KR20000047274A - Channel assignment method for accepting multiple transfer speed in multimedia satellite communication system - Google Patents

Abstract

PURPOSE: A channel assignment method for accepting multiple transfer speed in the multimedia satellite communication system is to provide the communication service of high quality by assigning a suitable CDMA code in accordance with a data transfer speed transmitted from a terminal station. CONSTITUTION: An IP switch(10), connected with a DNS(Domain Name System) server, an E-mail server, a web server, a proxy server, an MSP(Multimedia Service Provider) and a router, switches an IP(Internet Protocol) packet. A transmitting data processing unit(11) processes transmitting data inputted from the IP switch(10) and generates MPEG-2 TS packets. A modulation unit(12) processes the TS packet data output from the transmitting data processing unit(11) in QPSK modulation and outputs an intermediate frequency signal of 70 megahertz. An RF unit(13) carries out frequency up conversion and high power amplification for the intermediate frequency signal output from the modulation unit(12) and outputs it to an antenna(2). A demodulation unit(14) demodulates the intermediate frequency signal inputted from the RF unit(13). A CDMA receiving unit(15) executes CDMA demodulation for the frequency-modulated CDMA modulation data inputted from the demodulation unit(14). A received data processing unit(16) processes the data inputted from the CDMA receiving unit(15).

Description

Channel Assignment Method to Accommodate Multiple Data Rates in Multimedia Satellite Communication System

The present invention relates to a channel allocation method of a multimedia satellite communication system. In particular, the present invention relates to a channel allocation method in a multimedia satellite communication system in which a CDMA code can be allocated according to a transmission speed of data transmitted from a terminal station requiring access. It relates to a channel allocation method to accommodate.

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

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, first, the central station 1 supplies various communication resource 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 to provide 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.

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 1 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. 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 communication resources, that is, the control PID, the traffic PID, the channel frequency, and the CDMA code for the set-top box 4 requesting access are checked. Will be allocated.

At this time, when the central station 1 allocates the CDMA code, the control means of the central station 1 first transmits the CDMA code data to be allocated to the receiving data processing apparatus provided in the central station 1, and sets it in the receiving data processing apparatus. The CDMA receiving apparatus sets each channel based on the CDMA code data received from the control means, and sends the set result information back to the control means.

Therefore, the control means of the central station 1 receives the actual CDMA code data set in the CDMA receiving apparatus, generates transmission data through the transmission data processing apparatus based on this, and sends it to the set-top box 4 which has requested the access. Will be done.

Therefore, the set-top box 4 requesting access sets the communication resources transmitted and received from the central station 1, that is, the control PID, the traffic PID, the channel frequency, and the CDMA code in the device. ) Data transmission and reception.

However, when the central station 1 allocates the CDMA code to the set-top box 4 that requires access as described above, the channel and the CDMA are not considered without considering the transmission speed of the data transmitted from the set-top box 4. Code and so on. Therefore, since the required allocation channels are different depending on the transmission rate of the data transmitted and received with the set-top box 4, the channel assignment not considering the transmission rate of the transmitted and received data is used to transmit data through the assigned channel. As the data is broken or errors occur, it becomes inefficient communication in the satellite communication which must provide reliable high quality communication service.

Accordingly, the present invention has been made in view of the above circumstances, and it is possible to provide a high-quality communication service by allocating an appropriate CDMA code according to a transmission speed of data transmitted from a terminal station requiring access. An object of the present invention is to provide a channel allocation method for accommodating multiple transmission rates in a system.

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

2 is a block diagram showing the configuration of a central station 100 executing a channel assignment method for accommodating multiple transmission rates according to a first embodiment of the present invention.

3 is a map table configuration diagram of the reception data processing apparatus state information storage unit 20 of FIG.

4 is a map table configuration diagram of the reception data processing device channel information storage unit 21 of FIG.

5 is a map table configuration diagram of the CDMA receiver state information storage section 22 of FIG.

FIG. 6 is a map table configuration diagram of the CDMA receiver channel information storage section 23 of FIG.

7 is an operation flowchart for explaining a channel allocation method for accommodating multiple transmission rates according to the first embodiment of the present invention.

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

1: central station 2, 3: antenna

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

6: satellite 10: IP switch

11 transmission data processing device 12 modulation device

13 RF device 14 Demodulation device

15: CDMA receiving device 16: Receiving data processing device

17: central international language processor 18: network management system (NMS)

19: Database

20: Receive data processing device status information storage unit

21: Channel information storage unit of the receiving data processing device

22: CDMA receiver device status information storage unit 23: CDMA receiver device channel information storage unit

In the multimedia satellite communication system according to the present invention for realizing the above object, the channel allocation method for accommodating multiple transmission rates stores the channel setting state of the reception data processing apparatus according to the data transmission rate as a map table, and based on the access, A central station of a multimedia satellite communication system for allocating a CDMA code to a requested set top box, comprising: a data receiving step of receiving access request data from the set top box, and a transmission for determining a transmission speed of data transmitted from the set top box; A speed determining step, a CDMA channel searching step of searching the map table based on the determined transmission rate of the received data and searching for a usable CDMA channel suitable for the transmission rate; If a suitable and available CDMA channel exists, assign that CDMA channel. It characterized in that it comprises a CDMA channel assignment step.

That is, according to the present invention having the above-described configuration, by allocating the CDMA code according to the transmission rate of data transmitted and received in the multimedia satellite communication system, it is possible not only to increase the transmission efficiency of the system but also to improve the reliability of the communication service.

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

2 is a block diagram showing the configuration of a central station 100 that executes a channel allocation method for accommodating multiple transmission rates in a multimedia satellite communication system according to a first embodiment of the present invention.

In Fig. 2, reference numeral 100 denotes a central station for executing and controlling the CDMA code allocation method according to the present invention, and 10 denotes an IP switch for switching an Internet Protocol packet, which is not shown in this IP switch 10. Domain Name System (DNS) server, E-mail server, Web (WEB) server, proxy server, multimedia service provider (MSP), router, etc. are combined to send and receive data from multimedia service network. In particular, the router performs 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 Ethernet frame data, and transmits the data from the central station 100 to the Internet. The Ethernet frame is converted into an IP packet.

In the figure, reference numeral 11 denotes a transmission data processing apparatus which processes transmission data input from the IP switch 10 to generate, for example, an MPEG-2 TS packet, and 12 denotes an output from the transmission data processing apparatus 11. 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 13 frequency upconverting and high output amplifying an intermediate frequency signal output from the modulator 12. 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 figure, reference numeral 14 denotes a demodulation device for demodulating an intermediate frequency signal input from the RF device 13, and 15 denotes CDMA demodulation of CDMA modulated data input by frequency demodulation in the demodulation device 14. A CDMA receiving device for outputting packet data, 16 is a receiving data processing device for processing data input from the CDMA receiving device 15, wherein the receiving data processing device 15 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 16 converts, for example, 100 baseT, that is, 100 Mbps data input from the CDMA reception device 15 into 10 baseT data and inputs the data to the IP switch 10.

In the figure, reference numeral 17 controls the entire apparatus of the central station 100, and the reception data processing apparatus state to be described later with respect to the access request data of the set-top box 4 received through the IP switch 10. CDMA that matches the transmission speed of the received data by searching the information storage unit 20, the received data processing device channel information storage unit 21, the CDMA receiving device state information storage unit 22, and the CDMA receiving device channel information storage unit 23. A central international language processor for allocating code data and setting the same on the CDMA receiver 15, 18 is a network management system for operating and managing an entire satellite network by a system operator, and 19 is a set-top box. It is a database for storing the assignable PID, frequency data, and CDMA code data for 4) as well as billing information for the subscriber.

Reference numeral 20 denotes a reception data processing apparatus state information storage unit 20 as a map table in which CDMA carriers, i.e., transmission rates, are matched with the apparatuses of the reception data processing apparatus 16, and are shown in FIG. As described above, the internal configuration is a number 31 of each receiving data processing apparatus, the first byte of which is a spare area 32, and one bit of the receiving data processing apparatus is present or not (34), That is, the allocated state is represented by "1" or "0", and the second byte 39 is configured to store a transmission rate suitable for data processing, that is, a carrier code.

Further, reference numeral 21 denotes a reception data processing apparatus channel information storage unit 21 as a map table in which the channel assignment state of the reception data processing apparatus 16 is stored as information data, which is shown in FIG. The eight channel assignment states of eight bits allocated to the data processing device 16 store 64 channel assignment states of eight bytes.

In addition, reference numeral 22 denotes a CDMA receiver state information storage unit 22 as a map table in which the overall system state information of the CDMA receiver 15 is stored as data. First, as shown in FIG. The system status is composed of 4 bytes, 1 byte is the total number of receiving data processing devices stored in the system as data, the second 1 byte is the service status of the receiving data processing device, and the third 1 byte is the corresponding receiving data. The total number of CDMA receivers currently in use in the processing unit, the fourth 1 byte is the total number of CDMA receivers housed in the receiving data processing unit as data, and the remainder is the number corresponding to each receiving data processing unit. The information of eight CDMA receivers corresponding to each received data processing apparatus is composed of 8 bytes of 1 byte each for 40 received data processing apparatuses. The state information of the CDMA receiver is stored.

In Fig. 2, reference numeral 23 denotes a CDMA receiver device channel information storage unit 23 as a map table in which the allocation status of channels allocated to each CDMA receiver device constituting the CDMA receiver 15 is stored. As shown in FIG. 1, one byte of each CDMA receiver stores a service state of the CDMA receiver, and the remaining eight bytes store a channel allocation state of one byte for each channel. Eight CDMA receivers are configured with eight channels, and 40 receive data processing devices have this configuration.

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

First, the network management system 18 of the central station 100 is a CDMA for transmitting control messages to various satellite resources, such as the central station 100, which is required when the set-top box 4 requests access to the central station 100. Code, channel frequency data, and PID are assigned to the set top box (4).

That is, an Ethernet frame including the CDMA code, channel frequency data, control PID, and traffic PID is generated and transmitted to the transmission data processing apparatus 11 through the IP switch 10.

Subsequently, the transmission data processing apparatus 11 converts the Ethernet frame transmitted from the IP switch 10 into an IP packet and converts it into a TS packet, and transmits the TS packet to the modulator 12 and the RF device 13. It is transmitted to the set-top box (4) through.

On the other hand, in the set-top box 4, the CDMA code data and channel frequency used when registering the information service PID received from the central station 100 and requesting a call connection to the received access data, that is, the central station 100 The data will be saved.

When the access request for the Internet, that is, the call connection request, is input from the personal computer 5 in the above state, the set-top box 4 is based on the subscriber information, that is, the subscriber ID, password, subscriber address, and the like. After a predetermined control message is generated, the CDMA code data and channel frequency data transmitted from the central station 100 are allocated to the CDMA channel transmitter and the intermediate frequency generator to access the central station 100. In addition, the control message relating to the access request includes the transmission rate information selected by the subscriber from the personal computer 5, for example, designating the transmission rate according to the modem.

On the other hand, in the central station 100, the control message sent from the set-top box 4 is input to the demodulation device 14 through the RF device 13, and the access control message is demodulated assigned for the access. It is input to the receiving data processing device 16 through the device 14 and the CDMA receiving device 15. Then, the reception data processing device 16 generates an Ethernet frame based on the control message and applies it to the central international language processor 17 through the IP switch 10.

Subsequently, when the access request is input through the above-described process (ST1 step), the central international language processor 17 first grasps the transmission speed of the control message. That is, the transmission speed of the transmission data is determined by referring to the transmission speed of the modem included in the content of the control message (step ST2).

Then, the central international language processor 17 compares the subscriber IP and password included in the control message with the subscriber information stored in the database 19 to determine whether the current subscriber has a legitimate access request.

In this case, if it is determined that the subscriber is a legitimate subscriber, the database 19 is searched to determine whether there is a currently available PID, and the control PID and the traffic PID are allocated to the set-top box 4. Then, in order to allocate CDMA code data to the set-top box 4, the receiving data processing apparatus state information storage unit 20 is searched to find a receiving data processing apparatus suitable for the transmission speed of the received message (ST3). step). That is, in the map table shown in FIG. 3, the number of the receiving data processing apparatus having the CDMA carrier most suitable for the transmission rate of the received message is found.

Therefore, when there is a reception data processing device most suitable for the transmission speed of the received message through the above-described process (step ST4), the reception data processing device channel information storage unit 21 as shown in FIG. Through searching the channel information assigned to the receiving data processing device having the transmission rate of the received message through to find the available channel frequency (ST5 step).

If there is an available frequency channel among the channels allocated to the received data processing apparatus by searching the received data processing apparatus channel information storage unit 21 (step ST6), the central international language processor 17 performs the frequency of the available channel. Will be specified.

In addition, the central international language processor 17 is a CDMA receiving apparatus 15 corresponding to a receiving data processing apparatus suitable for the transmission rate of the receiving message through the CDMA receiving apparatus state information storing unit 22 as shown in FIG. Search status information (step ST7).

That is, the number of CDMA receivers and the number of CDMA channels currently in use are recognized, and the state information for each of the CDMA receivers is retrieved. The state information of the CDMA receiving apparatus is stored as, for example, "0" in the standby state, "1" in the service state, "2" in the maintenance state, and "3" in the unset state.

Therefore, if there is a CDMA receiver available by searching the CDMA receiver state information storage unit 22 as described above (ST8 step), the CDMA receiver device channel information storage unit 23 as shown in FIG. The channel information is retrieved (step ST9).

That is, in FIG. 6, it is determined whether there is an available channel in the unassigned state (“0” state) among the CDMA receivers in which the CDMA receiver device service state is in standby state “0” (step ST10). If there is an available channel that has not yet been assigned, it will specify that available channel.

Therefore, the central international language processor 17 generates transmission data, that is, an Ethernet frame, based on the CDMA code data of the designated CDMA channel, transmits it to the CDMA receiving apparatus 15 through the IP switch 10, and sets it. Sending and setting the designated channel frequency to the reception data processing device 16, and generating transmission data including the above data, that is, an Ethernet frame, and sending it to the transmission data processing device 11 through the IP switch 10. By transmitting to the set top box 4, a CDMA code is assigned to the set top box 4 that has requested access (step ST11).

That is, according to the above embodiment, the CDMA code and the channel frequency are allocated according to the transmission speed of the data transmitted and received in the multimedia satellite communication system, thereby increasing the transmission efficiency of the system and improving the reliability of the communication service. .

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, by allocating a communication resource suitable for the transmission speed of the transmission data from the terminal station in the multimedia satellite communication system, the transmission efficiency of the system can be improved and the reliability of the multimedia satellite communication service can be improved. do.

Claims (5)

In the central station of the multimedia satellite communication system for storing the channel setting state of the receiving data processing device according to the data transmission rate as a map table, and allocating communication resources to the set-top box requesting access, A data receiving step of receiving access request data from the set top box; A transmission speed grasping step of determining a transmission speed of data transmitted and received from the set top box; A communication resource searching step of searching the map table based on the identified transmission data rate and searching for available communication resources suitable for the transmission rate; And a communication resource allocating step of allocating the communication resource when there is a communication resource suitable for the transmission rate of the received data as a result of searching the map table. Acceptable channel assignment method. The method of claim 1, The communication resource searching step is a channel allocation method for accommodating multiple transmission rates in a multimedia satellite communication system, characterized in that for searching for a receiving data processing device having a data transmission rate most similar to the transmission speed of the received data. The method of claim 2, A channel assignment method for accommodating multiple transmission speeds in a multimedia satellite communication system, characterized in that a usable frequency channel is searched among frequency channels allocated to a reception data processing apparatus having a data transmission rate most similar to the transmission speed of the received data. . The method of claim 2, A channel accommodating multiple transmission rates in a multimedia satellite communication system characterized by searching for an available CDMA receiving apparatus among CDMA receiving apparatuses combined with a receiving data processing apparatus having a data transfer rate most similar to the transmission rate of the received data. Assignment method. The method of claim 4, wherein And retrieving available CDMA channels by searching channel information in the usable CDMA receiving apparatus.