KR20090029141A - Apparatus and method for supporing broadcast service - Google Patents

Abstract

A broadcast service providing apparatus and a method thereof are provided to shorten the channel conversion time by using an indicator for information the change of a P2 signal. In case a desired service is received, a terminal stores an indicator value from a received packet(600) and then checks information about the indicator value(602). The terminal checks whether channel conversion is requested(604). If so, the terminal checks whether the P2 is changed through the pre-stored indicator(606). If the P2 is changed, the terminal waits the channel conversion until the next frame is received, and then converts a channel in the next frame.

Description

Broadcast service providing device method {APPARATUS AND METHOD FOR SUPPORING BROADCAST SERVICE}

The present invention relates to an apparatus and method for transmitting and receiving data in a communication system, and more particularly, to an apparatus and method for transmitting and receiving data in a communication system using time frequency slicing (TFS).

In the information society of the 21st century, broadcasting and communication services are entering the age of full-fledged digitalization, multi-channelization, broadband, and high quality. In particular, with the recent expansion of high-definition digital TVs, PMPs, and mobile broadcasting devices, the demand for digital broadcasting services has also increased.

In response to these demands, DVB-T2 (Digital Video Broadcasting-Terrestrial), the second-generation terrestrial digital broadcasting standard for Europe, uses a reception method that recycles conventional home digital reception antennas and a reception method that uses multiple antennas to increase capacity. In addition, each standard for the three types of reception methods for the portable mobile terminal is in progress. This is because DVB-T / H, the first-generation terrestrial digital broadcasting standard, considers only two types of fixed / mobile reception methods, and considers the method of using multiple antennas, and the modification of the physical layer structure and control information accordingly is added. This is an inevitable situation. The control channel is a channel for transmitting a control message for a transmission scheme in the physical layer, and a modulation scheme, a code rate, a cell ID, and the like are transmitted therethrough. Since each piece of information is selected in consideration of the characteristics of the base station and coverage, the wireless channel situation, and characteristics of the receiving terminal, it is necessary to satisfy flexibility and diversity so that optimal control information can be selected for a very large environment. do.

1 is a diagram for describing a transmission method of a first generation broadcast system.

The transmitting station 100 is shown as transmitting a broadcast service for each of a plurality of RF. In FIG. 1, four RFs 110, 120, 130, and 140 are illustrated, and respective broadcast services are transmitted through the respective RFs 110, 120, 130, and 140. That is, in FIG. 1, broadcast services having identifiers 1 to 10 are transmitted through respective RFs 110, 120, 130, and 140. Then, the receiver 150 is a method of detecting a desired service by tuning to the RF containing the desired service. That is, when the user wants to receive the service 1, the user may tune to receive the RF1 110 and then receive the service 1 included therein.

2 is a diagram for describing a transmission scheme considered in a second generation broadcast system.

The transmitting station 200 transmits through a plurality of RF bands by dividing a long long packet by shorting the plurality of RF bands 210, 220, 230, and 240. That is, as shown in FIG. 2, it can be seen that broadcast service 1 is time-divided in all RF bands 210, 220, 230, and 240. Then, the receiver 250 may receive a desired broadcast service by tracking and detecting an RF band including the desired service. The case shown in the lower part of FIG. 2 illustrates the order of RF bands when the broadcast service 1 is received. When data is transmitted using the method shown in FIG. 2, time diversity and frequency diversity gain can be simultaneously obtained. This method is called TFS (Time-Frequency Slicing).

3 is a diagram illustrating a transmission frame standard of TFS.

Referring to FIG. 3, RF bands illustrate the same case as those of FIGS. 1 and 2. That is, it is shown as having four RF. 3 includes a program information transmission area 410 of P1 and P2 at the top of one frame. This information is information informing the location of the program. 3 illustrates a structure in which 10 service packets are transmitted in one RF. In FIG. 3, the frame is constructed by allocating all service packets to one RF. In addition, it can be seen that neighboring RFs are arranged in a form in which service packets are cyclically shifted from a specific RF. Information about the current frame is transmitted to P1 and P2 for each RF channel. For example, P1 may be used as a preamble, and information about each service in the current frame is transmitted to P2. That is, information about when each service starts and ends at which point is transmitted.

Such service information is used for channel switching. In more detail, when a user watching service 1 switches a channel to watch service 3, since a start time of service 3 is received in advance in the program information transmission area 410. The terminal can know the location of the service packet. Accordingly, the terminal can switch the channel within the same frame when the channel switch request is made.

However, when using the above method, when the same service is viewed, an indicator is used in each packet to transmit information on the RF and the start time of the next packet so that P1 and P2 are not transmitted every frame. This approach is effective if you continue to watch the same service.

On the other hand, when switching channels, the exact information about the RF and start time of the newly desired service is not known. Therefore, if one service packet is continuously received and another service packet is desired, it may wait until the next frame to receive information about a new desired service after receiving new P1 and P2. That is, the channel can be switched only by using new P1 and P2. In this case, therefore, the channel switching time can be increased. Since the reduction of channel switching time is an important factor every week in a broadcasting system, a study on a method of reducing channel switching time is required.

Accordingly, the present invention provides an apparatus and method capable of fast channel switching in a system for providing a broadcast service.

A transmission method according to an embodiment of the present invention is a frame transmission method in a broadcasting system using a time frequency slicing (TFS) method, comprising: configuring a broadcast program information area and setting a service packet for each radio frequency; And transmitting a packet of one frame by configuring program change information in at least one packet for each service packet included in one frame.

A receiving method according to another embodiment of the present invention is a frame receiving method in a broadcasting system using a time frequency slicing (TFS) method, which receives a broadcast program information region and stores identifier information for each broadcasting service in advance. And providing a broadcast service by receiving a desired service packet according to the broadcast program information, inspecting broadcast program change information in the received service packet, and providing broadcast program information only when instructing that broadcast program change information is subsequently changed. Receiving and storing again.

In the present invention, the channel switching time can be reduced by using an indicator indicating a change in the P2 signal.

Hereinafter, with reference to the accompanying drawings will be described in detail the operating principle of the preferred embodiment of the present invention. In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted if it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

4A and 4B are diagrams for describing an operation in a situation in which channel switching is required in a system using an indicator according to an exemplary embodiment of the present invention. First, in FIG. 4A and FIG. 4B, a P2 change indicator 401 which is both program information is included for each first packet of a frame. Therefore, when channel switching is required, channel switching varies according to the P2 change indicator which is program information.

4A is a diagram illustrating an operation when the P2 of the previous frame and the P2 of the current frame are the same.

In the case of FIG. 4A, the terminal receiving the service 1 checks whether the P2 is changed in the previous frame and the current frame when receiving the packet for the service 1. This information is hereinafter referred to as "program change information". The program change information is located in the first symbol of the packet as described above. In FIG. 4A, since the program change information does not change, since the P2 signal does not change when the user attempts to switch to channel 3 as shown in step 420, the terminal changes the RF to 410, which is being received. Without receiving the P2 information, the location of the packet for the channel 3 (service 3) in the same frame in step 411 from the P2 information previously stored in the information about the channel 3 to be found.

However, if the P2 signal is changed, it may not be possible to find a desired channel position in the same frame as in step 411. Therefore, the location of the packet for channel 3 (service 3) in the next frame. That is, when the program change information indicates that P2 changes in the next frame as shown in FIG. 4B, since information about service 3 may not be known in the same frame, the user waits until the next frame to receive P2 of the next frame and receives a new service 3. Make it watchable.

FIG. 5 is an exemplary diagram of a case where an indicator for a change of P2 is located in the last packet of a frame according to another embodiment of the present invention. In this case, whether P2 of the next frame changes or not is notified in advance so that P2 is unconditionally received when P2 changes in the next frame. Of course, if a channel switching request occurs in the next frame without receiving P2 in the next frame, it is natural that P2 may be received in the next frame and the converted service may be provided.

6 is a control flowchart when a terminal receives a service according to a first embodiment of the present invention.

The terminal receives the service in step 600. When receiving the desired service as described above, the terminal stores the indicator value according to the present invention in the packet received in step 602 and checks the information on the same. When the terminal stores the indicator value, the terminal stores not only an indicator of information of a desired service but also indicator information of other services supported by the current frame. While receiving and providing a desired service in this manner, the terminal proceeds to step 604 to check whether channel switching is required. The channel switch request in step 604 may be detected by the user requesting channel switch through a user interface provided in the terminal. If the channel switching is requested as a result of the check in step 604, the terminal proceeds to step 606 and checks whether P2 has changed through the indicator previously stored in step 602. When the test result P2 changes in step 606, the terminal proceeds to step 610 and waits for channel switching until reception of the next frame, and then switches channels in the next frame.

On the other hand, if the test result P2 in step 606 does not change, the terminal performs channel switching to receive a newly requested service in the current frame by using the indicator stored in step 602.

7 is a control flowchart when a terminal receives a service according to a second embodiment of the present disclosure.

The terminal receives the service in step 700. When receiving the desired service as described above, the terminal stores the indicator value according to the present invention in the packet received in step 702 and checks the information on it. When the terminal stores the indicator value, the terminal stores not only an indicator of information of a desired service but also indicator information of other services supported by the current frame. In step 704, the terminal checks P2 of the received frame and checks whether P2 changes in the next frame. If it is checked in step 704 that P2 is to be changed in the next frame, the terminal proceeds to step 708 to receive P2 in the next frame and stores various information provided by P2.

On the other hand, if P2 does not change in the next frame as a result of the inspection in step 704, P2 is not received. In FIG. 7, the channel switching is not illustrated. However, if switching of the channel is required in the current frame using the indicator information received and stored in the current frame, the channel may be switched using the stored indicator information. In addition, if it is indicated that a change of P2 is necessary before or after channel switching, P2 may be received and channel switching may be performed according to the newly received P2.

1 is a view for explaining a transmission method of a first generation broadcast system;

2 is a view for explaining a transmission scheme considered in a second generation broadcast system;

3 is a diagram illustrating a transmission frame standard of TFS;

4A and 4B are diagrams for describing an operation in a situation in which channel switching is required in a system using an indicator according to an embodiment of the present invention;

5 is an exemplary diagram of a case in which an indicator for a change of P2 is located in a last packet of a frame according to another embodiment of the present invention;

6 is a control flowchart when a terminal receives a service according to a first embodiment of the present disclosure;

7 is a control flowchart when a terminal receives a service according to a second embodiment of the present disclosure.

Claims (2)

In the transmission method of a frame in a broadcasting system using a time frequency slicing (TFS) method, Configuring a broadcast program information area and setting a service packet for each radio frequency; And transmitting the packet of one frame by configuring program change information in at least one packet for each service packet included in one frame. Receiving a frame in a broadcasting system using a time frequency slicing (TFS) method, Receiving the broadcast program information area and storing identifier information for each broadcast service in advance; Receiving a desired service packet according to the broadcast program information to provide a broadcast service, and checking broadcast program change information from the received service packet; And receiving and storing broadcast program information again only when the broadcast program change information is instructed to be changed later.

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