KR20130003299A - Handover method of digital broadcast mobile receiving - Google Patents

Abstract

PURPOSE: A channel scan handover method using broadcasting station name information of a network information table in digital broadcasting mobile reception of a self regional management method capable of accurately determining whether there is an identical broadcasting of TS(Transport Stream) data received from a neighboring base station is provided to solve a problem that a current broadcast is stopped and a totally different broadcast is received while performing handover of digital broadcasting mobile reception. CONSTITUTION: A digital broadcasting receiver extracts a program association table from broadcast TS data(S120). The digital broadcasting receiver reads a network information table from the broadcast TS data with reference to the program association table(S130). The digital broadcasting receiver obtains a text including a broadcasting station name from the network information table(S140). The digital broadcasting receiver recognizes the broadcasting station name from the text(S150). If the broadcasting station name is identical with a predetermined broadcasting station name, the digital broadcasting receiver recognizes the broadcast TS data including the broadcasting station name as a corresponding broadcast and receives the broadcast TS data(S160). [Reference numerals] (AA) Start; (BB) End; (S100) Receiving digital broadcasting signals; (S110) Extracting broadcasting TS data from the digital broadcasting signals; (S120) Extracting PAT(program association table) from the broadcasting TS data; (S130) Reading NIT(network information table) from the broadcasting TS data, refer to the PAT; (S140) Acquiring a text containing a broadcasting station name from the NIT; (S150) Recognizing the broadcasting station name from the text containing a broadcasting station name; (S160) Receiving the broadcasting TS data as corresponding broadcasting if the recognized broadcasting station name is identical with a predetermined broadcasting station name

Description

Handover method of digital broadcasting mobile reception {HANDOVER METHOD OF DIGITAL BROADCAST MOBILE RECEIVING}

The present invention relates to a handover technology for digital broadcast mobile reception, and particularly preferably, a network unique ID and a transmission from a broadcast TS data received while traveling between areas in the handover of the Japanese digital broadcasting standard ISDB-T. The present invention relates to a handover technology for digital broadcast mobile reception implemented such that the same broadcast reception is maintained by detecting and comparing a portion of text indicating a station name in addition to the stream ID.

As digital broadcasting gradually replaces analog broadcasting, high-definition image services are becoming possible. In addition, it is not only providing a high quality screen but also providing additional information related to a broadcast program and other broadcasts.

Digital broadcasting services can be classified into two types, fixed digital broadcasting and mobile digital broadcasting. Fixed digital broadcasting is a method of receiving digital broadcasting through a TV terminal or a digital broadcasting through a wired medium such as a cable or the Internet in a fixed place through the air as in the conventional analog broadcasting. It is possible to watch high-definition digital broadcasting without inconvenience in the area where the airwaves are well received or where the wired media is well installed.

On the other hand, in the case of mobile digital broadcasting, there are many technical problems to be solved because high-quality digital broadcasting must be received while moving rapidly. In particular, the broadcast signal received from the broadcasting base stations installed in each region should be appropriately selected, and when the digital broadcasting terminal moves from the corresponding base station service area to the adjacent base station service area during broadcasting viewing, the broadcast is tuned to the new channel of the neighboring base station. This must be maintained endlessly. At this time, a function of automatically changing a channel from the base station to the adjacent base station is called a handover function.

In the case of digital broadcast mobile reception according to the Japanese digital broadcasting standard ISDB-T, broadcasts are generally distinguished by using a specific identifier assigned to each broadcast when performing a handover. However, at this time, since the assigned identifier consists of a sequence of constant numbers, there is a problem that a number of broadcasts and a number of regions may be accidentally overlapped when an identifier is assigned to a number of broadcasts.

In fact, the same identifier is found in the actual field even though it is a different broadcast at the time of mobile reception of a Japanese digital broadcast, and because the broadcast has the same identifier even though it is a different broadcast, when the handover is performed, the broadcast being watched is disconnected and changed to a completely different broadcast. There is a problem that occurs.

An object of the present invention is to solve the problem that the current broadcast is interrupted and a completely different broadcast is received during the handover of digital broadcast mobile reception according to the Japanese digital broadcasting standard ISDB-T. It is to provide a handover technology of digital broadcast mobile reception that can be maintained as it is.

In accordance with another aspect of the present invention, there is provided a method for handover of digital broadcast mobile reception, comprising: (A) receiving a digital broadcast signal; (B) extracting broadcast TS data from the digital broadcast signal; (C) extracting a program related table from broadcast TS data; (D) reading a network information table from broadcast TS data with reference to a program related table; (E) obtaining a text including a broadcasting station name from the network information table; (F) recognizing the station name in the text; And (G) recognizing and receiving broadcast TS data including the broadcast station name as the corresponding broadcast when the broadcast station name matches the preset broadcast station name.

In the handover method for digital broadcast mobile reception according to the present invention, step (E) preferably includes obtaining a text including a broadcast station name from a network information table through a network name descriptor.

Further, in the handover method of digital broadcast mobile reception according to the present invention, step (F) comprises: determining the presence or absence of a delimiter for distinguishing between a broadcasting station name and a local name in the text; And separating and extracting the broadcast station name from the text based on the delimiter.

In the handover method of digital broadcast mobile reception according to the present invention, step (E) further includes identifying a network unique ID and a transport stream ID from a network information table, and (F) includes a separator. If not, the network unique ID and the transport stream ID is preferably configured to further include the step of recognizing and receiving broadcast TS data corresponding to the preset information as the corresponding broadcast.

According to the handover method of the present invention, it is possible to accurately determine whether the broadcast TS data received from the neighboring base stations are the same broadcast, thereby preventing the broadcast currently being watched from being changed to another broadcast during the handover and maintaining the same broadcast. It works.

1 is a conceptual diagram schematically showing a handover method of digital broadcast mobile reception;
2 is a flowchart showing the overall operation of the handover method for digital broadcast mobile reception according to the present invention;
FIG. 3 is a flowchart illustrating in more detail an operation process of obtaining information necessary to maintain the same broadcast from a network information table (NIT) in FIG. 2 (S140);
FIG. 4 is a flowchart illustrating in more detail an operation process of recognizing a broadcasting station name through information obtained from a network information table (NIT) in FIG. 2 (S150).

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the following description, it is preferable to refer to the document 'JAPAN ARIB STD-B21v4_6' for more detailed matters related to the Japanese digital broadcasting standard ISDB-T.

1 is a conceptual diagram schematically illustrating a handover method for digital broadcast mobile reception.

When receiving a digital broadcast fixed in a certain place such as a home television, a radio wave is received over a very wide range, or a digital broadcast is received using a cable. Therefore, in this situation, it is not necessary to consider the reception problem caused by the movement of the digital broadcast receiver.

However, in order to receive digital broadcasting in a situation of rapidly moving a location such as a train or a sightseeing bus, a large number of base stations for transmitting a broadcast over a limited area range are required, and there are other technical problems to be solved. In addition, since the digital broadcasting receiver crosses an area and an area while moving at a high speed through a vehicle, a handover operation must be performed in which the current broadcast is maintained even when the base station is changed.

As shown in FIG. 1, while the digital broadcasting receiver moves from region A to region B, the digital broadcast receiver passes through the region where region A and region B overlap. At this time, when the broadcast signal of the A region base station becomes weaker as the digital broadcasting receiver enters the B region, the digital broadcast receiver should receive the broadcast signal of the B region instead of the broadcast signal of the A region. In addition, the broadcast content being watched should remain the same.

To this end, while changing from the frequency of the base station in the region A to the frequency of the base station in the region B, the network unique ID (original_network_id) and the transport stream ID (transport_stream_id) are checked from the broadcast signal of the region B base station to determine whether the broadcast is the same. To change the channel.

In this case, when the region A and the region B are compared, broadcast contents are often completely different even though they have the same or very similar network unique ID and transport stream ID. That is, although the broadcasting is different, a network unique ID and a transport stream ID may be coincidentally matched.

Accordingly, in order to prevent this, a broadcast station name is additionally obtained from a network information table (NIT) included in broadcast TS data, and used as a criterion for determining whether the content is the same.

According to the MPEG-2 standard, the contents of the network information table (NIT) are defined as a personal space where a user can freely set additional information. Therefore, the digital broadcasting service provider can set it arbitrarily, and according to the 'JAPAN ARIB STD-B21v4_6' document according to the Japanese digital broadcasting standard ISDB-T, the information such as the network unique ID (original_network_id) and transport stream ID (transport_stream_id) is included. It is prescribed.

In addition, the network information table (NIT) is allocated a space that can be freely set by the broadcaster, and when the broadcaster integrates the broadcaster name and the local name and includes certain text as the network name in the network information table (NIT), The same text may be determined with reference to the corresponding text.

That is, the digital broadcast receiver analyzes the contents of the text including the broadcast station name in addition to the method of using the network unique ID (original_network_id) and the transport stream ID (transport_stream_id) to determine whether the same broadcast is performed and performs handover.

2 is a flowchart showing the overall operation of the handover method for digital broadcast mobile reception according to the present invention.

First, the digital broadcast receiver is implemented in a manner of being installed in a vehicle such as a bus, a train, a car, or a personal mobile phone to receive a digital broadcast signal while moving (S100).

Next, the digital broadcast receiver extracts broadcast transport stream (TS) data from the digital broadcast signal (S110). At this time, demodulation of the modulated wave, error correction, frame reconstruction, energy despreading, and the like are performed.

At this time, a PID value is allocated to each broadcast TS data. A program association table (PAT) is extracted from the broadcast TS data with reference to the PID value (S120). The program related table (PAT) is information of a TS stream and includes PIDs such as a program map table (PMT), a conditional access table (CAT), and a network information table (NIT). Contains a value.

Next, the digital broadcast receiver reads information such as a program map table PMT, a network information table NIT, and the like by referring to a program related table PAT (S130). The program map table (PMT) describes information indicating the video PID and the audio PID of a program. In addition, the network information table (NIT) describes information on modulation frequency and transmission path, information on the physical configuration of the network, characteristics of the network itself, and the like. Text is further described.

Next, the digital broadcast receiver obtains information necessary for maintaining the same broadcast from the network information table NIT (S140). That is, text information including a network unique ID (original_network_id), a transport stream ID (transport_stream_id), and a broadcast station name is obtained.

The reason for acquiring the text information including the broadcasting station name is that the network unique ID (original_network_id) and the transport stream ID (transport_stream_id) are insufficient to guarantee whether they are the same broadcast, and there are cases where an error actually occurs. This point has been described with reference to FIG. 1.

Next, the digital broadcast receiver analyzes the content of the obtained text information to recognize the broadcast station name (S150). The obtained text information may include additional network information in addition to the pure broadcast station name. Therefore, only pure broadcast station names are extracted separately and used to determine whether they are the same. More details will be described later with reference to FIG. 4.

If the pure broadcast station name extracted through the above process coincides with the preset broadcast station name, the currently received broadcast TS data is recognized as the corresponding broadcast and received (S160). Accordingly, the digital broadcast receiver receives broadcast TS data including the corresponding broadcast station name and outputs a screen and a voice through the terminal so that the viewer can seamlessly watch the same broadcast.

FIG. 3 is a flowchart illustrating in more detail an operation process of obtaining information necessary to maintain the same broadcast from a network information table (NIT) in FIG. 2 (S140).

The digital broadcast receiver identifies a network unique ID (original_network_id) and a transport stream ID (transport_stream_id) from a network information table (NIT) through a network information section (network_information_section ()) command defined in the ISDB_T standard (S141).

Further, text including a broadcast station name is obtained from the network information table NIT through a network_name descriptor () command defined in the ISDB_T standard (S142).

For more information about the network information section (network_information_section ()) and network name descriptor (network_name descriptor ()), refer to the document 'JAPAN ARIB STD-B21v4_6' according to the Japanese ISDB-T standard.

The text including the obtained network unique ID (original_network_id), transport stream ID (transport_stream_id), and broadcast station name is used to move the channel by finding the same broadcast station by properly combining them at the time of handover.

FIG. 4 is a flowchart illustrating in more detail an operation process of recognizing a broadcasting station name through information obtained from a network information table (NIT) in FIG. 2 (S150).

The previously obtained text information includes a region name in addition to the pure broadcast station name, and may be set to distinguish between the pure broadcast station name and the region name by displaying a separator such as a dot ('.'). Therefore, it is necessary to separate pure broadcast station names based on the delimiter.

First, the digital broadcast receiver determines whether or not there is a delimiter for distinguishing between a broadcasting station name and a local name in text (S151).

If there is a separator, the broadcaster name is separated from the text based on the recognized separator and extracted (S152). Thereafter, it is determined whether the same broadcast station is based on the extracted pure broadcast station name.

However, if there is no delimiter, it is not easy to distinguish between a broadcasting station name and a local name. Therefore, it is determined that only the network unique ID (original_network_id) and transport stream ID (transport_stream_id) match the preset information, and the broadcast TS data is transmitted to the corresponding broadcast. It is preferable to determine whether or not the same broadcast station is recognized and received (S153).

In this case, even if there is no delimiter, if it is possible to acquire pure broadcast station names in various ways such as sequentially matching pure broadcast station names in the acquired text or cutting the length of pure broadcast station names, the network unique ID (original_network_id). ) And the transport stream ID (transport_stream_id) may be combined with a pure broadcast station name to more accurately find the same broadcast station and implement channel movement.

Although the present invention has been described in more detail with reference to the examples, the present invention is not necessarily limited to these embodiments, and various modifications can be made without departing from the spirit of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

Claims (4)

(A) receiving a digital broadcast signal;
(B) extracting broadcast TS data from the digital broadcast signal;
(C) extracting a program related table from the broadcast TS data;
(D) reading a network information table from the broadcast TS data with reference to the program related table;
(E) obtaining text including a broadcasting station name from the network information table;
(F) recognizing a broadcasting station name in the text; And
(G) if the broadcasting station name matches a preset broadcasting station name, recognizing and receiving broadcast TS data including the broadcasting station name as the corresponding broadcasting;
Handover method of digital broadcast mobile reception comprising a.
The method according to claim 1,
The step (E) is characterized in that it comprises the step of obtaining a text containing the broadcast station name from the network information table via a network name descriptor.
The method according to claim 1 or 2,
Step (F) is
Determining the presence or absence of a delimiter for distinguishing between a broadcasting station name and a local name in the text; And
Separating and extracting a broadcasting station name from the text based on the delimiter;
Handover method for digital broadcast mobile reception, characterized in that comprises a.
The method according to claim 3,
The step (E) further includes identifying a network unique ID and a transport stream ID from the network information table.
The step (F) may further include recognizing and receiving broadcast TS data corresponding to the preset information when the network unique ID and the transport stream ID do not exist, when the delimiter does not exist. Handover method of broadcast mobile reception.

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