KR20000041828A - Manager for subscriber information in multimedia satellite communication system - Google Patents

Abstract

PURPOSE: A manager for a subscriber information in a multimedia satellite communication system is provided to search a traffic process identification(PID)/thread identification(TID) information of a corresponded terminal in a short time, based on an internet protocol(IP) address, when traffic data is transmitted from a transmission data processor. CONSTITUTION: A manager for a subscriber information in a multimedia satellite communication system, in which generates timings(TS) packet data based on an internet protocol(IP) packet data received from the IP packet network, to transmit the generated data to a terminal, and uses process identification(PID)/thread identification(TID) information. The manager comprises a transmission data processor and a central office controller. The transmission data processor is composed of a subscriber information storage(53), an IP packet controller(52), a timings(TS) packet generator(55). The subscriber information storage(53) stores the PID/TID information, responding to an IP address. The IP packet controller(52) manages the storage(53), and reads the PID/TID information, to output the read information, and uses the IP address as a memory address to the storage(53). The TS packet generator(55) generates the TS packet data, based on the outputted information and received IP packet data. The central office controller supplies the transmission data processor with the IP address, with a PID/TID assigned to each terminal.

Description

Subscriber information management device in multimedia satellite communication system.

The present invention relates to a multimedia satellite communication system, and more particularly, to a subscriber information management apparatus in a multimedia satellite communication system for managing subscriber information by mapping and storing traffic PID / TID information corresponding to an IP address in a central station.

At present, researches on satellite communication systems using satellites are rapidly progressing as wireless communication technologies are developed. In recent years, general subscribers can access the Internet network using satellite communication networks, and multimedia data can be accessed through satellite communication networks. A multimedia satellite communication system that can transmit and receive is under study.

1 is a block diagram schematically showing the configuration of a central station in a multimedia satellite communication system.

In FIG. 3, reference numeral 1 denotes an IP switch for switching an Internet Protocol Packet. The IP switch 11 includes a Domain Name System (DNS) server 11, an E-mail server 12, and a web ( The WEB server 13, the proxy server, the multimedia service provider (MSP), the router 16, and the like are 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 1 and the Internet, which converts an IP packet input from the Internet into the central station 1 into data of an Ethernet frame and converts the data from the central station 1 to the Internet. Ethernet frame sent to IP packet is converted into IP packet.

In the figure, reference numeral 17 denotes a transmission data processing apparatus for processing transmission data input from the IP switch 10 to generate, for example, an MPEG-2 TS packet, and 18 is output from the transmission data processing apparatus 16. A modulator for outputting an intermediate frequency signal of, for example, 70 MHz by performing quadrature phase shift keying (QPSK) modulation on TS packet data, and a frequency upconversion and high output amplification of the intermediate frequency signal output from the modulator 17 It is an RF device for outputting to the antenna (2), the high-frequency signal received through the antenna (2) down-frequency conversion and low noise amplification output.

In the drawing, reference numeral 20 denotes a demodulation device for demodulating an intermediate frequency signal input from the RF device 19, and 21 denotes CDMA demodulation of CDMA modulation data input by frequency demodulation in the demodulation device 20. A CDMA receiving device for outputting packet data, 22 is a receiving data processing device for processing data input from the CDMA receiving device 21, wherein the receiving data processing device 22 is an IP packet data from the set-top box (4) If the control message is received or converted to the data of the Ethernet frame is input to the IP switch 10. In addition, the reception data processing device 22 converts, for example, 100 baseT, that is, 100 Mbps data input from the CDMA reception device 21 into data of 10 baseT, and inputs the data to the IP switch 10.

In the drawing, reference numeral 23 denotes a central international language processor which controls the entire apparatus of the central station 1, and also allocates PIDs to the set-top box 4, transmit channel frequencies and CDMA codes for transmission. 24 is a network management system for the system operator to operate and manage the entire satellite network, and 25 is a PID, frequency data and CDMA code data that can be allocated to the set-top box 4, Database that stores billing information, etc.

That is, the central station 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). In addition, 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 through a TDM scheme. Then, CDMA modulation data received from the set-top box is received and IP packets are generated based on this, and the corresponding IP packets are transmitted to the Internet.

In addition, the transmission data processing device 17 is configured to reconstruct the MPEG-2 TS packet after configuring the IP packet type traffic data and M & C (Monitering & Controling) control data input through the IP switch into a PS packet. In the case of M & C control data, the IP packet data has PID / TID information assigned to the terminal station to which data transmitted from the central station should be received, and the PS to be assigned to the terminal station based on this information. The PID of the packet header and the TID of the MPEG-2 TS are set.

However, in the case of traffic data, only the IP address of the terminal station is transmitted. Therefore, in order to configure the traffic data into the PS packet / MPEG-2 TS packet in the transmission data processing apparatus 17, the traffic allocated based on the IP address is used. Search PID / TID information.

Therefore, the central station needs to prepare a mapping table between the IP address and the traffic PID / TID.

Accordingly, the present invention was created in view of the above circumstances, and when the traffic data is transmitted from the transmission data processing unit, the multimedia satellite capable of finding the traffic PID / TID information of the terminal station in a short time based on the IP address. Its purpose is to provide a subscriber information management device in a communication system.

1 is a block diagram showing the internal configuration of a central station in a general multimedia satellite communication system.

2 is a block diagram showing a configuration of a transmission data processing section to which the present invention is applied;

3 is a memory map diagram of a subscriber information storage unit according to a first embodiment of the present invention;

4 is an operation flowchart of a transmission data processing unit including the subscriber information storing unit shown in FIG.

5 is a memory map diagram of a subscriber information storage unit according to a second embodiment of the present invention;

6 is an operation flowchart of a transmission data processing unit including the subscriber information storage unit shown in FIG.

*** Explanation of symbols for the main parts of the drawing ***

50: Ethernet interface, 51: input buffer,

52: IP packet controller, 53: subscriber information storage unit,

54: PS packet generation unit, 55: TS packet generation unit.

The subscriber information management apparatus in the multimedia satellite communication system according to the present invention for realizing the above object generates TS packet data based on the IP packet data received from the IP packet network and transmits the TS packet data to the terminal station, and the data between the central station and the terminal station. A multimedia satellite communication system configured to use PID / TID information for identification, comprising: subscriber information storage means for storing PID and TID information corresponding to an IP address of IP packet data received from an IP packet network, and storing the subscriber information; IP packet control means for managing the means and reading and outputting PID and TID information from the subscriber information storage means based on the IP address of the received IP packet, and outputting the received IP packet data and the IP packet control means. TS packet generation to generate TS packet data based on PID and TID information Transmission data processing means having means; and central international language means for supplying PID and TID assigned to each terminal station with the IP address to the transmission data processing means, wherein the IP packet control means is an IP address. Is used as a memory address for the subscriber information storing means.

In addition, a plurality of C-class IP address is assigned to provide a service for the IP packet network for each terminal station, but generates TS packet data based on the IP packet data received from the IP packet network, and transmits to the terminal station, A multimedia satellite communication system configured to use PID / TID information for data identification between a central station and a terminal station, comprising: subscriber information storage means for storing TID and PID information corresponding to an IP address, and storing the subscriber information. The means comprises a first storage area corresponding to the IP address of each C class and a second storage area for distinguishing the class of the IP address, wherein each first storage area is associated with the lower 1 byte of the IP address. A predetermined number of bits to indicate the class containing the corresponding IP address are used as the address. Corresponding PID and TID information is stored, the second storage area stores information of the upper 3 bytes of the IP address corresponding to predetermined address data, and the upper 3 bytes of the received IP address is stored from the second storage area. And an IP packet control means for reading the PID and TID information from the first storage area by distinguishing the class of the received IP address based on the address data of the subscriber information storage means corresponding to the read IP address. It is characterized by.

That is, according to the above, by quickly finding the traffic PID / TID information corresponding to the IP address, the data processing speed can be improved.

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

2 is a block diagram showing an internal configuration of a transmission data processing section to which the present invention is applied.

In the figure, reference numeral 50 denotes an Ethernet interface that generates and outputs an IP packet based on an Ethernet frame input from an IP switch of a central station, and converts and outputs 100baseT data into 10baseT data. An input buffer for sequentially storing the IP packet data output through the interface 50, 52 determines the type of the input data based on the header of the IP packet data stored in the input buffer 51, and the determined result To control packet generation of the PS packet generation unit 54 and the TS packet generation unit 55 to be described later, and also to control the transmission data processing unit based on the control data applied from the Ethernet interface 50. IP packet controller. Although not specifically shown in the figure, the IP packet controller 52 checks the state of each component of the transmission data processing unit and sends the state information to the central station.

Reference numeral 53 is a subscriber information storage unit for storing traffic PID / TID assigned to each terminal station, which maps and stores the traffic PID and TID corresponding to the IP address of each terminal station.

Reference numeral 54 denotes a PS packet generation unit that generates a PS packet (Private Section Packet) based on data input from the IP packet controller 52, and 55 denotes a PS packet input from the PS packet generation unit 54. MPEG-2 TS packets are generated based on the data and the PID (control PID, traffic PID, or information service PID) applied from the IP packet controller 55 and the traffic data stored in the input buffer 51. TS packet generation unit for outputting.

That is, the transmission data processor generates an IP packet based on the Ethernet frame applied from the central station, determines the type of data received from the IP header of the IP packet, and determines the type of traffic data based on the determined data type. In this case, the PID / TID information stored in the subscriber information storage unit 53 is read and the MPEG-2 TS packet is generated.

3 is a memory map diagram of the subscriber information storage unit 53 according to the embodiment of the present invention.

In general, the IP address is 32 bits, which is divided into three classes, A class, B class, and C class, depending on the byte size of the address distributed to the user. Here, class A can fix the upper 1 byte and distribute the lower 3 bytes among 4 bytes of IP address, and class B can fix the upper 2 bytes and distribute the lower 2 bytes. The upper 3 bytes are fixed and the lower 1 byte can be distributed and used. In addition, the PID / TID data for traffic has a length of 3 bytes.

Thus, when the subscriber information storage unit 53 shown in FIG. 3 processes the channel setting message in the IP packet controller, the subscriber information storage unit 53 uses the IP address inside the data as the address of the subscriber information storage unit 53. It stores and manages address and traffic PID / TID information. Therefore, since all of the IP addresses are 32 bits and have a data length of 4 bytes, this is formed of a memory having a capacity of 2 ³² x 32 (4G x 4B), that is, 16 GB.

Next, an operation of the transmission data processing unit having the subscriber information storage unit 53 configured in the above-described memory map form will be described with reference to the flowchart shown in FIG.

First, when a subscriber requests a call, the central station checks the identity of the subscriber based on the subscriber's IP and password, and if the subscriber is determined to be a legitimate subscriber, retrieves the currently available PID / TID and assigns it to the subscriber. In this case, the central station generates an Ethernet frame for transmitting usable PID / TID data and transmits it to the transmission data processing unit through the IP switch.

Subsequently, when an Ethernet frame is input through the IP switch (ST1), the Ethernet interface 50 generates and outputs an IP packet based on the Ethernet frame, and these IP packets are sequentially stored in the input buffer 51. Will be.

On the other hand, the IP packet controller 52 determines the type of the input IP packet data by determining the header of the IP packet stored in the input buffer 51, which is input IP through the header of the input IP packet It is determined whether the packet data is control data or traffic data, and then the message ID stored at the beginning of the IP packet is analyzed to determine whether the packet data is control data for call connection / disconnection of the terminal station or traffic PID / TID data allocated to the terminal station. It is determined whether or not the M & C control data relating to (ST2).

At this time, if the data type analysis result of the IP packet determines that the input IP packet is the M & C control data, the IP data stored in the input buffer 51 is read, and the IP address and traffic PID / TID are included in the IP data. The data is stored.

Thereafter, the IP packet controller 52 searches for the same address as the IP address of the IP data read from the subscriber information storage unit 53 (ST3), and inputs the IP address together with the IP address to the corresponding address of the subscriber information storage unit 53. Stored traffic PID / TID data (ST4).

That is, when the IP address read out from the IP packet is "13579AB5", the traffic PID / TID data is stored where the address of the subscriber information storage unit 53 is "13579AB5".

On the other hand, if it is determined that the data type of the IP packet is not M & C control data in step ST2, the IP packet controller 52 performs a normal control operation according to the type of the data (ST5).

That is, in the above-described embodiment, the traffic PID / TID data is stored in the subscriber information storage unit 53 at the same address as the IP address by using the IP address as the address of the subscriber information storage unit 53. Compared to the time taken to search for the IP address stored arbitrarily in the storage unit 53, the time taken to search for the traffic PID / TID data of the received IP packet can be shortened by searching the data corresponding to the IP address.

However, according to the above, there is a problem in that a large capacity memory capable of accommodating all IP addresses having a data length of 32 bits is required.

Accordingly, the second embodiment according to the present invention was created in view of the above circumstances, and provides a data management apparatus in a multimedia satellite communication system that can reduce memory capacity by storing IP addresses by IP class. The purpose is.

5 is a memory map diagram of the subscriber information storage unit 53 according to the second embodiment of the present invention, which is capable of accommodating a maximum of 3,000 terminal stations at once in a multimedia satellite communication system. Since one C class can accommodate 256 terminal stations by specifying an address, a total of 12 C classes are required (256 x 12 = 3,072).

That is, the IP address of each class (1-12) is 32 bits, i.e. 4 bytes, and the upper 3 bytes of the 4 bytes are fixed. For example, in the case of IP class 1, 3 bytes of "165.138.2" are fixed, and only the lower 1 byte is changed to "0-255". In the case of IP class 2, the upper 3 bytes of "129.254.232" It is fixed and only the lower 1 byte is changed to "0 to 255".

Therefore, the transmission data processing unit having the subscriber information storage unit 53 configured in the form of a memory map as shown in FIG. 5 stores the upper 3 bytes of data corresponding to each of the classes 1 to 12 separately, and inputs the IP. After reading the information on the class from the packet, the IP address is searched for in the corresponding class of the subscriber information storage unit 53. Similar to the memory map shown in FIG. 3, the IP address of the subscriber information storage unit 53 is read. This corresponds to the address.

However, in the first embodiment, the entire IP address of 4 bytes is used as the address of the subscriber information storage unit. In this embodiment, however, the address of the subscriber information storage unit can be designated as 12 IP addresses of the lower 1 byte. Compared to the embodiment, the memory capacity is reduced.

Next, the operation of the transmission data processing section including the subscriber information storage section 53 composed of the above memory map will be described with reference to the flowchart shown in FIG.

First, when an Ethernet frame is input through an IP switch, the Ethernet interface 50 generates and outputs an IP packet based on the Ethernet frame (ST1), and these IP packets are sequentially stored in the input buffer 51. Will be.

Meanwhile, the IP packet controller 52 determines the type of the IP packet data input by determining the header of the IP packet stored in the input buffer 51. At this time, it is determined whether the input IP packet data is M & C control data. It is confirmed (ST2).

At this time, if the data type analysis result of the IP packet is determined that the input IP packet is M & C control data, the IP address data is read from the IP data stored in the input buffer 51 and based on the fixed 3 bytes of IP address data. Then, the corresponding class of IP address is searched (ST53). That is, the subscriber information storage unit 53 searches for the corresponding class based on the address where the same information as the upper 3 bytes of the IP address exists from the address area storing the class information. For example, when the upper 3 bytes of information is "165.138.2", since this is the same as the data stored in the C001 address, the IP packet controller 52 recognizes that the received IP address corresponds to IP class 1.

Subsequently, the IP packet controller 52 searches for the same address as the lower 1-byte data of the IP address in the corresponding class area of the subscriber information storage unit 53 (ST52), and stores the IP at the corresponding address of the subscriber information storage unit 53. The traffic PID / TID data input together with the address is stored (ST55). For example, when the corresponding class area is IP class 1 and the lower 1 byte data of the IP address corresponds to "0FF", the IP packet controller 52 recognizes that the received 4 byte IP address is "165.138.2.255". Traffic PID / TID data is stored at the corresponding address, that is, "0FF".

On the other hand, if the result of the data type analysis of the IP packet in step ST2 determines that the input IP packet is not the M & C control data, the normal control processing is performed so that the IP data stored in the input buffer 51 corresponds to the analyzed data type. It is performed (ST56).

In other words, since the IP address is mostly composed of a fixed upper 3 byte and a variable lower 1 byte, the IP class data is set based on the upper 3 bytes, and the subscriber information storage unit is based on the lower 1 byte. The address 53 is used to map the IP address and the traffic PID / TID data.

Therefore, the subscriber information storage unit can be configured with a small amount of memory, and the traffic PID / TID information corresponding to the IP address can be found in a short time, thereby improving the processing speed of the data.

In addition, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the technical scope of the present invention.

As described above, according to the present invention, it is possible to realize the subscriber information management apparatus in the multimedia satellite communication system which can improve the processing speed of data by quickly finding the traffic PID / TID information corresponding to the IP address. .

Claims (2)

In the multimedia satellite communication system in which TS packet data is generated and transmitted to a terminal station based on IP packet data received from an IP packet network, and PID / TID information is used to identify data between the central station and the terminal station. Subscriber information storage means for storing PID and TID information corresponding to an IP address of IP packet data received from an IP packet network, and managing the subscriber information storage means and based on the IP address of the received IP packet. IP packet control means for reading and outputting PID and TID information from the storage means, and TS packet generation means for generating TS packet data based on the received IP packet data and the PID and TID information output from the IP packet control means. Transmission data processing means provided; And a central international language means for supplying the PID and the TID assigned to each terminal station to the transmission data processing means together with its IP address. And said IP packet control means uses an IP address as a memory address for said subscriber information storage means. Provides IP packet network access service for each terminal station by assigning multiple IP addresses of C class, but generates TS packet data based on IP packet data received from IP packet network and transmits it to the terminal station. In the multimedia satellite communication system to use the PID / TID information for data identification between terminal stations, And subscriber information storage means for storing TID and PID information corresponding to the IP address, The subscriber information storage means comprises a first storage area corresponding to the IP address of each C class and a second storage area for distinguishing the class of the IP address, and each first storage area is configured to include an IP address. PID and TID information corresponding to the IP address is stored using a predetermined number of bits for indicating a class including the lower 1 byte and the corresponding IP address, and the second storage area corresponds to the predetermined address data. The upper 3 bytes of the IP address are stored. Read the upper 3 bytes of the received IP address from the second storage area, and classify the received IP address class based on the address data of the subscriber information storage means corresponding to the read IP address, and then enter the PID from the first storage area. And an IP packet control means for reading TID information.