit for generating a transmission timing signal for the transmission frame generation unit 36 under the control of the processor 42, and 41 is an assignment from various data, especially from the central station 100. It is a data memory that stores the control PID and the traffic PID.

In addition, reference numeral 42 denotes a processor for controlling the overall operation of the set-top box 4, which converts the TS packet for the personal computer 5 received from the demultiplexer 34 into an IP packet and converts the packet into an IP packet. In addition to the output box, data from the personal computer 5 input from the network interface card 35 is output to the transmission frame generation unit 36 and transmitted to the central station 100.

In addition, the processor 42 allocates a predetermined CDMA code to the CDMA channel transmitter 37 according to control data transmitted from the central station 100 to the TS packet, and transmits frequency data to the intermediate frequency generator 39. By outputting, the CDMA modulation and frequency modulation on the data to be transmitted to the central station 100 are executed.

The processor 42 tunes and sets the tuner 32 to a predetermined frequency channel for receiving access data (public PID and transmission frequency data and transmission CDMA code data) for initial connection. After the access data is received, the tuner 32 is tuned to a predetermined frequency channel for receiving traffic data.

In addition, the processor 42 registers the control PID and the traffic PID allocated from the central station 100 to the demultiplexer 34 to receive and control the control data and traffic data transmitted from the central station 100.

The operation of the apparatus according to the present invention having the above-described configuration will now be described with reference to the flowchart shown in FIG.

First, there is an initial connection request from the terminal station, and the central station 100 allocates PID, frequency data, and CDMA code data to the terminal station, and makes a call connection with the terminal station through the assigned PID. When traffic data for the terminal station is received through the router 16 (step ST1), the received data is converted into an Ethernet frame by the router 16 and applied to the IP switch 10.

Subsequently, the IP switch 10 transmits the Ethernet frame applied from the router 16 to the path processing controller 18, and the path processing controller 18 applies the data based on the information stored in the memory 17. The transmission data processing path is set according to the IP of the data. Therefore, the Ethernet frame input according to the set transmission data processing path is transmitted through the corresponding transmission data processing unit (step ST2).

At this time, the data transfer amount counting unit 29 counts the number of packets of the transmitted data according to the IP of the data transmitted through the path processing control unit 18. That is, the data amount is counted by counting the number of packets of transmission data corresponding to the IP according to each IP of the data sent to the transmission data processing section through the path processing control section 18 (ST3 step).

Then, the data transfer rate counting unit 29 transmits the transfer rate result counted for each IP to the database 27 through the IP switch 10 (ST4 step).

Subsequently, the database 27 receiving the counted result of the transmission amount according to each IP sets the PID allocation rank according to the IP according to the transmission amount (ST5 step). Therefore, the data processing path setting order is automatically assigned.

Then, when there is an access request from the terminal station (step ST6), under the control of the central international language processor 26, the database 27 requests access to the available PID corresponding to the IP requested to access according to the set PID allocation order. Every time there is an assignment, the allocation is performed sequentially (ST7 step).

Therefore, since the transmission data processing unit is stored in the database 27 corresponding to the PID, the new data is allocated to the transmission data processing path according to the IP. That is, the database 27 transmits the PID information allocated according to the IP to the path processing control unit 18, and the path processing control unit 18 stores the received information in the memory 17, thereby complying with the IP. The transmission data processing path will be reset.

That is, according to the embodiment, when the traffic data to be sent to the terminal station is received, the processing path is automatically set and transmitted according to the IP of the received data, and the transmission amount of the data to be processed is counted based on the IP, According to the result, the transmission data processing path can be reset.

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 transmission amount of the data to be transmitted is counted and the transmission processing path is reset according to the result, thereby preventing the processing load from being concentrated on the arbitrary transmission processing path. In the multi-satellite communication system, the data processing load prevention method of the central station can be realized.

Claims (1)

In a multimedia satellite communication system for allocating service information required when a terminal station requires access, and physically combined with the Internet, generating data input from the Internet into predetermined packet data and transmitting the predetermined packet data to the terminal station. A data receiving step of receiving traffic data from the internet or receiving a control message generated by itself; A transmission path switching step of switching to a transmission data processor corresponding to IP information of the received data; A data transmission processing step of transmitting and transmitting data through the set transmission processing path, A transmission throughput counting step of counting a data amount based on IP information of the data to be transmitted and processed; A transmission throughput storing step of transmitting and storing the counted transmission throughput data to a database; A process path setting priority step for determining a setting priority of the transmission data processor corresponding to the IP information according to the transmission throughput result; And a process path resetting execution step of allocating a terminal station PID according to a process path setting order designated when an access request is made from a terminal station.