WO2007058067A1

WO2007058067A1 - Mobile communication terminal, digital broadcast complementing device, and digital broadcast complementing system

Info

Publication number: WO2007058067A1
Application number: PCT/JP2006/321709
Authority: WO
Inventors: Akira Kato
Original assignee: Murata Manufacturing Co., Ltd.
Priority date: 2005-11-16
Filing date: 2006-10-31
Publication date: 2007-05-24
Also published as: JP2007142677A

Abstract

A mobile telephone terminal (MS) radio communicating with a base station (BTS) and a digital broadcast complementing device (3) connected to the base station (BTS) are respectively enabled to receive broadcast. The mobile telephone terminal (MS) decodes a TS packet of digital broadcast, detects a packet ID of a TS packet which cannot be decoded, and radio transmits it as radio communication data via a mobile telephone line network to a digital broadcast complementing device (3). The digital broadcast complementing device (3) detects a TS packet corresponding to the received TS packet from a digital broadcast data storage, and transmits it as radio communication data via the mobile telephone line network to the mobile telephone terminal (MS). The mobile telephone terminal (MS) complements the digital broadcast by using the received TS packet so as to reproduce it for viewing.

Description

Specification

Technical Field of Mobile Communication Terminal, Digital Broadcast Complementary Device, and Digital Broadcast Complementary System

TECHNICAL FIELD [0001] The present invention relates to a portable communication terminal that performs wireless communication via a base station and receives and views a digital broadcast of broadcasting station power. Furthermore, the present invention relates to an apparatus and system on the base station side that provides a service for a mobile communication terminal that receives the digital broadcast.

Background art

[0002] Conventionally, various types of mobile communication terminals such as mobile phone terminals have been devised that can receive digital broadcasts such as television (TV) broadcasts and radio broadcasts that can be received not only by transmitting and receiving wireless communication data. Speak.

[0003] As a device having such circuits for wireless communication and digital broadcast reception in a single housing, there is a mobile phone terminal with a TV, and various services are provided with the start of terrestrial digital TV broadcast. It has been devised.

[0004] In Patent Document 1, electronic TV program information is obtained from a TV mobile phone terminal, displayed on the screen of a TV mobile phone terminal, and recorded on a video device installed at home. A configuration in which a command is transmitted via a mobile phone network in accordance with a user operation of a mobile phone terminal with TV is described.

[0005] Also, in Patent Document 2, for a digital TV broadcast content viewed by a user using a mobile phone terminal with TV, the content portion that the user missed is specified, and the content is Following the user operation of the service content that has been digest edited and edited at high speed, the mobile phone terminal with TV acquires it via the mobile phone network, and the user views the service content using the mobile phone terminal with TV. The configuration is shown. Patent Document 1: JP 2002-353915 A

Patent Document 2: JP 2004-349932 A

Disclosure of the invention Problems to be solved by the invention

[0006] By the way, as a feature of digital broadcasting such as digital TV broadcasting, it is possible to realize extremely excellent communication quality by performing multiple error correction coding (FEC).

However, a mobile communication terminal such as a mobile phone terminal with a TV is not capable of completely avoiding a bad reception state under the influence of digital broadcasting. Moving to, the noise, interference, and attenuation of the transmitted wave became stronger, and the reception status of digital broadcasting sometimes worsened.

[0008] When such a problem occurs, it is possible to re-view the broadcast using the techniques of Patent Document 1 and Patent Document 2 described above. There was also a strong demand for mobile phone terminals that can be watched in real time without interruption.

[0009] Further, when some service content is acquired as power wireless communication data such as a mobile phone network as in the service of Patent Document 2, the communication cost generally increases with the amount of information used. From this point, it is necessary to suppress the amount of information.

[0010] Therefore, an object of the present invention is to provide a mobile communication terminal in which digital broadcast viewing / playback can be performed continuously without interruption and the communication cost of wireless communication is suppressed. In addition, an apparatus and system for complementing the digital broadcast are provided.

Means for solving the problem

[0011] The present invention relates to a mobile communication terminal including a digital broadcast receiving unit that receives digital broadcast data broadcast from a broadcast station, and a wireless communication unit that transmits and receives wireless communication data to and from a base station. The digital broadcast receiving unit cannot correctly decode the digital broadcast data, and the wireless communication unit requests the wireless communication data as the wireless communication data, and acquires the data sequence acquisition means. Provided is a mobile communication terminal having a complementing means for complementing digital broadcast data with a data string and a viewing / reproducing means for viewing / reproducing the supplemented digital broadcast data.

[0012] With this configuration, a digital broadcast data string that cannot be correctly decoded is acquired as wireless communication data using a wireless communication network, and the digital broadcast data is supplemented. As a result, it is possible to perform continuous playback without interruption on mobile communication terminals, Since only data strings that cannot be decoded are acquired as wireless communication data, communication costs, particularly reception costs, can be suppressed. Also, digital broadcasts can be viewed and played continuously without requiring any operations that require viewer power.

[0013] Generally, in digital broadcasting, content data is encoded in a packet format determined by the MPEG (Moving Picture Experts Group) standard, and each packet has an individual identification code (packet ID). ) And FEC (Forward Error Correction) are added to the packet header.

[0014] Therefore, when receiving such a packet type digital broadcast, an error correction code is used.

Bit errors are corrected using (FEC), and packets (error packets) that cannot be decoded yet are acquired as wireless communication data via the wireless communication network in the present invention. Then, the error packet is replaced with a packet acquired as wireless communication data, and error correction is performed. As a result, the mobile communication terminal does not interrupt the viewing and playback due to the error packet, and the digital broadcast content data can be played back continuously. In addition, since the digital broadcast processing unit acquires only the packet corresponding to the error packet as wireless communication data, the communication cost, particularly the reception cost can be suppressed.

[0015] Further, in the mobile communication terminal of the present invention, the digital broadcast receiving unit includes a buffer for storing digital broadcast data before viewing and reproduction, and the complementing means stores the digital broadcast data stored in the buffer. In addition, the viewing / playback means plays back / plays the digital broadcast data output from the buffer.

[0016] In this configuration, digital broadcast data is stored in a noferer and complemented while existing in the data string S buffer with bit errors, so that the reception status of the digital broadcast is poor for the viewer. You can watch and play back digital broadcasts without having to be aware of any hesitation. By storing it in the chopper, viewing and playback of digital broadcasts can be completely eliminated in real time, but by setting the amount of time to be stored in the buffer to the minimum necessary level, the user can feel almost no stress and feel in real time. You can watch and play digital broadcasts.

[0017] When receiving packet-type digital broadcasts, some packets are stored in a notifier, and when an error packet occurs, the packet is stored as wireless communication data while the error packet is stored in the buffer. Is obtained and replaced with an error packet. Perform error correction.

[0018] In the mobile communication terminal of the present invention, the data string acquisition means detects an identifier for identifying a data string of digital broadcast data, and the wireless communication uses the identifier as wireless communication data. And means for receiving the data sequence of the digital broadcast data as wireless communication data by the wireless communication unit.

[0019] With this configuration, by detecting an identifier that identifies a data string having a bit error and transmitting only the identifier as wireless communication data, it is possible to suppress transmission cost, in particular, of the communication cost of wireless communication. .

[0020] When a packet-type digital broadcast is received, the packet ID added to the packet header is used as the identifier. That is, the transmission cost can be suppressed by detecting the packet ID of the error packet and transmitting only the packet ID as wireless communication data.

[0021] Further, the present invention is a digital broadcast complementing device configured to be communicably connected to a base station configured to be able to transmit and receive wireless communication data to and from a mobile communication terminal. A digital broadcast data storage that stores data; an identifier detection unit that detects an identifier from wireless communication data transmitted from a mobile communication terminal; and a data string of digital broadcast data corresponding to the identifier from the digital broadcast storage Provided is a digital broadcast complementing device comprising a data string detection unit and a data string transmission unit for transmitting the detected data string to the mobile communication terminal.

[0022] With this configuration, the digital broadcast complementing apparatus transmits a data string for viewing and reproducing the digital broadcast upon receiving the identifier. In this way, since only the identifier and the data string corresponding to the identifier are transmitted and received, the communication cost can be suppressed to the maximum.

[0023] When packet-type digital broadcasting is targeted, when a packet ID is received as wireless communication data, a packet corresponding to the packet ID is transmitted as wireless communication data. As a result, communication costs can be reduced for transmission / reception of only packet IDs and corresponding packets.

[0024] Also, the present invention provides a mobile communication terminal configured to be able to transmit and receive wireless communication data to and from a base station, and a digital broadcast complementing device configured to be communicably connected to the base station. Each can receive digital broadcast data broadcast from broadcast stations Comprising a digital broadcast supplement system, wherein the mobile communication terminal decrypts digital broadcast data, and stores the decrypted digital broadcast data in a buffer for a predetermined time before viewing and reproducing the digital broadcast data Means for detecting an identifier for identifying a data string that has not been correctly decoded from the decoded digital data; and transmitting the identifier as wireless communication data to the digital broadcast complementing apparatus. Means for detecting the identifier from the wireless communication data transmitted from the mobile communication terminal, and digitally broadcasting a data string of digital broadcast data corresponding to the detected identifier. Means for detecting from the digital broadcast data storage storing the broadcast data, and sending the detected data string to the portable communication terminal; Means for detecting the data sequence of the digital broadcast data from the radio communication data transmitted from the digital broadcast supplement device, and the data sequence of the detected digital broadcast data. Accordingly, there is provided a digital broadcast complementing system having means for complementing the digital broadcast data stored in the buffer and means for viewing and reproducing the digital broadcast data output from the buffer.

[0025] In the digital broadcast supplement system of the present invention, means for storing the information amount of the wireless communication data transmitted from the digital broadcast supplement device to the mobile communication terminal in association with the identification number of the mobile communication terminal. And means for calculating a charge amount according to the information amount of the wireless communication data stored in association with the identification number of the mobile communication terminal.

[0026] With these configurations, viewing and playback of digital broadcasting by the mobile communication terminal can be performed continuously without interruption. In addition, the communication cost of wireless communication data can be suppressed to the maximum, and an appropriate charge amount can be calculated for the amount of information and communication cost.

The invention's effect

[0027] According to the present invention, it is possible to perform viewing and playback of digital broadcasting by a mobile communication terminal in substantially real time without interruption. In addition, it is possible to reduce the communication cost of the wireless communication data and obtain an appropriate charge amount for the information amount and the communication cost. Brief Description of Drawings

FIG. 1 is a block diagram showing a digital broadcast supplement system according to a first embodiment.

FIG. 2 is a block diagram showing a digital broadcast supplement apparatus according to the first embodiment. [3] FIG. 3 is a block diagram showing the mobile phone terminal with TV according to the first embodiment.

FIG. 4 is a diagram illustrating an operation of the shift register according to the first embodiment.

FIG. 5 is a diagram illustrating an operation of a shift register according to another embodiment.

Explanation of symbols

1 public network

2—Broadcasting station

3—Digital Broadcast Complementary Device

10—Processor

11—RAM

12—Storage

14 One input device

15—Output device

17-Digital Broadcast Decor Department

100—Digital TV Broadcasting Department

101—TV antenna

102—Digital TV receiver

103, 303—Digital TV demodulator

104, 304—shift registers

105, 305—MPEG decoder

106— TS packet request part

200—Radio Communication Department

201—telephone antenna

202—Duplexer

203—Transmission circuit

204—Audio modulation circuit

205—Microphone

206—Receiving circuit

207, 307-Processor 208 Audio demodulation circuit

208 Audio demodulation circuit

209 Speaker

BSC base station controller

BTS base station

MS mobile phone

TS—TS packet

TSP—TS packet signal

CL Clock signal

LE—Load Enablef¾ 号

BEST MODE FOR CARRYING OUT THE INVENTION

[0030] A system including a mobile communication terminal and a digital broadcast complementing apparatus according to the first embodiment of the present invention will be described with reference to Figs.

First, FIG. 1 shows an overview of wireless communication and digital broadcasting according to the present embodiment.

In the present embodiment, description will be made based on an example of a mobile telephone terminal with TV that receives a digital TV broadcast in which TV content data is encoded in a TS (Transport Stream) packet format determined by the MPEG2 standard.

Here, the mobile station MS performs wireless communication with a base station (Base Transceiver Station) BTS in a cellular manner. In the cellular system, a base station BTS is installed for each cell that divides a wide service area into smaller areas.

[0032] A plurality of base stations BTS are connected to a base station controller BSC (Base Station Controller). As the mobile phone terminal MS moves, wireless communication is performed while a plurality of different base stations BTS cooperate (handover). This base station control device BSC is connected to a carrier line network to which it belongs, a fixed telephone line network, a carrier line network of another carrier, an IP line network used for the Internet, etc. Connect to the public network 1 such as

[0033] Broadcasting station 2 encodes digital TV content data that can be played back on mobile phone terminal MS in the TS packet format determined by the MPEG2 standard, and broadcasts it on broadcast radio waves. The

[0034] The mobile phone terminal MS is a mobile phone terminal with TV, and receives digital TV broadcast radio waves from the broadcast station 2 in addition to the above-described cellular radio communication. The TS packet is decoded from the received radio wave. However, in the present invention, if the radio wave condition is bad and the TS packet cannot be correctly decoded, the error packet is reacquired by wireless communication. Play content data with high quality.

[0035] On the other hand, a digital broadcast complementing device 3 is connected to the base station BTS. The digital broadcast supplementing device 3 receives the digital TV broadcast radio wave from the broadcast station 2, decodes the TS packet, and Remember. Further, the digital broadcast complementing apparatus 3 transmits a predetermined TS packet to the mobile phone terminal MS in accordance with a request signal from the mobile phone terminal MS. In addition, the mobile terminal ID of the mobile phone terminal MS and the number of TS packets transmitted to the mobile phone terminal MS are accumulated and stored.

[0036] As a result, in the present embodiment, the digital TV broadcast can be continuously viewed and reproduced on the mobile phone terminal MS without interruption, and the communication cost of the wireless communication data is suppressed and the amount of information is reduced. In addition, it is possible to obtain an appropriate billing amount for the communication cost.

Next, the configuration of the digital broadcast supplement apparatus 3 will be described based on the block diagram shown in FIG.

The digital broadcast complementing device 3 receives a powerful processing unit 10 such as a CPU and ROM (not shown) that controls the overall operation of the device 3, a storage 12 that stores application programs, and broadcast radio waves. A digital broadcast decoding unit 17 for decoding TS packets. A predetermined number of TS packets decoded by the digital broadcast decoding unit 17 are stored in the storage 12 as necessary. Further, the digital broadcast complementing device 3 includes a RAMI 1 for loading each program stored in the storage 12! /. This RAMI 1 is a volatile memory that temporarily stores data. It is also connected to other devices in the base station BTS via the communication control interface (IF) 16. In addition, an input / output control interface (IF) 13 is connected to an input device 14 such as a mouse and a keyboard, an output device 15 such as a printer and a monitor, and a storage media recording / reproducing device (not shown).

[0038] With such a configuration, the processing unit 10 has various application programs stored in the storage 12. Load the gram on RAMI 1 and execute the process.

[0039] Specifically, the digital broadcast data decoded by the digital broadcast decoding unit 17 is stored in the storage 12 for each TS packet, and the request signal strength received via the communication control IF 16 also obtains the packet ID. Processing to store the packet ID in the storage 12, search the TS packet, associate the searched TS packet with the mobile terminal ID of the mobile phone terminal MS that sent the request signal, and send a response signal Is generated and transmitted to the base station BTS via the communication control IF16, and the number of TS packets transmitted to the mobile phone terminal MS and the mobile terminal ID are stored in the storage.

Next, a part of the configuration of the mobile phone terminal with TV MS according to the present embodiment will be described based on the block diagram shown in FIG.

[0041] The mobile phone terminal with TV MS includes a digital TV broadcast receiving unit 100 and a wireless communication unit 200.

The digital TV broadcast receiver 100 includes a TV antenna 101, a digital TV receiver 102, a digital TV demodulator 103, a shift register 104, an MPEG decoder 105, and a TS packet request unit 106.

The wireless communication unit 200 includes a telephone antenna 201, a duplexer 202, a transmission circuit 203, a sound modulation circuit 204, a microphone 205, a reception circuit 206, a processor 207, a sound demodulation circuit 208, and a speaker 209.

Note that, here, the processor 207 is illustrated so as to include the processor 207 in the wireless communication unit 200. The processor 207 is a processor such as an MPU that performs control processing of the entire mobile phone terminal MS including the digital TV broadcast receiving unit 100. However, in this case, the processor 207 may perform processing related to digital TV broadcasting as well as processing related to wireless communication.

[0042] In normal mobile communication, when the user terminal starts a call, when the user performs a call operation by operating an operation unit (not shown), the processor 207 is based on the telephone number information of the other party. Call start request information is generated, converted into digital data, and modulated by a transmission circuit 203 into a modulated signal for wireless communication. The modulation signal for wireless communication carrying the call start request information is transmitted from the telephone antenna 201 via the duplexer 202. [0043] On the other hand, when the own terminal receives a transmission signal of call start request information from another terminal, the receiving circuit 206 demodulates the modulation signal of the wireless communication carrying the transmission signal, and the processor 207 transmits the signal. Analyze the signal and display the other party's phone number on the liquid crystal display (not shown). If the user performs an operation for permitting the start of a call on the operation unit, the processor 207 generates a response signal, converts the response signal into digital data, and outputs the digital data to the transmission circuit 203. The transmission circuit 203 modulates digital data based on the response signal into a modulated signal for wireless communication, and transmits the modulated data from the telephone antenna 201 via the duplexer 202.

In the case of call processing, the microphone 205 receives the user's utterance, digitally converts it by the audio modulation circuit 204, and outputs it to the transmission circuit. The transmission circuit modulates the digitally converted audio signal into a radio communication modulation signal and outputs the modulated signal from the telephone antenna 201 via the duplexer 202. Also, when a radio communication modulation signal carrying a voice signal from the other party is received by the telephone antenna 201, it is input to the reception circuit 206 via the duplexer 202, and the reception circuit 206 demodulates the response signal. The demodulated response signal is reproduced by the audio demodulation circuit 208 and output to the speaker 209.

[0045] When watching a TV program, when the TV antenna 101 receives a broadcast wave of a digital TV broadcast, the TV TV receiving unit 102 outputs a baseband signal obtained by converting the broadcast wave. Here, the digital TV receiver 102 is configured with a direct conversion RF circuit, and the baseband signal is divided into two channels: an I signal (In—phase signal) and a Q signal (Q uadrature—phase signal). Output separately.

The baseband signal is output from the digital TV receiving unit 102 to the digital TV demodulating unit 103. The digital TV demodulator 103 demodulates and decodes the error correction code (FEC) to convert the baseband signal into an MPEG format TS packet.

[0047] The converted TS packet is output from digital TV demodulation section 103 to shift register 104.

The shift register 104 is a device having a large number of flip-flops that delays digital data by a predetermined number of bits, and stores TS packets bit by bit in order for a predetermined time. The shift register 104 serves as a buffer for storing digital broadcast data. The detailed operation will be described later.

[0048] When there is almost no error in the TS packet demodulated by the digital TV demodulator (error packet TS packet stored in the shift register 104 is output to the MPEG decoder 105 as it is. The MPEG decoder 105 decodes the content data from the TS packet, reproduces the video signal and the audio signal, and outputs them to a liquid crystal display unit (not shown). The liquid crystal display unit displays video on the display screen and outputs audio from a speaker (not shown).

[0049] When the TS packet cannot be correctly decoded, the TS packet request unit 106 detects the occurrence of the error packet and acquires the packet ID of the error packet. If the packet ID of the error packet itself cannot be decrypted, the packet ID of the error packet is identified from the packet IDs of the preceding and succeeding TS packets and output to the TS packet request unit 106. TS packet request section 106 converts the packet ID into a TS packet request signal together with its own terminal identification code (mobile terminal ID), and outputs it to transmission circuit 203 of radio communication section 200. Note that the function of the TS packet request unit 106 may be realized by the processor 207.

In radio communication section 200, a TS packet request signal is modulated by transmission circuit 203 and output from telephone antenna 201 via duplexer 202.

[0051] The request signal output from the telephone antenna 201 is input to the digital broadcast supplement apparatus 3 via the base station BTS. The digital broadcast complementing device 3 shown in FIG. 2 searches the storage 12 for a TS packet corresponding to the packet ID detected from the request signal. The retrieved TS packet is transmitted to the mobile phone terminal MS according to the mobile terminal ID included in the request signal. The mobile station ID is detected by the base station BTS. The digital broadcast complementing device 3 can be configured not to input a mobile terminal ID. In this case, the base station BTS stores the mobile terminal ID and the packet communication amount in order to calculate the billing amount. Good.

[0052] The mobile phone terminal MS shown in FIG. 3 receives a modulation signal for radio communication carrying a TS packet transmitted from the digital broadcast complementing device 3 via the base station BTS. The receiving circuit 206 also demodulates the TS packet with the received modulation signal power of wireless communication. The processor 207 identifies the TS packet, and outputs the identified TS packet to the digital TV broadcast receiving unit 100 instead of the audio decoding circuit 208 as a TS packet signal TSP by 1 bit. In the digital TV broadcast receiving unit 100, the TS packet signal TSP input from the processor 207 is replaced with an error packet stored in the shift register 104. This allows TS buckets without bit errors. Only the data is output from the shift register 104 to the MPEG decoder 105. The MPEG decoder 105 decodes the video digital data from the TS packet without any bit error, reproduces the video signal and the audio signal, and outputs them to a liquid crystal display (not shown). The liquid crystal display unit displays the input video signal on the display screen and outputs sound from a speaker (not shown).

[0053] Thereby, viewing / playback can be performed continuously without interruption, and the mobile phone terminal receives only the error packet, so that the reception cost of wireless communication can be suppressed. Moreover, since only the packet ID is transmitted, the transmission cost can be suppressed.

Next, the operation of the shift register 104 will be described with reference to FIG.

In FIG. 4, to simplify the explanation, the shift register 104 is displayed with a smaller number of stored bits. In addition, for convenience of illustration, the TS packet (TS) sequence length can be explained as 6 bits. Actually, TS packets of ISDB-T standard and DVB-T standard have a sequence length of 188 bytes or 204 bytes. Therefore, if the number of bits of the shift register 104 is set to be several times the sequence length of the packet, that is, several hundred to several tens of thousands of bits, the shift register 104 is configured to always store several packets to several hundred packets. Is preferred.

[0056] The shift register 104 is a device that stores digital data by a predetermined number of bits, and stores the TS packet signal TSP serially input bit by bit from the digital TV demodulator 103, bit by bit in the cycle of the Clock signal. , Which is sent from the end. Here, the clock signal CL synchronizes the digital TV demodulator 103 and the processor 207. In addition, the clock signal is input from the digital TV demodulator 103 to the shift register 104, but it may be configured so that other circuit power is input!

[0057] Shift register 104 delays TS packet signal TSP by a predetermined time determined by the number of bits stored therein and the frequency of Clock signal, and outputs TS packet signal TSP bit by bit. Here, if the number of bits stored in the shift register 104 is M [bit] and the frequency of the Clock signal CL is f [Hz], the TS packet signal TSP is delayed by the time of MZf [s]. . This delay time (MZf [s]) may be set based on the time required to obtain the TS packet using the above-described wireless communication.

[0058] The processor 207 obtained the error packet stored in the shift register 104. When replacing with a TS packet, set Load Enable terminal LE to Enable and rewrite the TS packet signal TSP corresponding to the rewrite terminal corresponding to the bit at the position of the error packet among the multiple rewrite terminals connected to the parallel. . The location and timing of the terminal to which this rewrite signal is applied should be configured to be grasped using the processor 207, other integrated circuits, counters, etc.

[0059] As described above, TS packets are stored in the shift register 104, and in order to complement the TS packets while being stored in the shift register 104, the reception status of the digital broadcast is given to the viewer. There is no need to be aware of what is wrong, and digital broadcasts can be played back continuously without requiring any manipulation of viewer power.

Next, the setting of the TS packet delay time by the shift register 104 will be described.

[0061] The delay time of the TS packet by the shift register 104 is preferably set to a time necessary for obtaining the TS packet as wireless communication data. Total time of the time required for wireless communication with the telephone terminal MS, the time required for communication between the base station BTS and the digital broadcast supplement device 3, and the internal processing time of the digital broadcast supplement device 3. Approx.

[0062] When the digital broadcast supplement device 3 is directly connected to the base station BTS as in this embodiment, the time required for communication between the base station BTS and the digital broadcast supplement device 3 is almost ignored. it can.

[0063] In addition, among the TS packets stored in the storage, the digital broadcast complementing apparatus 3 deletes the TS packets stored for a predetermined time and stores them in the shift register of the mobile phone terminal MS to several hundreds. If only the packet is stored in the storage, the time required to search for the TS packet can be reduced. In this case, the internal processing time of the digital broadcast supplement device 3 can be almost ignored. The process of deleting this TS packet can be realized as an application program by the processing unit.

[0064] In addition, the time required for wireless communication between the base station BTS and the mobile phone terminal MS can be calculated by assuming that the maximum round-trip distance in the cell between the base station and the mobile phone terminal is X [m]. The maximum is XZC [s]. Where C is the speed of light (C [mZs]).

[0065] Therefore, the time required for communication between the base station BTS and the digital broadcast supplementary device 3, and the digital When the internal processing time of Tal Broadcast Complementary Device 3 is reduced, the TS packet delay time by shift register 104 is reduced by the time required for wireless communication between base station BTS and mobile phone terminal MS. Therefore, the delay time (MZf [s]) of the shift register 104 with the period of the aforementioned Clock signal as f [Hz] and the bit length of the shift register as M [bit] It is preferable to set the maximum time (XZC [s]) required for wireless communication with the mobile phone terminal MS.

[0066] As described above, in the present embodiment, storage in the digital broadcast complementing apparatus 3 is performed by receiving broadcast waves. Note that the present invention is not limited to this embodiment, and can be implemented even when the broadcasting station 2 and the digital transmission complementing device 3 perform wired communication using an optical cable or the like. If the broadcaster and the wireless carrier are the same, use the storage media to keep the digital TV content data consistent between the broadcaster 2 and the digital broadcast supplement device 3. It is also possible. In this case, communication between the broadcast station 2 and the digital broadcast supplement device 3 is not necessarily required.

[0067] In the present embodiment, the digital broadcast complementing apparatus 3 is connected to the base station BTS, but the digital broadcast supplementing apparatus 3 does not necessarily need to be connected to the base station BTS. It may be connected to the device BSC. This eliminates the need to connect the digital broadcast supplementary device 3 to all the cellular base stations BTS, thereby reducing the total number of digital broadcast supplementary devices 3 to be installed. In this case, the delay time by the shift register 104 of the mobile phone terminal MS may be the maximum time including the communication time between the base station controller BSC and the base station BTS.

[0068] Further, the digital broadcast supplementary device 3 may be connected to the base station control device BSC via the public network 1. Furthermore, it is preferable to connect the digital broadcast complementing device 3 via the IP line network, so that a general IP multicast server device can be used as the digital broadcast supplementing device 3. In this case, the time required for the base station BTS to communicate with the base station controller BSC via the public network 1 is added to the delay time before the TS packet of the mobile phone terminal MS is reproduced. In this case, it is preferable to use a large-capacity storage such as a magnetic storage device instead of the shift register 104. Even if a magnetic storage device is used, the TS packet bit string is forwarded. In addition, bit rewriting can be realized by processing using the processor 207 or a logic circuit or MPU provided separately.

[0069] Next, a mobile phone terminal MS according to another embodiment will be described. Figure 5 shows a mobile phone terminal

FIG. 5 is a diagram for explaining the operation of an MS shift register 304;

In FIG. 5, the shift register 304 is displayed with a smaller number of stored bits in order to simplify the explanation as in FIG. The sequence length of the TS packet (TS) is assumed to be 6 bits.

The cycle of the Clock signal CL from the digital TV demodulator 303 is output to the processor 307 together with the shift register 304. Here, the Clock signal CL is synchronized with the processor 307 and the digital TV demodulator 303, and the power input from the digital TV demodulator 303 to the shift register 304 is also input. You may comprise.

[0072] When decoding of the TS packet is not performed correctly, the TS packet signal TSP is obtained by wireless communication by the processor 307, and the processor 307 shifts the obtained TS packet signal TSP. Replace with the error packet stored in register 304. Specifically, the processor 307 temporarily stores the obtained TS packet signal TSP in a latch or memory, and also connects the TS packet signal TSP to the rewrite terminal connected to correspond to the terminal bit of the shift register 304. Rewrite with packet signal TSP and enable Load Enable terminal LE. This rewrite timing is the timing of each bit where each bit of the error packet is located at this end bit. Even in this case, replacement of the TS packet (TS) using the shift register 304 can be performed, and only the TS packet (TS) can be output to the MPEG decoder 305 without any bit error. By rewriting the bit at the end of the shift register 304, the delay time by the shift register 304 becomes proportional to the number of bits. The above processing performed by the processor 307 may be performed by a logic circuit or MPU. It can be implemented regardless of the configuration.

[0073] As described above, TS packets are stored in the shift register 304, and in order to complement the TS packets while being stored in the shift register 304, the viewer is in a state of receiving digital broadcasting. There is no need to be aware of what is wrong, and digital broadcasts can be played back continuously without requiring any manipulation of viewer power. The present invention is not limited to the MPEG2 standard digital TV broadcast shown in each of the above embodiments, but other MPEG4 standards related to contents, ISDB standards related to digital broadcasts, DVB standards, other contents (such as radio), etc. However, the present invention can be implemented even with various digital broadcasts, and any digital broadcast that receives packet digital broadcasts is suitable. Further, any terminal that performs wireless communication via a base station, which is not limited to the mobile phone terminal shown in each of the above embodiments, is suitable.

Claims

The scope of the claims

[1] In a mobile communication terminal comprising a digital broadcast receiving unit that receives digital broadcast data broadcast from a broadcasting station and a wireless communication unit that transmits and receives wireless communication data to and from the base station.

A data string acquisition means for requesting and acquiring a data string of digital broadcast data that cannot be correctly decoded by the digital broadcast receiver, and a complement means for complementing the digital broadcast data with the acquired data string; And a viewing / reproducing means for viewing / reproducing the complemented digital broadcast data.

[2] The digital broadcast receiver includes a buffer for storing digital broadcast data before viewing and reproduction,

2. The portable communication terminal according to claim 1, wherein the complementing means complements the digital broadcast data stored in the buffer, and the viewing / reproducing means views / reproduces the digital broadcast data output from the buffer.

[3] The data string acquisition means includes means for detecting an identifier for identifying a data string of digital broadcast data, means for transmitting the identifier as wireless communication data in the wireless communication unit, and The mobile communication terminal according to claim 1 or 2, further comprising: means for receiving a data string as wireless communication data by the wireless communication unit.

[4] A digital broadcast complementing device configured to be communicably connected to a base station configured to be able to transmit and receive wireless communication data to and from a mobile communication terminal,

A digital broadcast data storage storing digital broadcast data; an identifier detection unit for detecting an identifier from wireless communication data transmitted from a mobile communication terminal; and a data string of digital broadcast data corresponding to the identifier from the digital broadcast storage. A digital broadcast complementing apparatus comprising: a data string detection unit that detects; and a data string transmission unit that transmits the detected data string to the mobile communication terminal.

[5] Includes a mobile communication terminal configured to be able to transmit and receive wireless communication data to and from a base station, and a digital broadcast complement device configured to be communicably connected to the base station, each broadcast from a power broadcast station A digital broadcast supplement system configured to receive received digital broadcast data, The mobile communication terminal decodes the digital broadcast data, means for storing the decoded digital broadcast data in a buffer for a predetermined time before viewing and playing back, and decoding the decoded digital data Among them, it has a means for detecting an identifier for identifying a data string, and a means for transmitting the identifier as wireless communication data to a digital transmission complementing device, which can be correctly decoded.

The digital broadcast complementing device stores means for detecting the identifier from wireless communication data transmitted from the mobile communication terminal, a digital broadcast data sequence corresponding to the detected identifier, and stores digital broadcast data Means for detecting from the digital broadcast data storage, and means for transmitting the detected data string to the portable communication terminal,

The portable communication terminal is further stored in the buffer by means for detecting a data string of digital broadcast data from wireless communication data transmitted from the digital broadcast complementing device and a data string of the detected digital broadcast data. A digital broadcast complementing system comprising: means for completing the digital broadcast data; and means for viewing and reproducing the digital broadcast data output from the buffer.

The digital broadcast supplement system according to claim 5,

Means for storing the information amount of wireless communication data transmitted to the mobile communication terminal by the digital broadcast complementing apparatus in association with the identification number of the mobile communication terminal;

Means for calculating a charge amount according to the amount of wireless communication data stored in association with the identification number of the portable communication terminal.