KR100799778B1 - Method for improving reception quality of dmb broadcasting using ip network and dmb broadcasting system having dmb ip transmission part - Google Patents

Abstract

The present invention provides a method for improving the reception quality of DMB broadcasting using an IP network, comprising: receiving a DMB data generated by the DMB transmitter and transmitting the DMB data through a terrestrial wave at a DMB receiving terminal; A buffering step of interpreting the data received in the DMB data receiving step and storing the data in a media data buffer for each channel; A loss data information transmission step of generating information on lost data which is incorrectly received or not received from the DMB data transmitted by the DMB data transmission unit and transmitting the information to the DMB IP transmission unit through an IP network; A data matching step of receiving and interpreting the lost data information transmitted to the DMB IP transmitter through an IP network to find data matching the lost data information; An additional data buffering step of transmitting the matched data in the data matching step to a DMB receiving terminal through an IP network and adding the data to the data buffer for each channel; And a reproducing step of reproducing the DMB data by adding the DMB data stored in the buffering step and the lost DMB data added in the additional data buffering step.

Description

METHOD FOR IMPROVING RECEPTION QUALITY OF DMB BROADCASTING USING IP NETWORK AND DMB BROADCASTING SYSTEM HAVING DMB IP TRANSMISSION PART}

1 is a convex configuration diagram of a DMB broadcasting system including a DMB IP transmitter according to an embodiment of the present invention;

FIG. 2 is a detailed block diagram of a DMB IP transmitter shown in FIG. 1;

3 is a flowchart illustrating a method for improving reception quality of DMB broadcasting using an IP network according to an embodiment of the present invention;

4 is a conceptual diagram illustrating an example of receiving DMB data in a method for improving reception quality of a DMB broadcast using an IP network according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10: DMB sending section 20: DMB IP sending section

30: DMB receiving terminal 31: DMB receiving unit

32: DMB stack 33: IP data exchange

34: media data buffer section 35: playback section

The present invention relates to a method for improving reception quality of digital multimedia broadcasting (DMB) broadcasting using an IP (Internet Protocol) network and a DMB broadcasting system equipped with a DMB IP transmitter. In particular, a DMB receiving terminal cannot receive or incorrectly receive The present invention relates to a method for improving reception quality of a DMB broadcast using an IP network using a method of transmitting DMB data in a DMB IP transmission system, and a DMB broadcast system including a DMB IP transmitter.

The radio broadcasts currently in use are analogue forms, originally developed for fixed reception, so that the reception of sound while walking or driving a vehicle is considerably degraded and requires high power and a wide frequency band.

In order to solve this problem, standardization and commercialization of digital audio broadcasting is underway worldwide.In Europe, which adopts Eureka-147 as a digital audio broadcasting standard, DAB (Digital Audio Broadcasting) in Europe and DAR (Digital Audio Radio) in the US In Canada, Digital Radio Broadcasting (DRB) and Digital Sound Broadcasting (DSB) are used in the International Telecommunication Union (ITU-R), and in Korea, they are used by the Ministry of Information and Communication as DMB (Digital Multimedia Broadcasting). have.

The concept of 'broadcasting broadcasting' has been expanded to 'broadcasting broadcasting' concept.In addition to music broadcasting, various multimedia information such as news, traffic information, weather information, geographical location information, video information, etc. Can transmit

Meanwhile, DMB, or digital multimedia broadcasting, named by the Ministry of Information and Communication of Korea, is digitalizing voice broadcasting, and it is 1.5Mbit / s data of high quality CD quality, text, graphics, and moving picture beyond AM and FM radio type. It is the next generation broadcasting that provides various data services that can be transmitted, bidirectionality, and excellent mobile reception quality.

However, in conventional DMB broadcasting, there is no method of retransmitting and receiving the received DMB data when the receiving terminal is not completely received by the receiving terminal due to the speed of movement of the receiving terminal or interference of radio waves. There was a problem that information was provided.

Accordingly, the present invention has been proposed to solve the above-mentioned general problems, and an object of the present invention is to use the sender and the receiver as they are in the conventional DMB broadcasting system, and by using the IP network as an auxiliary In order to improve the reception quality of DMB broadcasting, DMB broadcasting can improve the reception quality of DMB broadcasting and the DMB IP. The present invention provides a DMB broadcasting system having a transmitter.

In accordance with another aspect of the present invention, there is provided a method for improving reception quality of a DMB broadcast using an IP network, comprising: receiving a DMB data generated by a DMB transmitter and transmitting the DMB data through a terrestrial wave at a DMB receiver; A buffering step of interpreting the data received in the DMB data receiving step and storing the data in a media data buffer for each channel; A loss data information transmission step of generating information on lost data which is incorrectly received or not received from the DMB data transmitted by the DMB data transmission unit and transmitting the information to the DMB IP transmission unit through an IP network; A data matching step of receiving and interpreting the lost data information transmitted to the DMB IP transmitter through an IP network to find data matching the lost data information; An additional data buffering step of transmitting the matched data in the data matching step to a DMB receiving terminal through an IP network and adding the data to the data buffer for each channel; And a reproducing step of reproducing the DMB data by adding the DMB data stored in the buffering step and the lost DMB data added in the additional data buffering step.

In the loss data information transmission step, the loss data information may be generated using a protocol that can be recognized by the DMB IP transmitter. This is because the lost data information is generated and transmitted in a protocol that can be recognized by the DMB IP transmitter, so that the DMB IP transmitter can accurately determine what data was not received or received incorrectly.

In the transmitting of the lost data information, it is preferable to generate a protocol recognizable by the DMB IP transmitter as an IP packet having a payload, and then transmit it to the DMB IP transmitter through an IP network.

In the loss data information transmitting step, the DMB data may be configured in the form of a TS packet having a TS header including a PID (Packet Identifier) and a continuity-counter, and an error occurs in the TS packet. In this case, the loss data may be determined to generate information about the lost data.

The method for determining whether an error has occurred in the TS packet may be determined as a lost TS packet if the continuity-counter is not consecutive in the TS packets sequentially received. Detailed description thereof will be described later.

The data matching step may match data corresponding to channel information of the lost TS packet, PID of the lost packet, and continuity-counter of the lost packet.

In this case, when there is a plurality of data that matches the channel information of the lost TS packet, the PID of the lost packet, and the continuity-counter of the lost packet, the continuity-counter of the TS packet received immediately before the lost TS packet is determined. The closest TS packet may be matched using the reception time information of the TS packet received immediately before the lost TS packet.

On the other hand, the above method has a weak point that the time interval between the DMB IP transmitter and the DMB receiving terminal must be adjusted. In order to avoid the above weakness, if there is a large number of data that matches the channel information of the lost TS packet, the PID of the lost packet, and the continuity-counter of the lost packet, the continuity- of the received TS packet immediately before the lost TS packet. The nearest TS packet may be matched using a hash code of the TS packet received immediately before the counter and the lost TS packet. Detailed description thereof will be described later.

In addition, in the additional data buffering step, it is preferable to generate matched data as data in an IP packet form and then add the data to the media data buffer for each channel.

The generation of lost data information or lost DMB data in the form of a packet as described above is for convenience of transmission.

On the other hand, the DMB broadcasting system equipped with a DMB IP transmitter according to the present invention includes a DMB transmitter for generating and transmitting DMB data, a DMB receiving terminal for receiving, interpreting and reproducing DMB data, and DMB data transmitted from the DMB transmitter. In the DMB broadcasting system comprising a DMB IP transmitter for additionally transmitting DMB data not received by the DMB receiving terminal to the DMB receiving terminal, wherein the DMB receiving terminal is the DMB receiving terminal of the DMB data transmitted by the DMB transmitting unit. Generates and transmits information on lost DMB data that is not received by the DMB IP transmitter, and the DMB IP transmitter detects data matching the information on the lost DMB data generated by the receiver and transmits the data to the DMB receiver. .

The DMB receiving terminal includes: a DMB receiving unit receiving the DMB data transmitted from the DMB sending unit; A DMB stack for analyzing the DMB data received by the DMB receiving unit; A media data buffer unit configured to store DMB data for each channel as interpreted by the DMB stack, and generate information on lost DMB data not received among the DMB data transmitted by the DMB transmitter; And an IP data exchanger for transmitting the information on the lost DMB data generated by the media data buffer unit to the DMB IP transmitter or receiving and interpreting data matching the lost data information.

Hereinafter, an embodiment according to the technical concept of the present invention as described above, the DMB broadcasting system with a DMB IP transmitter is described with reference to the drawings.

1 is a convex configuration diagram of a DMB broadcasting system having a DMB IP transmitter according to an embodiment of the present invention.

As shown in the drawing, the DMB broadcasting system including the DMB IP transmitter includes a DMB transmitter 10 for generating and transmitting DMB data, a DMB receiving terminal 30 for receiving, interpreting and reproducing DMB data, and the DMB. The DMB IP transmitter 20 transmits data, which is not received by the DMB receiver terminal, out of the DMB data transmitted by the transmitter 10 to the DMB receiver terminal 30 through the IP network.

The DMB sending unit 10 generates and sends DMB data. The DMB sending unit 10 is a place for transmitting a variety of multimedia signals, such as audio, video, etc. may be mainly a communication company or a broadcasting station.

On the other hand, the DMB receiving terminal 30 refers to a portable DMB phone, PDA, vehicle DMB receiver and the like. Reference numeral 31 is a DMB receiver which receives the DMB data transmitted from the DMB transmitter 10 and transmits the same to the DMB stack 32. The DMB stack 32 then interprets the DMB data. In the present invention, data interpretation refers to a concept including analyzing and classifying DMB data received through an RF signal through digital signal processing through an A / D conversion process and classifying each channel. The DMB data analyzed by the DMB stack 32 is stored in the media data buffer unit 34 for each channel.

In the meantime, the media data buffer unit 34 determines whether there is data that needs to be retransmitted in addition to the function of storing and buffering the DMB data analyzed by the DMB stack 32 for each channel. Generates information about that data. Here, the data that needs to be retransmitted refers to data that is not received by the DMB receiver 31 or is incorrectly received from the DMB data transmitted by the DMB transmitter 10. The media data buffer unit 34 generates a protocol in a form that can be recognized by the DMB IP sending unit 20, which will be described later, for information on data that needs to be retransmitted.

In addition, the protocol of the type that can be recognized by the DMB IP transmitter 20 is transmitted to the IP data exchanger 33, and converted into a form of an IP packet. In this case, the IP packet includes a payload that contains information about data that needs to be retransmitted. The IP packet generated as described above (including information on data requiring retransmission) is transmitted to the DMB IP transmitter 20 through the IP network.

The DMB IP transmitter 20 performs a function of finding data matching the data information for retransmission. Therefore, the data corresponding to the data information that needs to be retransmitted is transmitted to the IP data exchanger 33 of the DMB receiving terminal 30 through the IP network. Then, the IP data exchanger 33 converts the data corresponding to the data information required for transmission into an IP packet form, interprets the data, and transmits the data to the media data buffer 34 for each channel. The transmitted IP packet is further stored and buffered.

Therefore, the data stored in the media data buffer unit 34 (the DMB data transmitted from the DMB sending unit and the additionally stored IP packet) is reproduced by the reproducing unit 35 as audio or video.

On the other hand, the DMB receiving terminal 30 of the present invention receives the DMB data carried in the RF signal, A / D conversion, and then undergoes a process of converting, demodulating, which is already known, so the detailed description thereof It will be omitted.

Hereinafter, the configuration of the present invention will be described with respect to the DMB IP transmitter.

FIG. 2 is a detailed block diagram of the DMB IP transmitter shown in FIG. 1.

First, the DMB IP transmitter 20 is connected to the DMB transmitter 10 through a wired network to receive DMB data. There is little concern about data loss as data is sent and received via wired network. Reference numeral 21 is a data receiver that receives DMB data transmitted through a wired network to the DMB transmitter. The received DMB data is interpreted by the DMB stack 22 and stored in the buffer unit 23.

On the other hand, the IP transmission unit 25 receives the lost data information that was not received by the DMB receiving terminal 30. The data matching section 24 then matches the data that matches the lost data information based on the DMB data stored in the buffer section 23. The matched data is transmitted from the IP transmitter 25 to the DMB receiving terminal 30 through the IP network. As such, lost data not received by the DMB receiving terminal is transmitted auxiliary through the IP network, thereby improving reception quality of DMB broadcasting.

Meanwhile, a method of improving reception quality of DMB broadcasting using an IP network according to an embodiment of the present invention using the above-described system will be described below.

3 is a flowchart illustrating a method for improving reception quality of DMB broadcasting using an IP network according to an embodiment of the present invention.

As shown, when the DMB sending unit 10 generates the DMB data and transmits the DMB data to the DMB receiving terminal 30, the DMB receiving terminal 30 receives the DMB data (S10). After the DMB data received in step S10 is analyzed, the DMB data is stored in the media buffer 34 for each channel (S20). Then, the DMB data transmitted from the DMB sending unit 10 is transmitted to the DMB receiving terminal 30 to determine whether there is no data lost (S30). If there is no lost data, the DMB data is reproduced (S70).

However, if there is lost data, the media data buffer unit 34 generates information about the lost data. This is a type of protocol that can be recognized by the DMB IP transmitter 20. The generated protocol is converted into an IP packet form having a payload and is transmitted to the DMB IP transmitter 20 through the IP network (S40). Then, the DMB IP transmitter 20 finds data that matches the information about the lost data (S50). The data found in step S50 is transmitted to the DMB receiving terminal 30 again through the IP network. The data transmitted to the DMB receiving terminal 30 is reproduced after another buffering step for each channel (S60, S70).

On the other hand, the method for checking for missing data is as follows.

The DMB data received by the DMB receiving terminal 30 has a TS header in the form of a transport stream (TS) packet. The TS header has a PID (Packet Identifier) and a continuity-counter. The continuity-counter has a continuous value for each PID unless a discontinuity is specified through the discontinuity-indicator of the adaptation-field. By using this, a lost TS packet can be detected. That is, the DMB receiving terminal 30 sequentially receives TS packets of a channel to be received, and classifies each TS packet by PID. When the discontinuity-indicator of the adaptation-field is FALSE, if the continuity-counters of TS packets having the same PID are not continuous, the corresponding TS packets are lost.

In addition, a method of transmitting information on a lost TS packet is as follows.

If the TS packet is found to be lost, it should request the DMB IP transmitter 20 to send the packet. To this end, a method for uniquely designating each TS packet is required.

4 is a conceptual diagram illustrating an example of receiving DMB data in a method for improving reception quality of a DMB broadcast using an IP network according to an embodiment of the present invention.

As shown, 3 has been received after continuity-counter 1 of PID 0x101. At this time, if the discontinuity-indicator of the TS packet corresponding to continuity-counter 3 of PID 0x101 is FALSE, it can be seen that continuity-counter 2 of PID 0x101 is lost.

After determining the TS packet loss, in order to request it to the DMB IP transmitter 20, the request for the lost TS packet must be accurate.

In order to accurately refer to the lost TS packet, the following method is proposed.

Use PID and continuity-counter.

1. Channel information of lost TS packet

2. PID of lost TS packet

3. continuity_counter of lost TS packet

The above three pieces of information are used to define the lost TS packet. The DMB IP transmitting unit 20 transmits a TS packet corresponding to the above information among the TS packets to the DMB receiving terminal 30. If there are a plurality of TS packets that match the above information, the most recently arrived TS packet is selected.

In addition to the above information (three types), information and reception time of the normally received TS packet are used. A plurality of TS packets having the same information of 1,2 and 3 may exist. This is because the continuity-counter is a 4-bit counter and cannot distinguish other than 16 of 0 ~ 15. Therefore, the information and the reception time of the normal TS packet arriving just before the loss are used to refer to the TS packet more accurately lost.

In FIG. 4, PID 0x101 and continuity-counter 1 are TS packets that have arrived normally, and PID 0x101 and continuity-counter 2 are lost TS packets that have not been received.

In order to request the lost TS packet to the DMB IP transmitter 20, the following information is transmitted.

A. Channel information of lost TS packet

B. PID of lost TS packet

C. continuity-counter of lost TS packet

D. continuity-counter of TS packets received immediately before lost TS packets

E. Receive time of TS packet received immediately before lost TS packet

The DMB IP transmitter 20 selects a plurality of TS packets using A, B, and C, and finally selects the closest TS packet using D, E. FIG.

This method selects a TS packet based on the reception time of the TS packet. In order to use this method, the time interval between the TDMB IP transmission system and the DMB receiving terminal must be precisely set.

The time interval can be adjusted using the Network Time Protocol (NTP. RFC 0958) or using a similar method.

On the other hand, in order to avoid the weakness of the time interval between the DMB IP transmitter 20 and the DMB receiving terminal 30, a hash code is used instead of the reception time of the normally received TS packet.

That is, the following information is used.

end. Channel information of lost TS packet

I. PID of lost TS packet

All. Continuity-counter of lost TS packets

la. Continuity-counter of TS packets normally received immediately before the missing TS packet

hemp. The hash code of the TS packet normally received immediately before the lost TS packet.

The DMB IP transmitter 20 selects a plurality of TS packets using a, b, and d, and finally selects the closest TS packet using a d, e.

The hash code is a code generated by using the information included in the TS packet. It should satisfy the following properties.

(One). The same code should be generated for the same TS packet.

(2). The probability of generating the same code value for different TS packets should be low enough.

As a hash code generation method that can be used here, a check sum for simply adding up the contents of a TS packet may be used.

In the present invention, the DMB IP transmitter 20 is connected to the DMB transmitter 10 via a wired network so that there is no fear of data loss in receiving DMB data. In addition, since the DMB IP transmitter 20 transmits only data not received by the DMB receiving terminal 10, the bandwidth is narrow. Therefore, the transmission rate is high.

Although the preferred embodiment of the present invention has been described above, the present invention may use various changes, modifications, and equivalents. It is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments. Accordingly, the above description does not limit the scope of the invention as defined by the limitations of the following claims.

As described above, the DMB broadcasting system equipped with the DMB broadcasting reception method and the DMB IP transmitting unit using the IP network according to the present invention auxiliaryly transmits the data part not received by the DMB receiving terminal through the IP network. In this case, the reception quality can be improved.

In addition, since only the lost data is transmitted through the IP network, the bandwidth is narrow, thereby increasing the transmission rate.

Claims (11)

A DMB data receiving step of receiving the DMB data generated and transmitted by the DMB transmitting unit through the terrestrial wave at the DMB receiving terminal; A buffering step of interpreting the data received in the DMB data receiving step and storing the data in a media data buffer for each channel; A loss data information transmission step of generating information on lost data which is incorrectly received or not received among the DMB data transmitted by the DMB sending unit, and transmitting the lost data information to the DMB IP sending unit through an IP network; A data matching step of receiving and interpreting the lost data information transmitted to the DMB IP transmitter through an IP network to find data matching the lost data information; An additional data buffering step of transmitting the matched data in the data matching step to a DMB receiving terminal through an IP network and adding the data to the data buffer for each channel; And reproducing the DMB data by adding the lost DMB data added in the buffering step and the lost DMB data added in the additional data buffering step. The method of claim 1, The method of generating loss data information in the loss data information transmitting step is a method of improving reception quality of DMB broadcasting using an IP network, wherein the loss data information is generated by a protocol recognized by the DMB IP transmitter. The method of claim 2, In the loss data information transmitting step, a DMB IP transmitter generates a protocol recognized as an IP packet having a payload, and then transmits it to the DMB IP transmitter through an IP network. How to improve reception quality of broadcast. The method of claim 1, The additional data buffering step may include generating matched data as data in an IP packet form and adding the data to the media data buffer for each channel. The method of claim 1, In the transmitting of the lost data information, the DMB data is in the form of a TS packet having a TS header including a PID (Packet Identifier, Packet Identifier) and a continuity-counter. A method for improving reception quality of DMB broadcasting using an IP network. The method of claim 5, wherein In the method for determining whether an error occurs in the TS packet, if the continuity-counter is not continuously received in the TS packets sequentially received, the received quality improvement of the DMB broadcast using the IP network, characterized in that it is determined as a lost TS packet. Way. The method of claim 6, And receiving data matching channel information of the lost TS packet, PID of the lost packet, and continuity-counter of the lost packet in the data matching step. The method of claim 7, wherein In the data matching step, if there is a plurality of data that matches the channel information of the lost TS packet, the PID of the lost packet, and the continuity-counter of the lost packet, the continuity- of the received TS packet immediately before the lost TS packet. A method for improving reception quality of a DMB broadcast using an IP network, wherein the closest TS packet is matched using a counter and reception time information of a TS packet received immediately before the lost TS packet. The method of claim 7, wherein In the data matching step, if there is a plurality of data that matches the channel information of the lost TS packet, the PID of the lost packet, and the continuity-counter of the lost packet, the continuity- of the received TS packet immediately before the lost TS packet. A method for improving reception quality of a DMB broadcast using an IP network, wherein the nearest TS packet is matched by using a hash code of a TS packet received immediately before a counter and a lost TS packet. DMB sending unit that generates and sends DMB data, DMB receiving terminal that receives, interprets and reproduces DMB data, and DMB data that is not received by DMB receiving terminal among DMB data sent by DMB sending unit is additionally sent to DMB receiving terminal In the DMB broadcasting system comprising a DMB IP transmitting unit, The DMB receiving terminal generates information on the lost DMB data not received by the DMB receiving terminal among the DMB data transmitted by the DMB transmitting unit, and transmits the information to the DMB IP transmitting unit. The DMB IP transmitting unit is provided with a DMB IP transmitting unit, characterized in that for finding the data matching the information on the lost DMB data generated by the receiving terminal and transmitting to the DMB receiving terminal. The method of claim 10, The DMB receiving terminal includes a DMB receiving unit for receiving the DMB data transmitted from the DMB sending unit; A DMB stack for analyzing the DMB data received by the DMB receiving unit; A media data buffer unit configured to store DMB data for each channel as interpreted by the DMB stack, and generate information on lost DMB data not received among the DMB data transmitted by the DMB transmitter; DMB provided with a DMB IP transmitter, characterized in that the IP data exchange unit for transmitting the information on the lost DMB data generated by the media data buffer unit to the DMB IP transmitter or receive and interpret the data matching the lost data information Broadcasting system.

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