KR101253108B1 - Channel-scanning handover method for digital mobile broadcasting using broadcasting company name information in network information table in autonomous zone managing environment - Google Patents

Abstract

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 technique for maintaining the same broadcast reception by detecting and comparing a portion of text indicating a broadcast station name in addition to a stream ID. According to the handover technique of the present invention, it is possible to accurately determine whether the broadcast TS data received from a neighboring base station is the same broadcast, thereby preventing the broadcast currently being watched from being changed to another broadcast when the handover is performed, and maintaining the same broadcast. There is.

Description

CHANNEL-SCANNING HANDOVER METHOD FOR DIGITAL MOBILE BROADCASTING USING BROADCASTING COMPANY NAME INFORMATION IN NETWORK INFORMATION TABLE IN AUTONOMOUS ZONE MANAGING ENVIRONMENT}

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 technique for maintaining the same broadcast reception by detecting and comparing a portion of text indicating a broadcast station name in addition to a stream ID.

As digital broadcasting gradually replaces analog broadcasting, high-definition image services are becoming possible. In addition to providing a high-quality screen, it is also possible to supply additional information related to broadcast programs 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 in a fixed place through the airwaves or through a wired medium such as a cable or the Internet like 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, mobile digital broadcasting has a lot of technical problems because it must be received during high-speed digital broadcasting of high quality. 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 the broadcast viewing, it is tuned to the new channel of the neighboring base station so that the broadcasting viewing is not stopped. It must be maintained without. At this time, a function of automatically changing a channel from a corresponding base station to an adjacent base station is called a handover.

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 when the Japanese digital broadcast is received. Since the same identifier is found 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 specific ID and the transport stream ID is preferably configured to further include the step of recognizing and receiving broadcast TS data corresponding to the predetermined information as the corresponding broadcast.

According to 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.

1 is a conceptual diagram schematically showing a handover 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 a process (S140) of obtaining information necessary for maintaining the same broadcast from NIT in FIG. 2;
FIG. 4 is a flowchart illustrating a process of recognizing a broadcasting station name through information obtained from the NIT in FIG. 2 (S150).

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In the following description, it is preferable to refer to the document "JAPAN ARIB STD-B21v4_6" for details on 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, it receives a radio wave over a very wide range or receives a digital broadcast 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 do this, while changing the frequency of the region A base station from the frequency of the region B base station, the network unique ID (original_network_id) and transport stream ID (transport_stream_id) are checked from the broadcast signal of the region B base station to check whether the broadcast is the same. Change it.

In this case, when the area A and the area 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. In other words, although the broadcast is different, a network ID and a transport stream ID may be coincidentally matched.
As such, a method of managing broadcast identification information (network unique ID, transport stream ID, etc.) for each region in its own way is not referred to as an “autonomous region management method” in this specification. In the autonomous region management scheme, a network ID and a transport stream ID may collide with each other even though they are different broadcast programs, and the present invention is based on such a situation.

Therefore, 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 arbitrarily set, and according to the document "JAPAN ARIB STD-B21v4_6" according to the Japanese digital broadcasting standard ISDB-T, it is prescribed to include information such as a network unique ID and a transport stream ID.

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 content of the text including the broadcast station name in addition to the method of using the network unique ID and the 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 such a manner as to be 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, the program related table PAT is extracted from the broadcast TS data with reference to the PID value allocated for each broadcast TS data (S120). The program related table PAT is PID information such as a program map table PMT, a reception limit table CAT, a network information table NIT, and the like, which is a reference of the TS stream.

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, a transport stream ID, and a broadcasting station name is obtained.

In this case, the reason for obtaining the 'text including the broadcasting station name' information is because there is a shortage of guaranteeing whether the same broadcast is provided only by the unique network ID and the transport stream ID, 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 broadcasting station name extracted through the above process matches the preset broadcasting station name (that is, the broadcasting station name of the previous base station), the currently received broadcasting TS data is recognized as the corresponding broadcasting 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 an operation process of obtaining information necessary to maintain the same broadcast from the NIT (S140) in FIG. 2 in more detail.

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

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

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

The text including the network unique ID, the transport stream ID, and the broadcast station name obtained above 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 the 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 broadcasting station 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, by determining whether the network information matches the preset information using only the network unique ID and the transport stream ID, the broadcast TS data is recognized and received as the corresponding broadcast (S153). It is desirable to determine whether the same station.

In this case, even if there is no separator, if it is possible to acquire pure broadcast station names in various ways such as sequentially matching pure broadcast station names in the obtained text or cutting the length of pure broadcast station names, the network unique ID and transport stream ID may be used. In addition, it is also possible to implement a combination of the pure broadcast station name to accurately find the same station to move the channel.

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)

As a method for providing handover through channel scanning in a digital broadcasting mobile reception environment of an autonomous region management method,
(A) detecting a change in base station according to local movement from fluctuation of broadcast signal in digital broadcasting mobile receiving environment of autonomous regional management;
(B) initiating a channel search corresponding to the base station change;
(C) receiving a digital broadcast signal to extract broadcast TS data;
(D) reading a network information table (NIT) with reference to a program related table (PAT) of the broadcast TS data;
(E) obtaining text including a network unique ID, a transport stream ID, and a broadcast station name from the network information table (NIT);
(F) recognizing a delimiter for distinguishing between a broadcasting station name and a local name in the text including the acquired broadcasting station name, thereby recognizing the broadcasting station name from the text including the broadcasting station name;
(G) After the base station is changed by recognizing the broadcast TS data whose information of the obtained network unique ID, transport stream ID and the recognized broadcast station name matches the information obtained by the base station before the base station change as a handover target broadcast program; Receiving on;
Channel scan handover method using the broadcasting station name information in the network information table in the digital broadcasting mobile reception of the autonomous region management system comprising a.
The method according to claim 1,
Step (E),
Obtaining the network unique ID and the transport stream ID from the network information table (NIT) through a network information section;
Obtaining a text including the broadcast station name from the network information table (NIT) through a network name descriptor;
Channel scan handover method using the broadcasting station name information in the network information table in the digital broadcasting mobile reception of the autonomous region management method comprising a
The method according to claim 1 or 2,
(H) If the delimiter for distinguishing the broadcaster name from the local name is not identified in the text including the acquired broadcast station name, only the obtained network unique ID and the transport stream ID correspond to information obtained at the base station before the base station change. Recognizing broadcast TS data as a handover target broadcast program and receiving it after the base station change;
The channel scan handover method using the broadcasting station name information in the network information table in the digital broadcasting mobile reception of the autonomous region management system further comprises. delete

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