KR20090076704A - Mobile broadcasting receiver method for searching channel of mobile broadcasting receiver - Google Patents

Abstract

A mobile broadcasting receiver and a method of searching a channel of the mobile broadcasting receiver are provided to write serviceable channels in a channel list, there removing inconvenience that a channel is searched again whenever handover occurs. A tuning unit(11) tunes a frequency band of a service transmitting channel and a frequency band of an adjacent transmitting channel. A channel is scanned through the tuning. A comparator(12) compares receive sensitivity of the scanned channel with a threshold value. A memory(13) stores information about a channel which is greater than a threshold value. An output unit(14) writes a channel list and displays the channel list on a screen.

Description

Channel Search Method for Mobile Broadcast Receiver and Mobile Broadcast Receiver {MOBILE BROADCASTING RECEIVER METHOD FOR SEARCHING CHANNEL OF MOBILE BROADCASTING RECEIVER}

The present invention relates to a channel search method of a mobile broadcast receiver and a mobile broadcast receiver.

Recently, the need and demand for a mobile broadcast receiver capable of viewing digital broadcasting even when the user is on the go is increasing. For example, mobile broadcast receivers are mobile phones, portable terminals such as personal digital assistants (PDAs), or vehicle terminals. The user can access various digital multimedia signals such as video and sound transmitted through digital broadcasting through high quality and high definition broadcasting through the mobile broadcasting receiver.

Standards of digital broadcasting technology used by mobile broadcast receivers include Advanced Television System Committee (ATSC) and Digital Video Broadcasting (DVB). ATSC is a standard developed in the United States, and DVB is a standard developed in Europe.

DVB is characterized by increased sharing of various media, including cable television, satellite, terrestrial, and satellite master antenna television (SMATV). Signal encoding and compression can be performed using standard MPEG-2 (Moving Picture Experts Group-2) standards to compress and multiplex images at standard or high resolution. DVB includes satellite digital broadcast DVB-S (Satellite), digital cable broadcast DVB-C (Cable) and terrestrial digital broadcast DVB-T (Terrestrial).

In general, digital radio broadcasting networks allocate different frequency bands to regions due to interference problems of the same frequency, and digital radio broadcasting networks include several channels in one frequency band. Therefore, a change in the frequency band and channel that can be received in each region is accompanied by the movement of the mobile broadcast receiver that receives digital wireless broadcast. The mobile broadcast receiver must change the frequency band and channel every time it moves to an area using different frequency bands and channels. This change process is called handover or handoff.

If a user scans a channel to watch digital wireless broadcasting with a conventional mobile broadcasting receiver and then goes out of an output range of a transmission station serving a corresponding channel, it is troublesome to perform channel search again to receive channels of a new transmission station.

The first technical problem to be solved by the present invention is to provide a mobile broadcast receiver.

A second technical problem to be solved by the present invention is to provide a channel searching method of a mobile broadcast receiver.

In order to solve the first technical problem, in one aspect of the present invention, a channel by tuning a frequency band of a service station channel transmitting a digital broadcast signal and a frequency band of a neighboring station channel adjacent to the service station A tuning unit for scanning a memory; a comparator comparing a received sensitivity of a channel scanned by the tuning unit with a threshold; a memory storing information about a channel determined to be greater than the threshold by the comparator; and a channel stored in the memory. It provides a mobile broadcast receiver comprising an output unit for creating a channel list by using the information on, and displays the channel list on the screen.

In another aspect of the present invention, in order to solve the second technical problem, in a mobile broadcast receiver for receiving digital broadcast, the frequency band of the service station channel for transmitting the digital broadcast signal and the neighboring station channel adjacent to the service station Scanning a channel by tuning a frequency band of the method and comparing the received sensitivity of the scanned channel with a threshold storing information about a channel determined to be greater than the threshold and storing the information on the stored channel It provides a channel search method of a mobile broadcast receiver comprising the step of creating a channel list using the information on the.

As described above, the present invention can provide a channel searching method of a mobile broadcast receiver and a mobile broadcast receiver. Since the tuning unit scans not only the channels of the service dispatch station but also the channels of the neighboring neighboring dispatch stations, the serviceable channels are created in the channel list, thereby avoiding the need to search for the channel again whenever a handover occurs. Can watch the receivable channels at any time, regardless of handover.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like numbers refer to like elements throughout.

1 is a diagram illustrating a mobile broadcast receiver according to an embodiment of the present invention.

Referring to FIG. 1, the mobile broadcast receiver 10 is located in a service cell C100 of a service dispatch office 20-100.

The service cell C100 of the service dispatch office 20-100 is an area capable of receiving a channel of a frequency band used by the service dispatch office 20-100. The service cells C100 are the first to sixth neighboring cells C1, C2,... Which are the service areas of the first to sixth neighboring stations. , C6) are neighbors.

Each of the service dispatch office 20-100 and the first to sixth neighboring dispatch offices 20-1, 20-2, ..., 20-6 adjacent to the service dispatch office 20-100 are different frequency bands, respectively. Use channels to prevent cross-channel interference between each service area.

Since the mobile broadcast receiver 10 is movable, the mobile broadcast receiver 10 may move from the currently located service cell C100 to the first to sixth neighboring cells C1, C2,..., C6.

For example, when the mobile broadcast receiver 10 moves from the service cell C100 to the neighboring third neighbor cell C3, the mobile broadcast receiver 10 transmits the frequency band of the reception channel to the service dispatch office 20-100. ) Handover, which is a switching process of changing from the frequency band of the channel to the frequency band of the third adjacent transmission station 20-3 channel, is required.

In the case of the conventional mobile broadcast receiver, in order to receive the broadcast signal transmitted by the service dispatch office 20-100, the mobile broadcast receiver scans the channel and tunes to the channel of the service dispatch office 20-100. When a handover occurs from the serving cell C100 to the third neighbor cell C3, the mobile broadcast receiver scans the channel again to match the channel of the third neighboring transmission station 20-3. Conventional mobile broadcast receivers search for channels again whenever a handover occurs.

The mobile broadcast receiver 10 of the present invention outputs a broadcast on the screen of the mobile broadcast receiver 10 in a moving state, while the service dispatch station 20-100 channel and the first to sixth neighboring dispatch stations 20-1, 20-2, ..., 20-6) Scan channels at regular time intervals. The received sensitivity of the scanned channel is compared with a threshold to store information about a channel determined to be greater than the threshold, and when the user wants to change the channel, the stored channel information is displayed as a channel list, and a handover and Can watch the receivable channels at any time.

2 is a block diagram of a mobile broadcast receiver according to an embodiment of the present invention.

Referring to FIG. 2, the mobile broadcast receiver 10 includes a tuning unit 11, a comparator 12, a memory 13, and an output unit 14. The mobile broadcast receiver 10 may further include a controller 15.

The tuning unit 11 scans a channel by tuning a frequency band at regular time intervals. The tuning unit 11 is not only the frequency band of the channel used by the service transmission station 20-100 located in the mobile broadcast receiver but also adjacent to the service station 20-100 adjacent to the service station 20-100. -2, ..., 20-6) scan the channel by tuning the frequency band of the channel used by changing the frequency.

The comparator 12 compares the received sensitivity of the channel scanned by the tuning unit 11 with a threshold. The threshold is preferably set to the minimum reception sensitivity required for the mobile broadcast receiver 10 to normally receive the broadcast.

The memory 13 stores information on a channel determined to have a reception sensitivity greater than a threshold among the channels scanned by the comparator 12.

The output unit 14 creates a channel list by using information about the channel stored in the memory 13 when a user request is made. The output unit 14 outputs the created channel list and displays it on the screen.

The control unit 15 controls the above components, including the tuning unit 11. In particular, when the user requests a channel list, the controller 15 controls the output unit 14 to display the channel list prepared by the output unit 14 on the screen.

The mobile broadcast receiver 10 may further include a user interface unit (not shown) for allowing a user to request a channel list.

3 is a flowchart illustrating a channel searching method of a mobile broadcast receiver according to another embodiment of the present invention.

Referring to FIG. 3, the channel search method of the mobile broadcast receiver 10 (refer to FIG. 1) for receiving digital broadcasts includes a service transmission station 20-100 (refer to FIG. 1) in which the tuning unit 11 transmits a digital broadcast signal. Scanning the channel by tuning the frequency band of the channel and the frequency bands of the adjacent polling station channels 20-1, 20-2, ..., 20-6 adjacent to the service dispatch office 20-100 ( S10, comparing the received sensitivity of the scanned channel with the threshold in the comparator 12 with a threshold value, and storing information about the channel determined to be greater than the threshold value in the memory 13, S30. In step S40, the output unit 14 creates a channel list using the stored channel information.

All of the above functions may be performed by a processor such as a microprocessor, a controller, a microcontroller, an application specific integrated circuit (ASIC), or the like according to software or program code coded to perform the function. The design, development and implementation of the code will be apparent to those skilled in the art based on the description of the present invention.

Although the present invention has been described above with reference to the embodiments, it will be apparent to those skilled in the art that the present invention may be modified and changed in various ways without departing from the spirit and scope of the present invention. I can understand. Therefore, the present invention is not limited to the above-described embodiment, and the present invention will include all embodiments within the scope of the following claims.

1 is a diagram illustrating a mobile broadcast receiver according to an embodiment of the present invention.

2 is a block diagram of a mobile broadcast receiver according to an embodiment of the present invention.

3 is a flowchart illustrating a channel searching method of a mobile broadcast receiver according to another embodiment of the present invention.

** Explanation of symbols in main part of drawing **

10: mobile broadcast receiver

11: tuning section

13: memory

14: output unit

Claims (5)

A tuning unit for scanning a channel by tuning a frequency band of a service station channel for transmitting a digital broadcast signal and a frequency band of an adjacent station station adjacent to the service station; A comparator comparing the received sensitivity of the channel scanned by the tuning unit with a threshold; And And a memory configured to store information on the channel determined by the comparator to be greater than the threshold. The mobile broadcast receiver of claim 1, further comprising an output unit configured to create a channel list by using information about the channel stored in the memory and to display the channel list on a screen. The mobile broadcast receiver of claim 2, further comprising a controller configured to control the output unit to display the channel list on a screen when a user requests the channel list. In a mobile broadcast receiver that receives digital broadcasts, Scanning a channel by tuning a frequency band of a service station channel transmitting a digital broadcast signal and a frequency band of a neighboring station channel adjacent to the service station; Comparing a received sensitivity of the scanned channel with a threshold; And And storing information on the channel determined to be greater than the threshold. 5. The method of claim 4, further comprising: creating a channel list by using the stored channel information.

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