KR100732857B1 - Method and system for controlling satellite digital multimedia broadcasting service by using pilot signal - Google Patents

Abstract

Disclosed are a method and system for controlling satellite DMB service using a pilot signal. The method may include transmitting, by the satellite DMB management server, service control information to be transmitted to a repeater to an earth station, wherein the earth station inserts the service control information into a satellite DMB signal and transmits the service control information to a DMB satellite. Transmitting a satellite DMB signal including control information to a repeater, and receiving, by the repeater, a TDM signal of the satellite DMB signal to extract the service control information and interpreting the extracted service control information; Characterized in that. Therefore, the satellite DMB management server can control the satellite DMB service at a relatively low communication cost by interpreting a signal received from the DMB satellite without separately transmitting service control request information to the repeater.

Satellite DMB, CDM, TDM, Pilot Signals

Description

Method and system for controlling satellite digital multimedia broadcasting service using pilot signal {METHOD AND SYSTEM FOR CONTROLLING SATELLITE DIGITAL MULTIMEDIA BROADCASTING SERVICE BY USING PILOT SIGNAL}

1 is a configuration diagram of a general satellite DMB system.

2 is a system block diagram for controlling a conventional satellite DMB service.

3 is a system block diagram for satellite DMB service control using a pilot signal according to an embodiment of the present invention.

4 is a configuration diagram of a CDM frame of the satellite DMB system according to an embodiment of the present invention.

5 is a configuration diagram of a TDM frame of a satellite DMB system according to an embodiment of the present invention.

6 is a block diagram showing the relationship between the air defense and the auxiliary broadcast according to an embodiment of the present invention.

7 is a configuration diagram of a frame and a super frame of a pilot signal according to an embodiment of the present invention.

8 is a block diagram of a ground auxiliary repeater according to an embodiment of the present invention.

9 and 10 are flowcharts of a method for controlling satellite DMB service using a pilot signal according to an embodiment of the present invention.

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

10: satellite DMB management server 20: earth station (satellite DMB broadcasting center)

30: DMB satellite 40: ground auxiliary repeater (Gap Filler)

50: receiving terminal 60: content supply server

110: CDM modulator 120: TDM multiplexer

130: TDM demultiplexer 210: 1 super frame

220: 1 frame 230: D51

The present invention relates to a method and system for controlling satellite DMB service. More particularly, the present invention relates to a satellite DMB service control method and system. The present invention relates to a satellite DMB service control method and system using a pilot signal for analyzing a pilot signal and extracting the service control information to control a satellite DMB service according to the service control information.

Satellite digital multimedia broadcasting (hereinafter referred to as 'satellite DMB') is a microwave that uses a satellite transmission facility to receive broadcast program signals such as digital video, audio, and data for direct public reception. Broadcast in the band. In other words, it is a new concept of satellite broadcasting service which mainly aims at a mobile service capable of watching multi-channel multimedia broadcasting anytime and anywhere through a portable terminal or a vehicle terminal.

In the case of satellite DMB, the 25 Mhz band on the 2.6Ghz upper band S band is used, and the system E scheme using the code division multiplex (CDM) method is followed.

1 is a configuration diagram of a general satellite DMB service system, and FIG. 2 is a system block diagram for controlling a conventional satellite DMB service.

 1 and 2, the satellite DMB system includes a satellite DMB management server, a performance facility, an earth station, a DMB satellite, a terrestrial auxiliary relay facility (hereinafter referred to as a repeater) and a subscriber receiver terminal. It is a broadcasting system that transmits multimedia contents from the earth station broadcasting center to the satellite by using the CDM transmission method, and the receiving terminal receives directly from the DMB satellite or the shaded area such as a room with weak signal through a repeater. .

Earth stations to DMB satellites transmit CDM and TDM signals in the 13 GHz or 14 GHz band over the uplink. The CDM signal transmitted to the satellite is frequency-converted to 2.6 GHz and transmitted directly to the receiver, and the TDM signal is frequency-converted to 11 GHz or 12 GHz and transmitted to the repeater. .

In particular, the satellite DMB management server transmits information to be delivered to the repeater by communicating with the repeater wired or wirelessly through a network. Therefore, the repeater controls the satellite DMB service, such as controlling the channel (On) / off (Off) according to the information received from the satellite DMB management server.

However, when all the repeaters must be controlled in the same manner, there is a problem in that the cost of communication costs is large because the satellite DMB management server must transmit the same information as the number of repeaters.

The present invention has been made to solve the above problems, an object of the present invention is the satellite DMB management server transmits the service control information for the control of the satellite DMB service to the earth station, the earth station transmits the service control information to the DMB satellite By transmitting the CDM signal or the TDM signal pilot signal to be transmitted to the repeater, the repeater analyzes the TDM signal received from the DMB satellite to extract the service control information, and executes control of the service corresponding to the extracted service control information. To provide a satellite DMB service control method and system using a pilot signal.

Satellite DMB service control method using a pilot signal according to the present invention for achieving the above object, A-1) the satellite DMB management server transmitting the service control information to the relay to the earth station; A-2) the earth station inserting the service control information in the satellite DMB signal and transmitting to the DMB satellite; A-3) the DMB satellite transmitting a satellite DMB signal including the service control information to a repeater; And A-4) receiving, by the demodulator, a TDM signal of the satellite DMB signal to extract the service control information, and interpreting the extracted service control information.

And satellite DMB service control system using a pilot signal according to the present invention for achieving the above object, Satellite DMB management server for transmitting the service control information to be delivered to the repeater; An earth station which receives the service control information from the DMB management server and inserts the service control information into a satellite DMB signal and transmits the same to a DMB satellite; And a repeater which receives the satellite DMB signal from the DMB satellite and interprets the extracted service control information to interpret the extracted service control information and controls the satellite DMB service according to the service control information. It is characterized by.

Preferably, the service control information is inserted in the extended information position D51 of the frame corresponding to each of the super frames of the pilot signal.

Hereinafter, a satellite DMB service control method and system using a pilot signal according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments. Like reference numerals designate like elements throughout the drawings.

First, a satellite DMB service control system using a pilot signal according to an embodiment of the present invention will be described in detail.

3 is a system block diagram for satellite DMB service control using a pilot signal according to an embodiment of the present invention, FIG. 4 is a block diagram of a CDM frame of a satellite DMB system according to an embodiment of the present invention, and FIG. 6 is a block diagram illustrating a TDM frame of a satellite DMB system according to an embodiment of the present invention, and FIG. 6 is a block diagram showing a relationship between a main broadcast and an auxiliary broadcast according to an embodiment of the present invention. FIG. 8 is a diagram illustrating a pilot signal frame and a super frame, and FIG. 8 is a diagram illustrating a terrestrial auxiliary repeater according to an embodiment of the present invention.

As shown in FIG. 3, the satellite DMB service control system using a pilot signal according to an embodiment of the present invention applies a system that has already been established as shown in FIG.

For example, the satellite DMB management server 10 is connected to the earth station 20 and the repeater 30 in a wired or wireless manner through a network, and the repeater 40 has a service control form according to an embodiment of the present invention. It is set to receive the service control information according to, and transmits the service control information to be transmitted to the relay station 40 to the earth station (20).

The earth station 20 receives the service control information and inserts the service control information into the DMB signal to be transmitted to the DMB satellite 30.

Meanwhile, the DMB signal includes a CDM signal and a TDM signal, the CDM signal is also referred to as a main broadcast of satellite DMB, and the TDM signal is also referred to as a secondary broadcast of satellite DMB. In the case of satellite DMB using system E, the main broadcast and the sub-broadcast transmit the same data only by using a modulation method, and the relationship between the main broadcast and the sub-broadcast is shown in FIG. 6.

That is, as shown in Figs. 4 to 6, the satellite DMB broadcasting system uses elementary streams (ES; Elementary Streams) of MPEG-2 and MPEG-4 and transport streams (TS) of MPEG-2. Has a structure for transmitting to the satellite DMB transmission channel.

Therefore, the earth station 20 transmits the CDM signal modulated by the video, audio signal, and pilot information through the CDM modulator 110 to the DMB satellite 30. At this time, the pilot information is loaded with service control information. Sends a CDM signal containing control information.

Meanwhile, the CDM channel is composed of a pilot channel and a data channel. The pilot channel is a signal corresponding to channel 0 of 32 channels.

That is, as shown in FIG. 7, the pilot signal frame structure and the super frame structure have one period of the pilot signal as one frame 220 and six frames as one super frame 210. FIG.

Each frame includes a pilot symbol (PS), a unique word (D1), a frame counter (D2), pilot information (D3 to D22, D27 to D50), and a pilot error correction code (D23 to D26, D47 to D50). ) And confirmation information (hereinafter referred to as 'D51') 230.

The pilot symbol is data having a specific pattern transmitted to assist signal synchronization in the receiver, and the pilot information is information related to transmission control and the like.

In particular, the D51 230 is configured with 32 bits as an empty extended information place to perform a function not basically provided by the pilot signal, and the earth station 20 transmits the service control information to the D51 230. Insert Therefore, six types of service control information can be inserted in one super frame (6 frames) 210.

In addition, the service information is "[frame header (frame sync)] + [destination address] + [destination address] + [message type] + [data length] + [data] + [CRC] + [frame tail (frame) End)] "is set and the protocol of the frame structure such as" 32 "of D51 (230) is loaded continuously.

On the other hand, the service control information includes the relay identification information, information on the on (off) / off (Off) state of the CDM 32 channel, and information for the provision and maintenance of the communication channel, and the like (off) Off).

 In addition, the control software (S / W) download information and the like in the microcontroller unit (MCU) of the repeater are preferably further included.

In addition to this, the DMB management server 10 includes all of the information to be delivered to the repeater 40.

In this way, the earth station 20 inserts the service control information received from the satellite DMB management server 10 into the CDM signal and sends it to the DMB satellite 30, and as shown in FIG. 5, a TDM multiplexer. After inputting the CDM signal to the TDM multiplexer 130 before the modulation to 120, and outputs a quadrature phase shift keying signal (QPSK) that is a modulated TDM signal through a process such as energy dispersion, and the like It transmits to the DMB satellite 30 together with the CDM signal.

The DMB satellite 30 converts the CDM signal to 2.6 GHz and transmits the CDM signal directly to the receiving terminal 50. The DMB satellite 30 converts the TDM signal into a frequency of 11 GHz or 12 GHz and is provided in a shaded region having a weak signal. To be sent).

The repeater 40 converts the TDM signal into a CDM signal of 2.6 GHz band and transmits the TDM signal to the receiving terminal 50.

At this time, the repeater 40 demodulates the signal by inputting the TDM signal to the TDM demultiplexer 130, as shown in FIG. 8, and is inserted into the pilot signal through the demodulation process of the TDM signal. The service control information of 230 is interpreted.

That is, a pilot signal is found in the demodulated TDM signal, a start point of D51 230 of the super frame 210 of the pilot signal is found, and a frame header of service control information inserted in D51 230 is found in 32 bits. It extracts service control data loaded continuously and analyzes it.

For example, all 32 bits of the D51 230 are composed of data that controls the on / off state of the 32 channels, and in the case of extracting data in the form of hexa code such as "0xFFFF FFFF", the result is 32 You can see that the channels are all on. If you extract data such as "0xFFFF FFC", you can see that channels 0 to 29 are on and channels 30 and 31 are off. Can be.

The repeater 40 executes service control corresponding to the service control information thus interpreted.

In addition, preferably, when the repeater 40 receiving the TDM signal corresponds to the repeater identification information included in the service control information, the service according to the service control information may be controlled.

Therefore, the satellite DMB management server 120 may select the repeater 40 to which the service control information is to be transmitted, and thus the service control information may be transmitted for each individual or repeater 40 group.

Next, a satellite DMB service control method using a pilot signal according to an embodiment of the present invention will be described in detail.

9 is a flowchart illustrating a satellite DMB service control method using a pilot signal according to an embodiment of the present invention.

First, the satellite DMB management server 10 communicates with the repeater 40 to set service control information according to the type to control the satellite DMB service (S100).

In the state in which the setting is completed in the repeater 40, the satellite DMB management server 10 transmits service control information to be transmitted to the repeater 40 to the earth station 20 (S200).

Then, the earth station 20 receives the service control information, inserts it into the D51 230 of the pilot signal (S300), modulates the CDM signal and the TDM signal, and transmits it to the DMB satellite 30 (S400).

The DMB satellite 30 receiving the CDM signal and the TDM signal from the earth station 2 transmits the CDM signal directly to the receiving terminal 50 by converting the CDM signal into 2.6 GHz, and the TDM signal at a frequency of 11 GHz or 12 GHz. The signal is transmitted to the repeater 40 provided in the weak sound region (S500).

In addition, the repeater 40 converts the frequency into a CDM signal of 2.6 GHz band in order to receive the TDM signal and transmit the received TDM signal to the receiving terminal 50 (S600).

In addition, the service information is extracted in the process of demodulating the TDM signal and analyzed (S700). That is, the repeater 40 demodulates the TDM signal to find a pilot signal (S710).

In operation S720, a starting point of the D51 230 included in each of the super frames 210 of the pilot signal is found. The data inserted in the D51 (230) is read (S730).

As such, the service control information transmitted by the satellite DMB management server 10 is finally received by the repeater 40, and the repeater 40 interprets the service control information and sets the satellite in a preset form according to an analysis result. The DMB service is controlled (S800).

Meanwhile, the service control information includes repeater identification information. As a result of the service control information analysis, the repeater 40 having received the repeater identification information and the TDM signal and performing the service control information analysis process does not correspond to each other. Preferably, service control according to the service control information is not executed.

Although the present invention has been described in detail with reference to preferred embodiments, the present invention is not limited to the above-described embodiments, and the present invention belongs to the present invention without departing from the gist of the present invention as claimed in the following claims. Anyone skilled in the art will have the technical idea of the present invention to the extent that various changes or modifications can be made.

As described above, according to the satellite DMB service control method and system using the pilot signal of the present invention, the satellite DMB management server is relatively through the analysis of the signal received from the DMB satellite without transmitting the service control request information to the repeater Satellite DMB service can be controlled with low communication cost.

In addition, it is possible not only to deliver information by individual or group through interpretation of the identification information of the repeater, but also by applying information generated in a specific region or region-specific information sent from the center to a specific channel and applying to a repeater group of a specific region. have.

Claims (11)

A-1) transmitting, by the satellite DMB management server, service control information to be transmitted to the repeater to the earth station; A-2) the earth station inserting the service control information in the satellite DMB signal and transmitting to the DMB satellite; A-3) the DMB satellite transmitting a satellite DMB signal including the service control information to a repeater; And A-4) the repeater receives a TDM signal of the satellite DMB signal, demodulates it, extracts the service control information, and interprets the extracted service control information. Digital multimedia broadcasting service control method. The method of claim 1, wherein the service control information is The satellite digital multimedia broadcasting service control method using a pilot signal, characterized in that inserted into the extended information position (D51) of the frame corresponding to each of the super frame of the pilot signal. The method according to claim 2, wherein after A-4) The repeater is a satellite digital multimedia broadcasting service control method using a pilot signal, characterized in that for controlling the satellite DMB service according to the service control information. The method of claim 2, wherein the service control information is And repeater identification information, wherein the repeater executes service control according to the service control information only if the repeater is a repeater corresponding to the identification information. The method of claim 2, wherein the service control information is A method for controlling satellite digital multimedia broadcasting service using a pilot signal, comprising information on ON / OFF states of CDM 32 channels and information for providing and maintaining a communication channel. The method according to any one of claims 1 to 5, wherein step A-4) Iii) demodulating the TDM signal received from the DMB satellite to find a pilot signal; Ii) finding a starting point of an extended information position D51 included in each of the super frames of the pilot signal; And Iii) a method of controlling satellite digital multimedia broadcasting service using a pilot signal, characterized in that the data is inserted into the extended information position. A satellite DMB management server transmitting service control information to be transmitted to a repeater to an earth station; An earth station which receives the service control information from the DMB management server and inserts the service control information into a satellite DMB signal and transmits the same to a DMB satellite; And Receiving a satellite DMB signal from the DMB satellite, interpreting the extracted service control information, and interpreting the extracted service control information to perform control of the satellite DMB service according to the service control information. Satellite digital multimedia broadcasting service control system using a pilot signal characterized in that. The method of claim 7, wherein the service control information is Satellite digital multimedia broadcasting service control system using a pilot signal, characterized in that inserted into the extended information position (D51) of the frame corresponding to each of the super frame of the pilot signal. The method of claim 8, wherein the service control information is And repeater identification information, wherein the repeater executes service control according to the service control information only if the repeater is a repeater corresponding to the identification information. The method of claim 8, wherein the service control information is A satellite digital multimedia broadcasting service control system using pilot signals, comprising information on ON / OFF status of CDM 32 channels and information for providing and maintaining a communication channel. 11. The relay according to any one of claims 7 to 10, wherein the repeater Demodulates the TDM signal received from the DMB satellite, finds a pilot signal, finds the starting point of the extended information position D51 included in each of the superframes of the pilot signal, and reads the data inserted in each extended information position. Satellite digital multimedia broadcasting service control system using a pilot signal, characterized in that for interpreting the control information.

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