JP2000138630A - Data communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transmit a series of data to a destination without failure even when a data communication device utilizing a public radio communication system to send the continuous data leaves the service zone. SOLUTION: A hard disk 16 tentatively stores data S15 that cannot be sent from a video camera 11 under the control of a system control circuit 31 for a period when a service zone identification section 24 identifies that the radio communication device stays outside the service zone, and data S 16 having been stored in the hard disk are transferred to a destination when the identification section 24 judges that the device has moved into the service zone. Furthermore, the device is provided with a residual capacity alarm section 32, which prevents such a situation that the video camera becomes suddenly out of service because the residual capacity of the hard disk expires when the device stays outside the service zone for a long time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data communication device suitable for using a public wireless line.

[0002]

2. Description of the Related Art Conventionally, digital portable telephone systems including a personal handy phone system (PHS) have been developed.
Due to the high degree of freedom in the place of use, use in business etc. is expanding.

[0003] These digital portable telephone systems are configured to include a large number of base stations, and the communicable range (service area) of each base station is, for example, several hundred meters or several kilometers in radius. They are arranged appropriately.

[0004] In the above-described digital cellular phone system, as shown in FIG. 3, a mobile station terminal 1 and a nearest base station 2 are connected via a UHF band wireless line WL.
Then, via the base station 2 and the network 3, a connection is made to a desired destination such as the server 4.

[0005]

By the way, IMT-2000 and MMAC which are to be realized in the near future
In a next-generation mobile phone system such as (Multimedia Mobile Access Communication), for example, several M to several tens Mb
A high transmission rate of ps is adopted.

[0006] When a mobile radio communication system with such a high transmission rate is used, a video camera 6 is connected to a mobile station terminal 1 as shown in FIG. It is possible to send a large amount of continuous data such as video in real time,
If the server 4 stores the moving image data from the video camera 6 in the large-capacity data storage unit 5, the video camera 6 can save much longer time without being limited by the capacity of the built-in recording medium. Can be taken.

However, when photographing using the above-described high transmission rate mobile radio communication system,
When moving in a relatively wide range, the mobile station terminal may go out of the service area of the base station and the wireless line may be disconnected, which causes a problem that shooting opportunities are significantly limited.

In view of the above, an object of the present invention is to provide a method for transmitting a large amount of continuous data, such as a moving image, through a mobile radio communication system having a high transmission rate when a mobile station terminal goes out of a communicable area. Another object of the present invention is to provide a data communication device capable of transmitting a series of required data to a destination without loss.

[0009]

To solve the above-mentioned problems, a data communication apparatus according to the first aspect of the present invention comprises: a wireless communication means for communicating with a base station having a predetermined communicable range via a wireless line; A data communication device comprising: a data generation unit that generates continuous data to be supplied to the wireless communication unit; a data storage unit that stores the continuous data; a communication range identification unit that identifies inside and outside of the communication range; Control means for switching between data reading and data storage of the data storage means in response to the communicable range identification means, and an alarm for issuing an alarm when the remaining capacity of the data storage means is less than a predetermined value. It is characterized in that a capacity alarm means is provided.

[0010] In the data communication apparatus according to the first aspect of the present invention, while the apparatus is out of the wireless communication service area, required data that cannot be transmitted is temporarily stored in the storage means. When the device moves into the wireless communication service area, the stored required data is transferred to the destination, so that a series of required data is transferred to the destination without any loss and is outside the service area. When the period is long, a situation in which the remaining capacity of the data storage unit becomes zero and the data generation unit becomes unusually unusable can be avoided by the remaining capacity alarm.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a data communication device according to the present invention will be described with reference to FIG.

[Structure of Embodiment] FIG. 1 shows the structure of an embodiment of the present invention.

As shown in FIG. 1, the data communication device of this embodiment comprises a data processing system 10, a communication system 20, and a control system 30.

In the data processing system 10, moving image data S11 from a video camera 11 having a CCD
The audio data S13 from the microphone 13 is supplied to the MPEG audio encoder 14 and subjected to a predetermined compression process, while being supplied to the EG2 video encoder 12 and subjected to a predetermined compression process.

M output from both encoders 12 and 14
A multiplexer (multiplexer) 1 is composed of a PEG2 video packet S12 and an MPEG audio packet 14.
5 to be multiplexed.
The multiplexed packet data S15 output from 5 is temporarily written to a large-capacity hard disk 16.

In the communication system 20, the transmission circuit 21 and the acknowledgment signal receiving section 22 are connected to the antenna 23 via a shared circuit (not shown). The multiplexed packet data S16 is supplied.

The writing and reading of the hard disk 16 are performed in a first-in first-out format, so-called FIFO (Firs
t-in, First-out).

In the control system 30, a control signal is supplied from a system control circuit (microcomputer) 31 to a remaining capacity alarm unit 32 including, for example, a red lamp and a buzzer, and the system control circuit 31 and the hard disk 16 The transmission and reception of the control data is performed between and.

Further, the communication system 2 is transmitted from the system control circuit 31 to the communication system 2.
The control signal is supplied to 0, and the confirmation signal S22 from the receiving unit 22 is supplied to the system control circuit 31.

[Data Transmission of Embodiment] Next, data transmission of the embodiment of FIG. 1 will be described.

In the embodiment shown in FIG. 1, it is assumed that the hard disk 16 is blank in the initial state. When shooting by the video camera starts, the multiplexed packet data S15 output from the multiplexer 15
6 is stored.

The stored packet data is sequentially read from the hard disk 16 under the control of the system control circuit 31, and transmitted from the transmission circuit 21 of the communication system 20 to the reception side (server) via the wireless line WL. Sent.

When the mobile terminal device is located outside the service area of the nearest base station, the hard disk 16 is temporarily set to the read mode by a control signal from the system control circuit 31 based on control information corresponding to the amount of data stored in the hard disk 16. The packet data read first is supplied to the transmission circuit 21 of the communication system 20 and transmitted from the antenna 23.

In this case, since the mobile terminal is located outside the service area of the base station and the wireless line WL is not connected,
Since the packet data read first cannot be transmitted to the server normally, the acknowledgment signal receiving unit 22 cannot receive the acknowledgment signal from the server. Then, by the control signal supplied from the system control circuit 31, the hard disk 16 is set in the read inhibition mode, and the reading of the subsequent packet data is inhibited.

When the mobile terminal device moves and returns to the service area of the nearest base station, the wireless circuit WL is connected and packet data is normally transmitted from the transmission circuit 21. Then, an acknowledgment signal (ACK) notifying the completion of the transmission of the correct data is transmitted, and reaches the acknowledgment signal receiving unit 22.

The confirmation signal S supplied from the receiving unit 22
The control signal is supplied from the system control circuit 31 to the hard disk 16 based on the control information corresponding to the amount of data stored in the hard disk 16 and the hard disk 1.
6 is released, and subsequent packet data is sequentially extracted.

In this way, all of the packet data stored in the hard disk 16 is transferred to the server via the transmission circuit 21 and the wireless line WL, and the packet data having no loss in the server-side data storage unit (see FIG. 3). Is accumulated.

Further, following shooting outside the service area, the multiplexed packet data S15 is stored in the hard disk 16
When the remaining capacity becomes zero, unexpected shooting interruption may occur.

In this embodiment, the hard disk 16
When the filling rate of the system exceeds a predetermined threshold, the system control circuit 3
1 is supplied to the remaining capacity alarm unit 32,
For example, a red lamp is lit or a buzzer sounds to warn the user that the remaining capacity of the hard disk 16 is low.

Thus, the user can use the hard disk 1
6, it is possible to recognize that the remaining capacity of the hard disk 16 is small, to stop the shooting before the remaining capacity of the hard disk 16 becomes zero, and to cope with an unexpected interruption of the shooting.

As described above, in the embodiment of FIG. 1, while the mobile terminal device including the continuous data generation unit such as a video camera is out of the wireless communication service area, the required data that cannot be transmitted is transmitted. A series of required data is lost by temporarily storing the data on a hard disk provided in the mobile terminal device and transferring the stored required data to the other party when moving into the wireless communication service area. The data can be transferred to the destination without using the wireless communication service, and the continuous data generation unit can be used outside the wireless communication service area.

In the embodiment shown in FIG. 1, a remaining capacity alarm unit is provided to prevent a sudden interruption of shooting when the remaining capacity of the hard disk becomes zero.

[Configuration of Another Embodiment] Next, another embodiment of the data communication apparatus according to the present invention will be described with reference to FIG.

FIG. 2 shows the configuration of another embodiment of the present invention. In FIG. 2, portions corresponding to those in FIG. 1 are given the same reference numerals, and a description thereof is partially omitted.

The data communication apparatus of the embodiment shown in FIG. 2 also comprises a data processing system 10A, a communication system 20A and a control system 30, as in the above-described embodiment.

In the data processing system 10A, moving image data S11 from a video camera 11 having a CCD
The audio data S13 from the microphone 13 is supplied to the MPEG audio encoder 14 while being supplied to the PEG2 video encoder 12.

M output from both encoders 12 and 14
The PEG2 video packet S12 and the MPEG audio packet 14 are supplied to a multiplexer 15.

The above configuration is the same as that shown in FIG.

In the embodiment shown in FIG.
5 is supplied to the movable contact of the changeover switch 17. The a-side fixed contact of the switch 17 and the second changeover switch 18
A-side fixed contact is connected, and both switches 1
The d-side fixed contacts 7 and 18 are respectively connected to the input terminal and the output terminal of the first-in first-out type hard disk 16. The movable contact of the switch 18 is connected to the transmission circuit 21.
Is connected to the input terminal.

In the communication system 20A of the embodiment shown in FIG. 2, the transmission circuit 21 and the service area identification unit 24 are connected to the antenna 23 via a shared circuit (not shown). The output S24 is supplied to the system control circuit 31.

In the control system 30, control data is exchanged between the system control circuit 31 and the hard disk 16, and a control signal is supplied from the system control circuit 31 to the communication system 20A and the remaining capacity alarm unit 32. At the same time, a common switching control signal is supplied to both of the linked switches 17 and 18.

[Data Transmission of Another Embodiment] Next, data transmission of the embodiment of FIG. 2 will be described.

In the embodiment of FIG. 2, when the mobile terminal device is located within the service area of the nearest base station, predetermined control information is constantly transmitted from the base station through the control channel of the wireless line WL. . In the service area outside identification unit 24 of the communication system 20A, for example, it is determined whether or not the mobile terminal device is located within the service area of the base station based on the strength of the electric field strength of the received control information.

It is assumed that the hard disk 16 is blank in the initial state, as in the above embodiment.

In the embodiment of FIG. 2, when the mobile terminal device is located in the service area of the base station, the received control information has a strong electric field strength, and the identification section 24 outputs an identification signal of the service area. . By the control signal from the system control circuit 31 based on this area identification signal, the movable contacts of both switches 17 and 18 are changed as shown by the solid line in FIG.
Each is connected to the a-side fixed contact.

When the video camera 11 starts shooting, the multiplexed packet data S15 output from the multiplexer 15 is supplied to the transmission circuit 21, transmitted to the server via the wireless line WL, and sequentially stored in the data storage unit. Is accumulated in

When the mobile terminal device moves and goes out of the service area of the base station, the electric field strength of the received control information becomes weak, and the identification unit 24 outputs an out-of-service area identification signal. This out-of-service identification signal and the hard disk 1
6, the movable contacts of both switches 17, 18 are switched to the d-side fixed contacts, respectively, as shown by the dotted line in FIG. At the same time, the hard disk 16 is set to the write mode, and the multiplexed packet data S15 output from the multiplexer 15 is sequentially written to the hard disk 16.

For example, if the mobile terminal device is out of the service area of the base station until the video shooting by the video camera 11 is completed, and the mobile terminal device further moves and returns to the service area of the base station after the shooting is completed, it is received. The electric field intensity of the control information becomes stronger, and the identification unit 24 outputs an identification signal of the service area.

The area identification signal and the hard disk 16
The control signal from the system control circuit 31 based on the control information corresponding to the accumulated data amount
The movable contacts 7 and 18 are maintained in the connection state shown by the dotted line in FIG. 2, and the hard disk 16 is switched to the transfer mode.

The multiplexed packet data S16 sequentially taken out from the hard disk 16 is transmitted to the transmitting circuit 2
1 and the wireless line WL to transfer to the server.

On the server side, based on the time information embedded in the packet data, the subsequently transmitted packet data is aligned so as to be temporally continuous with the previously transmitted packet data, and the data is stored. Stored in the department.

The time information for data alignment includes:
For example, a PCR (Program Clock Reference) of an MPEG2 transport stream packet is used.

Further, following shooting outside the service area, the multiplexed packet data S15 is stored in the hard disk 16
When the remaining capacity becomes zero, unexpected shooting interruption may occur.

In this embodiment, the hard disk 16
When the filling rate of the hard disk 16 exceeds a predetermined threshold value, a control signal from the system control circuit 31 is supplied to the remaining capacity alarm unit 32, for example, the red lamp is turned on or the buzzer sounds, and the hard disk 16 The user is warned that the remaining capacity is low.

Thus, the user can use the hard disk 1
It is possible to recognize that the remaining capacity of No. 6 is small, and to stop shooting before the remaining capacity of the hard disk 16 becomes zero, thereby avoiding an unexpected interruption of shooting.

As described above, in the embodiment of FIG. 2, a mobile terminal device including a continuous data generation unit such as a video camera is provided with a data storage hard disk and storage / transfer control means including a switch. When the mobile terminal is in the wireless communication service area, the mobile terminal device transmits continuous data to the other party, and temporarily stores required data that cannot be transmitted to the hard disk during the period when the mobile terminal apparatus is out of the wireless communication service area. In addition, when you move into the wireless communication service area, by transferring the stored required data to the other party,
A series of required data can be transferred to the destination without loss, near-immediately, for example, in a live broadcast where isochronism is required, without being aware of the area outside or within the area of the wireless communication service , A continuous data generator can be used.

Further, in the embodiment shown in FIG. 2, a remaining capacity alarm unit is provided to prevent a sudden interruption of shooting when the remaining capacity of the hard disk becomes zero.

[0058]

As described above, according to the present invention, when a data communication apparatus moves in and out of a radio communication service area, a series of required data can be transferred to a destination without any loss. In addition to this, it is possible to avoid a situation in which the device cannot be used suddenly when the period of time outside the service area is long.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a data communication device according to the present invention.

FIG. 2 is a block diagram showing a configuration of another embodiment of the present invention.

FIG. 3 is a block diagram for explaining the present invention.

[Explanation of symbols]

10, 10A: data processing system, 11: video camera, 1
2 video encoder, 13 microphone, 14 audio encoder, 15 multiplexer (multiplexer), 16 hard disk, 17, 18 changeover switch, 20, 20A communication system, 21 transmission circuit, 22
... Confirmation signal receiving section, 23 ... Antenna, 24 ... Service area outside / outside identification section, 30 ... Control system, 31 ... System control circuit (microcomputer), 32 ... Remaining capacity alarm section

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 5/781 H04N 5/781 510K 7/14 510C

Claims (1)

[Claims] 1. A data communication apparatus comprising: wireless communication means for communicating with a base station having a predetermined communicable range via a wireless line; and data generation means for generating continuous data to be supplied to the wireless communication means. , A data storage means for storing the continuous data, a communicable range identification means for identifying inside and outside of the communicable range, and data reading and data storage of the data storage means in response to the communicable range identification means. And a control means for switching between the data storage means and a remaining capacity alarm means for issuing an alarm when the remaining capacity of the data storage means is less than a predetermined value.