EP1946547A1 - Data service managing apparatus and method for frequency band extension and dmb data server using the same and dmb receiving system for broadband data service - Google Patents

Data service managing apparatus and method for frequency band extension and dmb data server using the same and dmb receiving system for broadband data service

Info

Publication number
EP1946547A1
EP1946547A1 EP06769135A EP06769135A EP1946547A1 EP 1946547 A1 EP1946547 A1 EP 1946547A1 EP 06769135 A EP06769135 A EP 06769135A EP 06769135 A EP06769135 A EP 06769135A EP 1946547 A1 EP1946547 A1 EP 1946547A1
Authority
EP
European Patent Office
Prior art keywords
data
service
band
basic
dmb
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP06769135A
Other languages
German (de)
French (fr)
Other versions
EP1946547A4 (en
Inventor
Sam-Mo Cho
Young-Kwon Hahm
Chung-Hyun Ahn
Soo-In Lee
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Electronics and Telecommunications Research Institute ETRI
Original Assignee
Electronics and Telecommunications Research Institute ETRI
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Electronics and Telecommunications Research Institute ETRI filed Critical Electronics and Telecommunications Research Institute ETRI
Publication of EP1946547A1 publication Critical patent/EP1946547A1/en
Publication of EP1946547A4 publication Critical patent/EP1946547A4/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/442—Monitoring of processes or resources, e.g. detecting the failure of a recording device, monitoring the downstream bandwidth, the number of times a movie has been viewed, the storage space available from the internal hard disk
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/42—Arrangements for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/28—Arrangements for simultaneous broadcast of plural pieces of information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2385—Channel allocation; Bandwidth allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/86—Arrangements characterised by the broadcast information itself
    • H04H20/93—Arrangements characterised by the broadcast information itself which locates resources of other pieces of information, e.g. URL [Uniform Resource Locator]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H2201/00—Aspects of broadcast communication
    • H04H2201/10—Aspects of broadcast communication characterised by the type of broadcast system
    • H04H2201/11—Aspects of broadcast communication characterised by the type of broadcast system digital multimedia broadcasting [DMB]

Definitions

  • the present invention relates to a data service managing apparatus and method for frequency band extension, a Digital Multimedia Broadcasting (DMB) data server using the same, and a DMB receiving system for a broadband data service. More particularly, the invention is directed to a data service managing apparatus and method for a frequency band extension, a DMB data server using the same and a DMB receiving system for a broadband data service, which enable a high efficiency and large capacity multimedia data service by providing an additional band while keeping compatibility with the existing DMB transmitting and receiving systems that cannot support a large capacity data service due to a limited frequency band.
  • DMB Digital Multimedia Broadcasting
  • a terrestrial DMB system is designed to transmit/receive moving image relatively strong against errors by using the transmission infrastructure of Digital Audio Broadcasting (DAB) system.
  • DAB Digital Audio Broadcasting
  • the system is known suitable for services that mainly target vehicles and wireles receivers such as mobile phones since it enables a stable reception of moving image and data even during movement.
  • the terrestrial DMB system is designed for audio-centered service at the beginning, its bandwidth is limited to 1.5 Mbps to have a low payload transmission capability of about 1 Mbps.
  • the conventional system cannot provide a large capacity data service such as video transmission of Standard Definition (SD) level and its modulation scheme is also inefficient owing to use of standard developed at the beginning of the 1990s, compared to the current modulation scheme.
  • SD Standard Definition
  • a data service managing apparatus for a frequency band extension for accommodating a broadband Digital Multimedia Broadcasting (DMB) data service by using a basic DMB transmission system having a predetermined basic frequency band and an additional DMB transmission system having an additional frequency band other than the basic frequency band, including: a band confirmation unit for confirming a frequency band used for each data service; and a data distributor for distributing service data to a system capable of processing the service data among the basic DMB transmission system and the additional DMB transmission system based on the frequency band confirmed by the band confirmation unit.
  • DMB Digital Multimedia Broadcasting
  • DMB data server for a frequency band extension, including: a data service managing unit for confirming a frequency band used for each data service, and bypassing service data to be processed in a basic band to a basic DMB transmission system and transmitting service data to be processed in an additional band to a data processing processor; and the data processor for processing the data provided from the data service managing unit based on a DMB standard to generate a DMB broadcasting signal.
  • DMB receiving system for a broadband data service, including: a Radio Frequency (RF) processor for receiving and converting an RF broadcasting signal into an Intermediate Frequency (IF) signal; a baseband processor for converting the IF signal obtained in the RF processor into a baseband signal; a data decoder for decoding the baseband signal outputted from the baseband processor, and combining data that is divided and serviced in accordance with a frequency band at a transmitting end; and an application service decoder for providing an application service by using the data outputted from the data decoder.
  • RF Radio Frequency
  • IF Intermediate Frequency
  • a data service managing method for a frequency band extension for accommodating a broadband DMB data service by using a basic DMB transmission system having a predetermined basic frequency band and an additional DMB transmission system having an additional frequency band other than the basic frequency band, including the steps of: a) confirming a frequency band used for each data service; b) if the data service is a service using the basic band, distributing service data to the basic DMB transmission system; c) if the data service is a service using the additional band, distributing service data to the additional DMB transmission system; and d) if the data service is a service using both basic and additional bands, distributing the service data to a system capable of processing the service data among the basic DMB transmission system and the additional DMB transmission system based upon a transmission rate of the service data.
  • the present invention as described above and below has an advantage in that it extends a transmission bandwidth of a terrestrial DMB system and also applies a high efficient modulation scheme under the bandwidth so extended while keeping compatibility with the existing terrestrial DAB/DMB systems, thereby accommodating a high efficient and large capacity data service required in the future.
  • the invention can accommodate a future large-capacity multimedia data service by extending a transmission bandwidth to 3 MHz or 6 MHz that is TV channel bandwidth and then sending data therethrough, while supporting a DMB system and its receiver using an existing 1.5 MHz bandwidth.
  • FIG. 1 is a diagram describing the concept of a frequency band extension method in a terrestrial DMB in accordance with the present invention
  • FIGs. 2 and 3 are diagrams describing patterns using a basic band and an additional band in case of extending a frequency band in accordance with the present invention
  • FIG. 4 is a block diagram illustrating a configuration of a terrestrial DMB transmission system for a frequency band extension in accordance with an embodiment of the invention
  • FIG. 5 is a detailed block diagram showing a configuration of the data service managing unit for the frequency band extension in accordance with an embodiment of the invention
  • Fig. 6 is a block diagram illustrating a configuration of a terrestrial DMB transmission system for a frequency band extension in accordance with another embodiment of the invention
  • Fig. 7 is a block diagram illustrating a configuration of a DMB data server for a frequency band extension in accordance with an embodiment of the invention
  • Fig. 8 is a block diagram illustrating a configuration of a terrestrial DMB receiving system for a broadband data service in accordance with an embodiment of the invention
  • Fig. 9 is a block diagram illustrating a configuration of a terrestrial DMB receiving system for a broadband data service in accordance with another embodiment of the invention.
  • Fig. 1 is a diagram describing the concept of a frequency band extension method in a terrestrial DMB in accordance with the present invention.
  • Fig. 1 As shown in Fig. 1, a frequency band or basic band of the terrestrial DMB to which
  • Figs. 2 and 3 are diagrams showing patterns that use the basic band and the additional band where the frequency band is extended in accordance with the invention.
  • the terrestrial DMB receiving system will be simply called terminal in the following description referring to Figs. 2 and 3.
  • Fig. 2 shows a pattern that makes use of only any one of the basic band and the additional band for each service or terminal
  • Fig. 3 presents a pattern that the same service or terminal utilizes both of the basic band and the additional band.
  • a service A using only the basic band is receivable by any of an existing terminal A that supports the basic band merely and a new terminal B that supports all of the basic band and the additional band, whereas a service B using a new band or the additional band is receivable by the new terminal B.
  • FIG. 3 an explanation is made for how a new terminal processes a service C received over all of the basic band and the new additional band.
  • multiplexing followed by transmission is performed to employ the basic band and the additional band together based on required capacity of data service or efficiency of service. For example, if a service cannot be processed with the entire capacity of the basic band or residual capacity in the basic band, it is checked whether the new additional band can accommodate the remaining service capacity, and if yes, data is divided and serviced to be used in the two bands.
  • Fig. 4 is a block diagram illustrating a configuration of a terrestrial DMB transmission system for a frequency band extension in accordance with an embodiment of the invention. As illustrated, the system includes a data service managing unit 41, a basic DMB transmission system 42, and an additional DMB transmission system 43.
  • the basic DMB transmission system 42 includes a basic data server 421 and a basic transmission system 422 to process and transmit data based on the DMB standard within a basic band, e.g., 1.5 MHz.
  • the additional DMB transmission system 43 includes an additional data server 431 and an additional transmission system 432 to process and transmit data under the DMB standard within an additional band.
  • the additional band used herein is means an upper or lower band adjacent to the basic band. When the additional band has a bandwidth of 1.464 MHz when the entire bandwidth is 3 MHz. When the entire bandwidth is 6MHz, the additional band has a bandwidth of 4.464 MHz. In order to reduce interference between the basic band and the additional band, there may be a guard band of a proper size therebetween.
  • the data service managing unit 41 is positioned in the front end of the basic data server 421 and the additional data server 431 and determines whether to transmit a data service will to the basic data server 421 or to the additional data server 431. In case of specific large capacity service, data is divided and then sent to both systems.
  • the additional transmission system 432 may increase or decrease only the number of subcarriers depending on the size of band while using the same Differential Quadrature Phase Shift Keying-Coded Orthogonal Frequency Division Multiplexing (DQPSK-COFDM) as adopted by the basic transmission system 422. Otherwise, the additional transmission system 432 may employ another modulation scheme with a higher efficiency than that of the DQPSK while using the same COFDM as adopted by the basic transmission system 422. Alternatively, the additional transmission system 432 may employ other high-efficient modulation schemes or Code Division Multiplexing (CDM), instead of the DQPSK and COFDM adopted by the basic transmission system 422. Details will be given below with reference to Fig. 5.
  • CDM Code Division Multiplexing
  • FIG. 5 is a detailed block diagram showing a configuration of the data service managing unit for the frequency band extension in accordance with an embodiment of the invention in which a data service managing method conducted in the data service managing unit will be also described together.
  • the data service managing unit 41 serves to accommodate broadband data service and it comprises a band confirmation unit 51 and a data distributor 52, which is shown in Fig. 5.
  • the band confirmation unit 51 confirms a frequency band used for each data service.
  • the band confirmation unit 51 functions to confirm whether a data service uses the basic band, the additional band, or both of them according to the data transmission rate of the data service.
  • the data distributor 52 distributes the data associated with the data service to a corresponding system between the basic DMB transmission system 42 and the additional DMB transmission system 43 based on the confirmation result obtained by the band confirmation unit 51.
  • the data distributor 52 delivers the service data or data to be sent via the
  • DMB transmission system to the basic DMB transmission system 42 for the data service using the basic band, and to the additional DMB transmission system 43 for the data service using the additional band.
  • the data distributor 52 distributes the service data to the DMB transmission system of frequency band that can process the service data at the given transmission rate between the basic DMB transmission system 42 and the additional DMB transmission system 43 for the data service using both of the basic band and the additional band.
  • the data distributor 52 adds identification information and sequence information to data distributed to the corresponding DMB transmission system for the data service using all of the bands and distributes the data to a corresponding DMB transmission system.
  • the identification information indicates the data are for a service using both basic and additional bands, and the sequence information is used when the transmitted data are combined at the receiving part.
  • the basic data server 421 and the additional data server 431 insert the identification information and sequence information into Fast Information Channel (FIC) upon generation of a DMB broadcasting signal according to the DMB standard.
  • FIC Fast Information Channel
  • FIG. 6 is a block diagram illustrating a configuration of a terrestrial DMB transmission system for a frequency band extension in accordance with another embodiment of the invention.
  • Fig. 6 shows that an additional data server 61, i.e., DMB data server, is in charge of service managing function, without having the separate data service managing unit.
  • the additional data server 61 bypasses data to be sent via the existing systems to the basic data server 621, and processes data to be sent via an additional transmission system 63 according to the DMB standard and then sends the same to the system 63.
  • the additional data server 61 also divides the data and then sends divided data via the two systems.
  • FIG. 7 is a block diagram illustrating a configuration of a DMB data server for a frequency band extension in accordance with an embodiment of the invention.
  • a DMB data server or additional data server 61 shown in Figs. 6 and 7 comprises a data service managing unit 71 for performing a service managing function by the data service managing unit 41 and a data processor 72 for doing the same function as the additional data server 431.
  • the data service managing unit 71 which serves to accommodate a broadband data service, is constituted by a band confirmation unit 711 and a data distributor 712, as shown in Fig. 7.
  • the data confirmation unit 711 functions to confirm a frequency band used for each data service, which conducts the same function as the band confirmation unit 51 depicted in Fig. 5.
  • the data distributor 712 delivers data related to a data service to the basic DMB transmission system 42 or to the data processor 72 for processing in the unit 712 itself, based on the confirmation result done by the band confirmation unit 711.
  • the data distributor 712 bypasses service data to the basic DMB transmission system 42 for service using the basic band; and delivers service data to the data processing unit 72 for processing in the distributor 712 itself for service using the additional band.
  • the data distributor 712 distributes service data to the data processor 72 or the basic DMB transmission system 42 depending on its frequency band for service using both basic band and additional band.
  • Fig. 8 is a block diagram illustrating a configuration of a terrestrial DMB receiving system for a broadband data service in accordance with an embodiment of the invention.
  • a receiving system also needs a special decoding scheme for the above purpose. If the receiving system judges that a specific service uses both of the basic band and the additional band by a detection of a terrestrial DMB signal, it needs to decode the signal data in each of both bands, couple the divided two data and then conduct application service decoding about the coupled data.
  • IF Intermediate Frequency
  • the additional RF processor 83 and the additional baseband processor 84 at the receiving end should be also configured to be compatible with the schemes adopted at the transmitting end.
  • the data decoder 85 decodes the baseband signals wherein they are decoded for each band for the service using the basic band and the additional band and then coupled. At this time, the data decoder 85 extracts the identification information denoting data for the service using all of the basic band and the additional band and the sequence information for data coupling at the receiving end, which are involved in the FIC upon decoding, to use them to combine data.
  • An application service decoder 86 provides application services such as geographic information service and so on by using the data from the data decoder 85.
  • FIG. 9 is a block diagram illustrating a configuration of a terrestrial DMB receiving system for a broadband data service in accordance with another embodiment of the invention.
  • the receiving system as shown in Fig. 9 receives a terrestrial DMB RF signal by employing a broadband RF processor 91 of 3 MHz or 6 MHz capable of receiving data of the two bands without using two RF processors.
  • the received terrestrial DMB RF signal is converted into a baseband signal by a single baseband processor 92 and then decoded by a data decoder 93 and an application service decoder 94 for its service.
  • the application service decoder 94 provides an application service by using the data outputted from the data decoder 93.
  • the invention when a system of wider bandwidth is required to accommodate future large- volume multimedia data, compared to the terrestrial DMB system being serviced at present, the invention as explained referring to Figs. 4 to 9 provides a system that can be compatibly used with the existing DMB systems using 1.5 MHz band before the bandwidth is changed into a terrestrial DMB system of 3 MHz or 6 MHz. As a result, the invention can accommodate the large capacity multimedia data readily and inexpensively, without changing to any new system, by applying Software Defined Radio (SDR) technology, etc. thereto.
  • SDR Software Defined Radio
  • the method of the present invention as mentioned above may be implemented by a software program and stored in a computer-readable storage medium such as CD- ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, and the like. Since this process may be readily carried out by those skilled in the art, details will not be provided herein.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Business, Economics & Management (AREA)
  • General Business, Economics & Management (AREA)
  • Databases & Information Systems (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

Provided are a data service managing apparatus and method for a frequency band extension, a Digital Multimedia Broadcasting (DMB) data server using the same, and a DMB receiving system for a broadband data service. The data service managing apparatus for the frequency band extension accommodates a broadband DMB data service by using a basic DMB transmission system having a predetermined basic frequency band and an additional DMB transmission system having an additional frequency band other than the basic frequency band. The apparatus includes: a band confirmation unit for confirming a frequency band used for each data service; and a data distributor for distributing service data to a system capable of processing the service data among the basic DMB transmission system and the additional DMB transmission system based on the frequency band confirmed by the band confirmation unit.

Description

Description DATA SERVICE MANAGING APPARATUS AND METHOD
FOR FREQUENCY BAND EXTENSION AND DMB DATA
SERVER USING THE SAME AND DMB RECEIVING SYSTEM
FOR BROADBAND DATA SERVICE
Technical Field
[1] The present invention relates to a data service managing apparatus and method for frequency band extension, a Digital Multimedia Broadcasting (DMB) data server using the same, and a DMB receiving system for a broadband data service. More particularly, the invention is directed to a data service managing apparatus and method for a frequency band extension, a DMB data server using the same and a DMB receiving system for a broadband data service, which enable a high efficiency and large capacity multimedia data service by providing an additional band while keeping compatibility with the existing DMB transmitting and receiving systems that cannot support a large capacity data service due to a limited frequency band.
[2]
Background Art
[3] A terrestrial DMB system is designed to transmit/receive moving image relatively strong against errors by using the transmission infrastructure of Digital Audio Broadcasting (DAB) system. Thus, the system is known suitable for services that mainly target vehicles and wireles receivers such as mobile phones since it enables a stable reception of moving image and data even during movement.
[4] However, since the terrestrial DMB system is designed for audio-centered service at the beginning, its bandwidth is limited to 1.5 Mbps to have a low payload transmission capability of about 1 Mbps. Thus, the conventional system cannot provide a large capacity data service such as video transmission of Standard Definition (SD) level and its modulation scheme is also inefficient owing to use of standard developed at the beginning of the 1990s, compared to the current modulation scheme.
[5]
Disclosure of Invention Technical Problem
[6] It is, therefore, an object of the present invention to provide a data service managing apparatus and method for frequency band extension, a DMB data server using the same and a DMB receiving system for a broadband data service, which enable a high- efficiency and large-capacity multimedia data service by providing an additional band while maintaining compatibility with the existing DMB transmitting and receiving systems that cannot support a large capacity data service due to a limited frequency band.
[7]
Technical Solution
[8] In accordance with one aspect of the present invention, there is provided a data service managing apparatus for a frequency band extension for accommodating a broadband Digital Multimedia Broadcasting (DMB) data service by using a basic DMB transmission system having a predetermined basic frequency band and an additional DMB transmission system having an additional frequency band other than the basic frequency band, including: a band confirmation unit for confirming a frequency band used for each data service; and a data distributor for distributing service data to a system capable of processing the service data among the basic DMB transmission system and the additional DMB transmission system based on the frequency band confirmed by the band confirmation unit.
[9] In accordance with another aspect of the present invention, there is provided a
DMB data server for a frequency band extension, including: a data service managing unit for confirming a frequency band used for each data service, and bypassing service data to be processed in a basic band to a basic DMB transmission system and transmitting service data to be processed in an additional band to a data processing processor; and the data processor for processing the data provided from the data service managing unit based on a DMB standard to generate a DMB broadcasting signal.
[10] In accordance with yet another aspect of the present invention, there is provided a
DMB receiving system for a broadband data service, including: a Radio Frequency (RF) processor for receiving and converting an RF broadcasting signal into an Intermediate Frequency (IF) signal; a baseband processor for converting the IF signal obtained in the RF processor into a baseband signal; a data decoder for decoding the baseband signal outputted from the baseband processor, and combining data that is divided and serviced in accordance with a frequency band at a transmitting end; and an application service decoder for providing an application service by using the data outputted from the data decoder.
[11] In accordance with still another aspect of the present invention, there is provided a data service managing method for a frequency band extension for accommodating a broadband DMB data service by using a basic DMB transmission system having a predetermined basic frequency band and an additional DMB transmission system having an additional frequency band other than the basic frequency band, including the steps of: a) confirming a frequency band used for each data service; b) if the data service is a service using the basic band, distributing service data to the basic DMB transmission system; c) if the data service is a service using the additional band, distributing service data to the additional DMB transmission system; and d) if the data service is a service using both basic and additional bands, distributing the service data to a system capable of processing the service data among the basic DMB transmission system and the additional DMB transmission system based upon a transmission rate of the service data.
[12] The other objectives and advantages of the invention will be understood by the following description and will also be appreciated by the embodiments of the invention more clearly. Further, the objectives and advantages of the invention will readily be seen that they can be realized by the means and its combination specified in the claims.
[13]
Advantageous Effects
[14] The present invention as described above and below has an advantage in that it extends a transmission bandwidth of a terrestrial DMB system and also applies a high efficient modulation scheme under the bandwidth so extended while keeping compatibility with the existing terrestrial DAB/DMB systems, thereby accommodating a high efficient and large capacity data service required in the future.
[15] In other words, the invention can accommodate a future large-capacity multimedia data service by extending a transmission bandwidth to 3 MHz or 6 MHz that is TV channel bandwidth and then sending data therethrough, while supporting a DMB system and its receiver using an existing 1.5 MHz bandwidth.
[16]
Brief Description of the Drawings
[17] The above and other objects and features of the present invention will become apparent from the following description of the preferred embodiments given in conjunction with the accompanying drawings, in which:
[18] Fig. 1 is a diagram describing the concept of a frequency band extension method in a terrestrial DMB in accordance with the present invention;
[19] Figs. 2 and 3 are diagrams describing patterns using a basic band and an additional band in case of extending a frequency band in accordance with the present invention;
[20] Fig. 4 is a block diagram illustrating a configuration of a terrestrial DMB transmission system for a frequency band extension in accordance with an embodiment of the invention;
[21] Fig. 5 is a detailed block diagram showing a configuration of the data service managing unit for the frequency band extension in accordance with an embodiment of the invention; [22] Fig. 6 is a block diagram illustrating a configuration of a terrestrial DMB transmission system for a frequency band extension in accordance with another embodiment of the invention; [23] Fig. 7 is a block diagram illustrating a configuration of a DMB data server for a frequency band extension in accordance with an embodiment of the invention; [24] Fig. 8 is a block diagram illustrating a configuration of a terrestrial DMB receiving system for a broadband data service in accordance with an embodiment of the invention; and [25] Fig. 9 is a block diagram illustrating a configuration of a terrestrial DMB receiving system for a broadband data service in accordance with another embodiment of the invention. [26]
Best Mode for Carrying Out the Invention [27] The above-mentioned objectives, features, and advantages will be more apparent by the following detailed description with reference to the accompanying drawings; and thus, the invention will be readily conceived by those skilled in the art to which the invention pertains. Further, in the following description, well-known arts will not be described in detail if it seems that they could obscure the invention in unnecessary detail. Hereinafter, preferred embodiments of the present invention will be set forth in detail with reference to the accompanying drawings. [28] Fig. 1 is a diagram describing the concept of a frequency band extension method in a terrestrial DMB in accordance with the present invention. [29] As shown in Fig. 1, a frequency band or basic band of the terrestrial DMB to which
1.5 MHz is assigned at present is followed by an additional band. Thus, the whole bandwidth indicating the sum of the basic band and the additional band can be extended to 3 MHz, or 6 MHz that is a TV bandwidth. [30] Figs. 2 and 3 are diagrams showing patterns that use the basic band and the additional band where the frequency band is extended in accordance with the invention. Hereinafter, the terrestrial DMB receiving system will be simply called terminal in the following description referring to Figs. 2 and 3. [31] Fig. 2 shows a pattern that makes use of only any one of the basic band and the additional band for each service or terminal, and Fig. 3 presents a pattern that the same service or terminal utilizes both of the basic band and the additional band. [32] In Fig. 2, a service A using only the basic band is receivable by any of an existing terminal A that supports the basic band merely and a new terminal B that supports all of the basic band and the additional band, whereas a service B using a new band or the additional band is receivable by the new terminal B.
[33] Meanwhile, in Fig. 3, an explanation is made for how a new terminal processes a service C received over all of the basic band and the new additional band. At this time, at a transmitting end, multiplexing followed by transmission is performed to employ the basic band and the additional band together based on required capacity of data service or efficiency of service. For example, if a service cannot be processed with the entire capacity of the basic band or residual capacity in the basic band, it is checked whether the new additional band can accommodate the remaining service capacity, and if yes, data is divided and serviced to be used in the two bands.
[34] Fig. 4 is a block diagram illustrating a configuration of a terrestrial DMB transmission system for a frequency band extension in accordance with an embodiment of the invention. As illustrated, the system includes a data service managing unit 41, a basic DMB transmission system 42, and an additional DMB transmission system 43.
[35] The basic DMB transmission system 42 includes a basic data server 421 and a basic transmission system 422 to process and transmit data based on the DMB standard within a basic band, e.g., 1.5 MHz. The additional DMB transmission system 43 includes an additional data server 431 and an additional transmission system 432 to process and transmit data under the DMB standard within an additional band. The additional band used herein is means an upper or lower band adjacent to the basic band. When the additional band has a bandwidth of 1.464 MHz when the entire bandwidth is 3 MHz. When the entire bandwidth is 6MHz, the additional band has a bandwidth of 4.464 MHz. In order to reduce interference between the basic band and the additional band, there may be a guard band of a proper size therebetween.
[36] The data service managing unit 41 is positioned in the front end of the basic data server 421 and the additional data server 431 and determines whether to transmit a data service will to the basic data server 421 or to the additional data server 431. In case of specific large capacity service, data is divided and then sent to both systems.
[37] Meanwhile, the additional transmission system 432 may increase or decrease only the number of subcarriers depending on the size of band while using the same Differential Quadrature Phase Shift Keying-Coded Orthogonal Frequency Division Multiplexing (DQPSK-COFDM) as adopted by the basic transmission system 422. Otherwise, the additional transmission system 432 may employ another modulation scheme with a higher efficiency than that of the DQPSK while using the same COFDM as adopted by the basic transmission system 422. Alternatively, the additional transmission system 432 may employ other high-efficient modulation schemes or Code Division Multiplexing (CDM), instead of the DQPSK and COFDM adopted by the basic transmission system 422. Details will be given below with reference to Fig. 5.
[38] Fig. 5 is a detailed block diagram showing a configuration of the data service managing unit for the frequency band extension in accordance with an embodiment of the invention in which a data service managing method conducted in the data service managing unit will be also described together.
[39] Specifically, the data service managing unit 41 serves to accommodate broadband data service and it comprises a band confirmation unit 51 and a data distributor 52, which is shown in Fig. 5.
[40] The band confirmation unit 51 confirms a frequency band used for each data service. In other words, the band confirmation unit 51 functions to confirm whether a data service uses the basic band, the additional band, or both of them according to the data transmission rate of the data service.
[41] Meanwhile, the data distributor 52 distributes the data associated with the data service to a corresponding system between the basic DMB transmission system 42 and the additional DMB transmission system 43 based on the confirmation result obtained by the band confirmation unit 51.
[42] Namely, the data distributor 52 delivers the service data or data to be sent via the
DMB transmission system to the basic DMB transmission system 42 for the data service using the basic band, and to the additional DMB transmission system 43 for the data service using the additional band.
[43] In addition, the data distributor 52 distributes the service data to the DMB transmission system of frequency band that can process the service data at the given transmission rate between the basic DMB transmission system 42 and the additional DMB transmission system 43 for the data service using both of the basic band and the additional band.
[44] Furthermore, the data distributor 52 adds identification information and sequence information to data distributed to the corresponding DMB transmission system for the data service using all of the bands and distributes the data to a corresponding DMB transmission system. The identification information indicates the data are for a service using both basic and additional bands, and the sequence information is used when the transmitted data are combined at the receiving part. Then, the basic data server 421 and the additional data server 431 insert the identification information and sequence information into Fast Information Channel (FIC) upon generation of a DMB broadcasting signal according to the DMB standard.
[45] Fig. 6 is a block diagram illustrating a configuration of a terrestrial DMB transmission system for a frequency band extension in accordance with another embodiment of the invention.
[46] Differently from Fig. 4, Fig. 6 shows that an additional data server 61, i.e., DMB data server, is in charge of service managing function, without having the separate data service managing unit. [47] The additional data server 61 bypasses data to be sent via the existing systems to the basic data server 621, and processes data to be sent via an additional transmission system 63 according to the DMB standard and then sends the same to the system 63. At this time, in case of large-capacity data service or specific services to be sent through all use of the basic system and additional system, the additional data server 61 also divides the data and then sends divided data via the two systems.
[48] The setting method of the basic band and the additional band and the additional transmission system 63 were roughly described above. Details thereof will be provided with reference to Fig. 7 hereinafter.
[49] Fig. 7 is a block diagram illustrating a configuration of a DMB data server for a frequency band extension in accordance with an embodiment of the invention.
[50] A DMB data server or additional data server 61 shown in Figs. 6 and 7 comprises a data service managing unit 71 for performing a service managing function by the data service managing unit 41 and a data processor 72 for doing the same function as the additional data server 431.
[51] The data service managing unit 71, which serves to accommodate a broadband data service, is constituted by a band confirmation unit 711 and a data distributor 712, as shown in Fig. 7.
[52] Specifically, the data confirmation unit 711 functions to confirm a frequency band used for each data service, which conducts the same function as the band confirmation unit 51 depicted in Fig. 5.
[53] Meanwhile, the data distributor 712 delivers data related to a data service to the basic DMB transmission system 42 or to the data processor 72 for processing in the unit 712 itself, based on the confirmation result done by the band confirmation unit 711.
[54] More specifically, the data distributor 712 bypasses service data to the basic DMB transmission system 42 for service using the basic band; and delivers service data to the data processing unit 72 for processing in the distributor 712 itself for service using the additional band.
[55] In addition, the data distributor 712 distributes service data to the data processor 72 or the basic DMB transmission system 42 depending on its frequency band for service using both basic band and additional band.
[56] Further, the data distributor 712 adds to the service data to be distributed identification information indicating that the service data is service data using all of the two bands and sequence information for data coupling at a receiving end, for data service using all of the bands. Then, the basic data server 621 and the data processor 72 insert the identification information and sequence information into FIC when creating a DMB broadcasting signal according to the DMB standard. [57] Fig. 8 is a block diagram illustrating a configuration of a terrestrial DMB receiving system for a broadband data service in accordance with an embodiment of the invention.
[58] To receive the signal sent from the transmitting system of the invention as shown in
Figs. 4 and 7, a receiving system also needs a special decoding scheme for the above purpose. If the receiving system judges that a specific service uses both of the basic band and the additional band by a detection of a terrestrial DMB signal, it needs to decode the signal data in each of both bands, couple the divided two data and then conduct application service decoding about the coupled data.
[59] If a basic RF processor 81 and an additional RF processor 83 receive the terrestrial
DMB RF signals within each frequency band range and convert them into Intermediate Frequency (IF) signals, respectively, a basic baseband processor 82 and an additional baseband processor 84 convert the IF signals from the RF processors 81 and 83 into baseband signals.
[60] In case where the additional transmission systems 432 and 63 at the transmitting end make use of any schemes other than the DQPSK and COFDM schemes adopted by the basic transmission systems 422 and 622, the additional RF processor 83 and the additional baseband processor 84 at the receiving end should be also configured to be compatible with the schemes adopted at the transmitting end.
[61] Then, the data decoder 85 decodes the baseband signals wherein they are decoded for each band for the service using the basic band and the additional band and then coupled. At this time, the data decoder 85 extracts the identification information denoting data for the service using all of the basic band and the additional band and the sequence information for data coupling at the receiving end, which are involved in the FIC upon decoding, to use them to combine data.
[62] An application service decoder 86 provides application services such as geographic information service and so on by using the data from the data decoder 85.
[63] Fig. 9 is a block diagram illustrating a configuration of a terrestrial DMB receiving system for a broadband data service in accordance with another embodiment of the invention.
[64] The receiving system as shown in Fig. 9 receives a terrestrial DMB RF signal by employing a broadband RF processor 91 of 3 MHz or 6 MHz capable of receiving data of the two bands without using two RF processors. The received terrestrial DMB RF signal is converted into a baseband signal by a single baseband processor 92 and then decoded by a data decoder 93 and an application service decoder 94 for its service.
[65] If data is divided into two bands and then sent at the transmitting end since a service uses all of the basic band and the additional band, the divided data are processed within respective band ranges via the broadband RF processor unit 91 and the baseband processor 92 wherein they are converted into baseband signals and decoded by the data decoder 93 to reconstruct original data. The step of coupling or reconstructing such data was described in Fig. 8 above.
[66] The application service decoder 94 provides an application service by using the data outputted from the data decoder 93.
[67] When a system of wider bandwidth is required to accommodate future large- volume multimedia data, compared to the terrestrial DMB system being serviced at present, the invention as explained referring to Figs. 4 to 9 provides a system that can be compatibly used with the existing DMB systems using 1.5 MHz band before the bandwidth is changed into a terrestrial DMB system of 3 MHz or 6 MHz. As a result, the invention can accommodate the large capacity multimedia data readily and inexpensively, without changing to any new system, by applying Software Defined Radio (SDR) technology, etc. thereto.
[68] The method of the present invention as mentioned above may be implemented by a software program and stored in a computer-readable storage medium such as CD- ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, and the like. Since this process may be readily carried out by those skilled in the art, details will not be provided herein.
[69] The present application contains subject matter related to Korean patent application
No. 2005-0097112, filed in the Korean Intellectual Property Office on October 14, 2005, the entire contents of which is incorporated herein by reference.
[70] While the present invention has been described with respect to certain preferred embodiments, it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the scope of the invention as defined in the following claims.

Claims

Claims
[1] A data service managing apparatus for a frequency band extension for accommodating a broadband Digital Multimedia Broadcasting (DMB) data service by using a basic DMB transmission system having a predetermined basic frequency band and an additional DMB transmission system having an additional frequency band other than the basic frequency band, comprising: a band confirming means for confirming a frequency band used for each data service; and a data distributing means for distributing service data to a system capable of processing the service data among the basic DMB transmission system and the additional DMB transmission system based on the frequency band confirmed by the band confirming means.
[2] The data service managing apparatus for the frequency band extension as recited in claim 1, wherein the band confirming means confirms whether the data service is a service using the basic band, a service using the additional band, or a service using both basic band and additional band based upon a data transmission rate of the data service.
[3] The data service managing apparatus for the frequency band extension as recited in claim 2, wherein the additional band is an upper band or a lower band of the basic band that is the frequency band of the basic DMB transmission system within a predetermined range.
[4] The data service managing apparatus for the frequency band extension as recited in claim 1, wherein, after the band confirmation in the band confirming means, the data distributing means distributes service data using the basic band to the basic DMB transmission system, service data using the additional band to the additional DMB transmission system, and service data using both basic band and additional band to a system capable of processing the service data among the basic DMB transmission system and the additional DMB transmission system based on a transmission rate of the service data.
[5] The data service managing apparatus for the frequency band extension as recited in claim 4, wherein the data distributing means adds identification information indicating that the service data is of a service using both basic band and additional band, and sequence information for data combination at a receiving end to the data to be distributed to the corresponding DMB transmission system using both basic and additional bands, and then distributes the data having the identification information and the sequence information to the corresponding DMB transmission system.
[6] A Digital Multimedia Broadcasting (DMB) data server for a frequency band extension, comprising: a data service managing means for confirming a frequency band used for each- data service, and bypassing service data to be processed in a basic band to a basic DMB transmission system and transmitting service data to be processed in an additional band to a data processing means; and the data processing means for processing the data provided from the data service managing means based on a DMB standard to generate a DMB broadcasting signal.
[7] The DMB data server for the frequency band extension as recited in claim 6, wherein the data service managing means includes: a band confirming means for confirming a frequency band used for each data service; and a data distributing means for bypassing service data using the basic band to the basic DMB transmission system, transmitting service data using an additional band to the data processing means to process the service data in the data distributing means, and distributing service data using both basic band and additional band to the data processing means or the basic DMB transmission system based on a frequency band.
[8] The DMB data server for the frequency band extension as recited in claim 7, wherein the data distributing means adds identification information indicating that the data is of a service using both basic band and additional band, and sequence information for data combination at a receiving end to the data to be distributed to the corresponding DMB transmission system using both basic band and additional band.
[9] The DMB data server for the frequency band extension as recited in claim 8, wherein the data processing means inserts the identification information and the sequence information into a Fast Information Channel (FIC) upon generation of the DMB broadcasting signal.
[10] A Digital Multimedia Broadcasting (DMB) receiving system for a broadband data service, comprising: a Radio Frequency (RF) processing means for receiving and converting an RF broadcasting signal into an Intermediate Frequency (IF) signal; a baseband processing means for converting the IF signal obtained in the RF processing means into a baseband signal; a data decoding means for decoding the baseband signal outputted from the baseband processing means, and combining data that is divided and serviced in accordance with a frequency band at a transmitting end; and an application service decoding means for providing an application service by using the data outputted from the data decoding means.
[11] The DMB receiving system for the broadband data service as recited in claim 10, wherein the data decoding means extracts identification information indicating that the service data is of a service using both basic band and additional band, and sequence information for data combination from an FlC during a decoding operation of the baseband signal, and combines the data based on the extracted information.
[12] The DMB receiving system for the broadband data service as recited in claim 11, wherein the RF processing means includes an RF processor for the basic band and an RF processor for the additional band to receive the RF broadcasting signal for each of the basic band and the additional band.
[13] The DMB receiving system for the broadband data service as recited in claim 12, wherein the baseband processing means is configured separately for each RF processor to process each of the signals outputted from the RF processor for the basic band and the RF processor for the additional band.
[14] The DMB receiving system for the broadband data service as recited in claim 11, wherein the RF processing means is a single broadband RF processing means for receiving a radio broadcasting signal without separating the basic band and the additional band.
[15] A data service managing method for a frequency band extension for accommodating a broadband DMB data service by using a basic DMB transmission system having a predetermined basic frequency band and an additional DMB transmission system having an additional frequency band other than the basic frequency band, comprising the steps of:
(a) confirming a frequency band used for each data service;
(b) if the data service is a service using the basic band, distributing service data to the basic DMB transmission system;
(c) if the data service is a service using the additional band, distributing service data to the additional DMB transmission system; and
(d) if the data service is a service using both basic and additional bands, distributing the service data to a system capable of processing the service data among the basic DMB transmission system and the additional DMB transmission system based upon a transmission rate of the service data.
[16] The data service managing method for the frequency band extension as recited in claim 15, wherein the step (a) confirms whether the data service is a service using the basic band, a service using the additional band, or a service using both basic band and additional band based upon a transmission rate of the service data.
[17] The data service managing method for the frequency band extension as recited in claim 15, wherein in the step (d), identification information indicating that the service is a service using both basic and additional bands and sequence information for data combination at a receiving end are added to the data to be distributed to the corresponding DMB transmission system.
EP06769135A 2005-10-14 2006-06-30 Data service managing apparatus and method for frequency band extension and dmb data server using the same and dmb receiving system for broadband data service Withdrawn EP1946547A4 (en)

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KR1020050097112A KR100733959B1 (en) 2005-10-14 2005-10-14 Data Service Management Apparatus and Method for extending frequency bandwidth, DMB Data Server using it, and DMB Receiving System for Broadband Data Service
PCT/KR2006/002568 WO2007043745A1 (en) 2005-10-14 2006-06-30 Data service managing apparatus and method for frequency band extension and dmb data server using the same and dmb receiving system for broadband data service

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101537557B1 (en) * 2013-12-24 2015-07-20 전자부품연구원 Transmitter of DRM broadcasting system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040022326A1 (en) * 2002-07-30 2004-02-05 John Morrish Digital audio receiver
US20040063399A1 (en) * 2002-09-27 2004-04-01 Marek Milbar Method and apparatus for interleaving signal bits in a digital audio broadcasting system
WO2005020576A1 (en) * 2003-08-20 2005-03-03 Electronics And Telecommunications Research Institute System and method for digital multimedia broadcasting
US20050099938A1 (en) * 1999-09-15 2005-05-12 Lucent Technologies Inc. Method and apparatus for multi-stream transmission with time and frequency diversity in an orthogonal frequency division multiplexing (OFDM) communication system
US20050141627A1 (en) * 2003-11-26 2005-06-30 Walker Glenn A. Method to create hierarchical modulation in OFDM

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3582979B2 (en) * 1997-02-26 2004-10-27 株式会社東芝 Communication device, communication method, and recording medium
KR100288149B1 (en) * 1997-08-25 2001-05-02 구자홍 Method and apparatus for transferring broadband data
JP2001144703A (en) * 1999-11-16 2001-05-25 Toshiba Corp Method for operating programs in data broadcasting and data broadcasting transmission system
JP2003060600A (en) * 2001-08-20 2003-02-28 Sony Communication Network Corp Data transmitting method and transmitter capable of using this method, and data receiving method and receiver capable of using this method
KR100739218B1 (en) * 2005-09-02 2007-07-13 노키아 코포레이션 Method, system and network entity for indicating hierarchical mode for transport streams carried in broadband transmission

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050099938A1 (en) * 1999-09-15 2005-05-12 Lucent Technologies Inc. Method and apparatus for multi-stream transmission with time and frequency diversity in an orthogonal frequency division multiplexing (OFDM) communication system
US20040022326A1 (en) * 2002-07-30 2004-02-05 John Morrish Digital audio receiver
US20040063399A1 (en) * 2002-09-27 2004-04-01 Marek Milbar Method and apparatus for interleaving signal bits in a digital audio broadcasting system
WO2005020576A1 (en) * 2003-08-20 2005-03-03 Electronics And Telecommunications Research Institute System and method for digital multimedia broadcasting
US20050141627A1 (en) * 2003-11-26 2005-06-30 Walker Glenn A. Method to create hierarchical modulation in OFDM

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
JIANG H ET AL: "A Hierarchical Modulation for Upgrading Digital Broadcast Systems", IEEE TRANSACTIONS ON BROADCASTING, IEEE SERVICE CENTER, PISCATAWAY, NJ, US, vol. 51, no. 2, 1 June 2005 (2005-06-01), pages 223-229, XP011132694, ISSN: 0018-9316, DOI: 10.1109/TBC.2005.847619 *
See also references of WO2007043745A1 *
TEN KATE W R T ET AL: "Digital audio carrying extra information", ICASSP 90. 1990 INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH AND SIGNAL PROCESSING (CAT. NO.90CH2847-2) IEEE NEW YORK, NY, USA, 1990, pages 1097-1100, XP002673836, DOI: 10.1109/ICASSP.1990.116125 *

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