JP2005142961A - Data transmission system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a data transmission technology having an auxiliary function for enhancing certainty and reliability of wireless data transmission. <P>SOLUTION: When wireless data transmission fails due to some cause, e.g. movement of a device or variation in radio wave transmission situation, or jamming occurs during wireless transmission of broadcast data from the channel selecting section in a wireless center 3 to a display 5 (L-1), the display 5 notifies a portable telephone 10 to this effect by wireless communication technology. Upon receiving that signal, the portable telephone 10 receives broadcast data which have been received at the channel selector in a wireless center 3 until now, and transmits it to the display 5 (L-3). Even under such an environment as data transmission is disturbed between the channel selector in an SS wireless center 3 and the display 5, the portable telephone 10 under receivable state transmits the data to the display 5. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a data transmission auxiliary system, and in particular, performs data transmission between a channel selection unit (tuner unit) connected to a broadcast receiving antenna and a display unit (output device) connected to the channel selection unit by short-range radio. More particularly, the present invention relates to a data transmission auxiliary system using a portable device such as a portable information terminal.

  In recent years, information processing technology has dramatically improved, and a TV image display device (monitor device) that can reproduce data from a channel selection unit and storage device by wireless transmission technology and is easy to carry has appeared. For example, it is now possible to carry it anywhere in the house (see, for example, Non-Patent Document 1).

  In addition, with the rapid increase in data transmission speed and the increase in multimedia content centering on moving images, demand for receiving, playing and storing moving images with high image quality using mobile terminals has increased. In connection with this, in order to overcome the problem that the storage capacity of the memory provided in the portable information terminal, which is increasing in number of users, is relatively small, data transmission from the portable information terminal to the storage device can be considered. ing. For example, a system is disclosed that includes an information communication device such as a portable information terminal or a mail terminal, and a data storage device that is connected to these information communication devices by short-range wireless communication and stores data received by the information communication device. (For example, refer to Patent Document 1).

Product catalog (Sharp Corporation, LCD color TV LC-15L1), created in April 2003 JP 2002-183054 A

  At present, infrared communication or SS communication using 2.4 GHz described in Non-Patent Document 1 is used as a wireless transmission means to a home television. One of the problems in that case is a problem regarding the change and limit of the receivable range due to a change in the home use environment. There is a high possibility that the receivable range is narrowed mainly due to the presence of interference factors in the transmission and reception of radio waves, which is essential for the structure of houses. However, even the above-mentioned Patent Document 1 does not disclose a countermeasure regarding such a communication disturbance factor.

  An object of the present invention is to provide a data transmission technique having an auxiliary function for improving the certainty and reliability of wireless data transmission. It is another object of the present invention to provide various new data transmission techniques that occur with an increase in scenes where digital broadcasting is received by a portable terminal.

  The channel selection unit (storage device) connected to the broadcast receiving antenna or the display device (control device) connected to the portable information terminal by short-range wireless communication is selected according to the communication state with the channel selection unit (storage device). It is determined whether to connect to a local part (storage device) or to connect to a channel selection part via another device such as a portable information terminal, and to select a route.

  According to an aspect of the present invention, a first device including a first wireless communication unit, a second device including a second wireless communication unit, a third wireless communication unit, and the first wireless A portable device having data transmission assistance means for assisting data transmission between the first device and the second device in accordance with a communication status between the communication device and the second wireless communication device; A data transmission system is provided.

  Also, a broadcast data receiving device comprising first wireless communication means, a data receiving device comprising second wireless communication means for receiving data from the broadcast data receiving device, third wireless communication means, and the first A data transmission auxiliary means for assisting in data transmission between the broadcast data transmitting apparatus and the data receiving apparatus in accordance with a communication status between the first wireless communication means and the second wireless communication means. A data transmission system having a device is provided.

  According to the data transmission system, the portable device can assist data transmission between the first device and the second device in accordance with the data transmission status between the first device and the second device. Therefore, data transmission can be performed smoothly regardless of the data transmission status.

  Furthermore, by causing the display unit provided in the portable device to perform display based on the transmitted broadcast data, it is possible to monitor the original display status based on the data.

Furthermore, provided in the portable device or the portable information terminal,
A battery that supplies power to the portable device or the portable information terminal, a battery remaining capacity monitoring unit that monitors the remaining capacity of the battery, and a remaining capacity of the battery that is monitored by the battery remaining capacity monitoring unit is less than a certain value The second wireless communication unit performs control to switch the communication path between the first wireless communication unit and the second wireless communication unit to direct communication for communication via the third wireless communication unit. It is preferable to provide a communication path switching means. By changing the communication path when the battery capacity becomes below a certain level, it is possible to prevent the transmission path from being switched when the mobile phone runs out of battery, for example.

  According to the present invention, it is possible to perform data processing accompanied by transmission such as reproduction and recording of transmission data in various situations such as a position or situation where it is difficult to make a wireless connection between an indoor antenna, a wireless station, and the like. . In addition, economical and efficient data storage can be realized by automatically selecting a storage path.

  Hereinafter, a data transmission technique having an auxiliary function according to the first embodiment of the present invention (hereinafter collectively referred to as “data transmission system (technology)”) will be described with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of a data transmission system according to the present embodiment. 2 and 3 are an external view (FIGS. 2A and 2B) and a functional block diagram (FIG. 3) showing a schematic configuration of the mobile phone included in the data transmission system shown in FIG. 4 to 6, a channel selection unit (hereinafter referred to as “tuner unit”) as an example of information equipment included in the data transmission system illustrated in FIG. 1 and a television image display device (hereinafter referred to as “monitor device”). 2 is a functional block diagram showing a configuration of a television receiving / reproducing system including

  As shown in FIG. 1, the data transmission system A according to the present embodiment is roughly divided into a television reception / playback system 1 and a mobile terminal (mobile phone) 10.

  2A and 2B are views showing the appearance of the portable terminal according to the present embodiment. FIG. 2A is a rear view and FIG. 2B is a front view. FIG. 3 is a functional block diagram of the mobile phone.

  As shown in FIGS. 2A and 2B, the mobile phone 10 according to the present embodiment is an antenna for wireless communication between a main body 10a and other devices attached to the main body 10a so as to be stretchable. 111, a loudspeaker speaker 114 for notifying reception notifications, an LCD display unit 115 for displaying information such as reception information, images and text information, and a power key for turning on / off the power and receiving an incoming call Telephone function keys 117 and 118 for making calls, switching telephone functions, determining operations, etc., a mode (F) switching key 119 for switching various functions, and a cursor key 120 for moving a selection target in the vertical and horizontal directions, A dial key 122 for dialing a telephone number, a voice output unit 123 for outputting call voice, and a microphone 124 for inputting voice It is equipped with a.

  Furthermore, it has a camera 112 built in the back surface of the main body 10a, a small light 113 that emits light by a user operation or the like in a dark place, and a shutter key 121 that is a shutter button for determining input of the camera 112. Alternatively, a memory card slot (not shown) or the like into which a memory card for assisting the shortage of the built-in memory capacity may be provided.

  As shown in FIG. 3, the mobile phone 10 according to the present embodiment includes a CPU (control unit) 231 that controls the entire apparatus, a ROM that stores control programs, fixed data, and the like, and a RAM that is a working storage area of the CPU. A storage memory 232 that stores received or input character information, image information, and audio signals, a display unit 115 that displays character information and image information to the user, and key operations from the user A key input unit 122 that receives and receives radio waves, an antenna 111 that transmits and receives radio waves, a wireless unit 238 that controls transmission and reception of wireless communications, a speaker 114 that outputs audio signals, a microphone 124 that inputs audio signals from a user, and a battery 125. Battery remaining capacity monitoring unit 126 and communication path (transmission path) switching means 127 (installed in control unit 231). Configured with a shown) example being. Furthermore, a camera 112 that inputs target image information and a light 113 that emits light by a user operation at the time of imaging or the like may be provided. The mobile phone 10 may use a transmission method including an infrared port and Bluetooth.

  The control unit 231 controls the mobile phone 10 as a whole, receives video and audio data of, for example, television broadcasts transmitted by wireless communication, performs signal processing of the received video and audio data, and performs other processing on the processed data. It has a function to send to other devices such as display devices. Further, a process of switching a wireless communication target to itself (mobile phone) or another device according to a wireless transmission state between devices (when detecting a transmission state or according to a command from the device) or according to a user input operation I do.

  Next, the configuration of a television reception / playback system including a tuner unit as an example of information equipment included in the data transmission system illustrated in FIG. 1 and a monitor device will be described with reference to FIGS.

  FIG. 4 is a diagram showing a configuration example of the television reception / playback system according to the present embodiment. FIG. 5 is a functional block diagram showing a configuration example of a tuner side (wireless center side) device in the television reception / playback system according to the present embodiment. FIG. 6 is a functional block diagram showing a configuration example of a monitor side (TV side) device in the television reception / playback system according to the present embodiment.

  As shown in FIG. 4, the television reception / playback system 1 according to the present embodiment includes a tuner-side wireless center 3 having a tuner, and a TV 5 with a liquid crystal monitor with a built-in battery, for example. Further, the wireless center 3 includes a video 1 input (with S terminal) terminal 7a, a video 2 input (decoder input) terminal 7b, a video 3 input (monitor / BS output) terminal 7c, an AC power supply terminal 11a and a Car- It has a DC terminal 11b, a BS antenna 15a, a UHF / VHF antenna 15b, and a diversity antenna 15c. On the other hand, the TV 5 with a liquid crystal monitor has a video 4 input (TV output) terminal 21, an AC power supply terminal 23a, and a Car-DC terminal 23b.

  The wireless center 3 and the TV 5 with a liquid crystal monitor are associated with each other by, for example, SS radio based on the IEEE802.11b standard. MPEG2 stream information corresponding to TV broadcasting is sent from the wireless center 3 to the TV 5 with a liquid crystal monitor by SS radio, and other command data and the like are transmitted by bidirectional communication between the wireless center 3 and the TV 5 with a liquid crystal monitor. The

  Next, a detailed configuration example of the tuner side (wireless center side) device will be described with reference to FIG. Note that the description of the components already described in FIG. 4 is omitted. As shown in FIG. 5, the wireless center 3 includes a wireless center microcomputer 41 that controls the whole, a first AV selector 43, and a wireless transmission unit 45. Video inputs 1 to 3 (external inputs) 7 a to 7 c are associated with the AV selector 43.

  Further, the wireless center 3 includes a BS tuner 33 connected to the BS antenna 15a and a U / V tuner 31 connected to the UHF / VHF antenna 15b, and a first storage unit (EEPROM) 47, The associated wireless center microcomputer 41 performs channel selection processing based on the channel selection command 31a. The signal after the channel selection process 31a is input to the video / audio demodulator 35 and demodulated, and the audio switching unit 37 performs the audio switching process based on the audio switching command 37a from the wireless center microcomputer 41. . The video signal and the audio signal after the audio switching process are input to the first AV selector 43. Here, source selection processing is performed based on the voice switching command 43 a from the wireless center microcomputer 41, and the signal is input to the spread spectrum (SS) transmission unit 45.

  The spread spectrum (SS) transmission unit 45 includes an A / D converter 51, an MPEG2 encoder 53, a first SS radio transmission engine 55, and a first SS-CPU 57 that controls them. The video / audio signal on which the source selection processing 43a has been performed is A / D converted by the A / D converter 51, encoded to the MPEG2 format by the MPEG2 encoder 53, for example, and transmitted to the TV command transmission / reception command 57a from the wireless center microcomputer 41. Based on this, data encoded in the MPEG2 format is sent to the TV 5 with a liquid crystal monitor with a built-in battery, for example, and various commands (data) are bidirectionally communicated with the TV 5 with a liquid crystal monitor with a built-in battery.

  As shown in FIG. 6, the TV 5 with a liquid crystal monitor includes a TV microcomputer 65, an SS receiving unit 61, a second AV selector 67, and a TV monitor (liquid crystal display) 71 associated with a second storage unit (EEPROM) 73. And a remote control light receiving unit 75 that receives an input from the remote control device (FIG. 7). The SS reception unit 61 includes a second SS radio reception engine 77, an MPEG2 decoder 81, a D / A converter 83, and a second SS-CPU 85 for controlling them. Furthermore, the TV 5 with a liquid crystal monitor corresponds to battery driving, and has a battery 87b and a battery charger microcomputer 87a accordingly.

  The streaming information sent from the wireless center 3 side and encoded in the MPEG2 format is sent to the second SS radio transmission / reception engine in the SS reception unit 61 in accordance with an instruction from the SS-CPU 85 that has received the TV transmission / reception command 85a from the TV microcomputer 65. Is decoded by the MPEG2 decoder 81 and D / A converted by the D / A converter 83. The D / A converted streaming information is sent to the second AV selector 67, and the source selection command 67a from the TV microcomputer 65 determines which of the external input signals from the external input (4) 21 is selected. For example, after arbitrary OSD processing is performed based on an OSD output command from the TV microcomputer, the image is sent to the liquid crystal monitor 71 and displayed on the liquid crystal monitor 71 based on video / audio streaming information.

  In the television reception / playback system, as shown in FIG. 1, when broadcast data is transmitted from the channel selection unit of the wireless center 3 to the display device 5 by wireless data transmission (L-1), the movement of the device, When wireless data transmission becomes defective due to some cause such as a change in radio wave transmission status or when radio wave interference occurs, the display device 5 sends a signal for informing the mobile phone 10 to that effect by radio communication technology. (L-2). By receiving this signal, the mobile phone 10 receives the broadcast data that has been received by the channel selection unit of the wireless center 3 until now and transmits it to the display device 5 (L-3). Thereby, even in an environment where data transmission between the channel selection unit of the wireless center 3 and the display device 5 such as SS radio is interrupted, the mobile phone 10 in a receivable state transmits data to the display device 5. Thus, the display device 5 can receive and display broadcast data as before. When a sufficient image cannot be obtained even with the mobile phone, an operation of changing the position of the mobile phone 10 that is more portable than the wireless center 3 can be performed.

  In addition, although the case where the data transmission by radio | wireless becomes bad or the case where radio interference has arisen was demonstrated to the mobile telephone 10 from the display apparatus 5, the channel selection part of the wireless center 3 told the mobile telephone 10 to that effect. You may make it tell. The mobile phone 10 may also serve as a remote control device for the television reception / playback system. Further, an image reflecting the display of the display device 5 may be displayed on the display screen 115 of the mobile phone 10.

  Further, when wireless data transmission of broadcast data from the channel selection unit of the wireless center 3 to the display device 5 becomes possible, the data can be transmitted again through the route L-1. When only one of the audio data and the video data is not transmitted, only the data with the poor transmission may be received by the mobile phone, and the other may perform data transmission as before.

  Next, the outline of the flow of the above process will be described with reference to FIG. As shown in FIG. 7, processing is started in step S1, data is transmitted between the channel selection unit and the display device, and the transmitted data is displayed on the display device (step S2). Next, in step S3, it is monitored whether or not the data transmission state between the tuning unit and the display device is good. If the result is good, the process returns to step S2 to display the transmitted data on the display device. Continue. If the data transmission status between the channel selection unit and the display device is not good, the process proceeds to step S4 to notify the mobile phone of the data transmission status failure. Next, the process proceeds to step S5, and the data transmission source to the display device is switched from the tuning unit to the mobile phone. In step S6, the data is displayed on the display device by transmitting the data between the mobile phone and the display device. At this time, it is also possible to confirm whether or not the display is normally performed by performing a display corresponding to the display on the display device on the LCD display unit of the mobile phone.

  Next, in step S7, the data transmission status between the channel selection unit and the display device is confirmed, and it is determined whether or not the data transmission status has been recovered. If the data transmission status has been recovered, the data transmission path is returned to the start time in step S8, and the process returns to step S2. If the data transmission status has not recovered, the process returns to step S6, and data transmission is continued between the mobile phone and the display device. Through the above processing, display based on good data transmission can be performed on the display device.

  When the battery remaining capacity in the mobile phone is detected by the battery remaining capacity monitoring unit to be below a certain value, the communication path (transmission path) switching means 127 displays the communication path (transmission path) as a display device. An attempt is made to perform control so as to switch to direct communication between the radio and the tuning unit. As a result, before the battery of the mobile phone is completely exhausted, communication can be ensured by setting the transmission path between the display device and the channel selection unit.

  Next, a data transmission system having a data transmission auxiliary function according to a modification of the present embodiment will be described with reference to FIG. The system according to this modification basically has the same configuration as the system according to the first embodiment of the present invention, but the mobile phone 10 is provided between the channel selection unit of the wireless center 3 and the display device 5. Is different in that it is interposed. That is, when the wireless transmission state (L-11) between the tuning unit of the wireless center 3 and the display device 5 deteriorates, by interposing the mobile phone 10 in the middle (L-12, L-13), It functions as if it were a relay station. Thereby, compared with the case where a relay station does not exist, the wireless transmission state between the channel selection part of the wireless center 3 and the display apparatus 5 can be improved.

  As described above, according to the data transmission system provided with the data transmission auxiliary function according to the present embodiment, when the radio wave transmission state between the transmission side and the reception side deteriorates during data reception. In addition, the situation of wireless transmission can be improved supplementarily by a mobile phone. Further, since it is easy to change the position of the mobile phone, it is possible to search for an appropriate relay location by looking at the monitor image displayed on the display unit of the mobile phone while moving the mobile phone. Also in this case, control for switching the transmission path may be performed in accordance with the remaining battery level of the mobile phone.

  Next, a data transmission system according to a second embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 9 and 10, the process starts in step S11, and data is transmitted from the mobile phone 10 to the storage device (channel selection unit) 3a via the display device 5 (L-21, L-22). The transmitted data is stored in the storage device 3a (step S12). Next, in step S13, it is monitored whether or not the data transmission state between the storage device 3a and the display device 5 is good. If the result is good, the process returns to step S12 to display the data display device 5 being transmitted. Continue to display. If the data transmission status between the storage device 3a and the display device 5 is not good, the process proceeds to step S14, and the mobile phone 10 is notified of the data transmission status failure. In step S15, the data transmission to the storage device 3a is switched to the direct transmission (L-23) from the mobile phone 10. In step S16, data can be stored in the storage device 3a by transmitting data between the mobile phone 10 and the storage device 3a. At this time, it is also possible to check whether data is normally stored in the storage device 3a by displaying a data display corresponding to the stored data in the storage device 3a on the LCD display unit of the mobile phone 10. is there.

  Next, in step S17, the data transmission status between the display unit 5 and the storage device 3a is confirmed, and it is determined whether or not the data transmission status has been recovered. If the data transmission status is recovered, the data transmission path is returned to the start time in step S18, and the process returns to step S12. If the data transmission status has not recovered, the process returns to step S16, and data transmission is continued between the mobile phone 10 and the storage device 3a. With the above processing, it is possible to cause the storage device 3a to perform storage based on good data transmission. In this case, control for switching the transmission path may be performed according to the remaining battery level of the mobile phone.

  The data transmission system having an auxiliary function according to the present invention is mainly used for data transmission between wireless communication devices, but may include other devices connected in a wired manner. The present invention can also be applied to wireless AV devices that are out of communication range or that are connected in an emergency.

It is a block diagram which shows schematic structure of the data transmission system by the 1st Embodiment of this invention. FIG. 2 is an external view (FIGS. 2A and 2B) showing a schematic configuration of a mobile phone included in the data transmission system shown in FIG. FIG. 2 is a functional block diagram of a mobile phone included in the data transmission system shown in FIG. 1. FIG. 2 is a functional block diagram illustrating a configuration of a channel selection unit (hereinafter referred to as a “tuner unit”) illustrated as an example of an information device included in the data transmission system illustrated in FIG. 1. FIG. 5 is a functional block diagram illustrating a configuration of a channel selection unit included in the television reception / playback system illustrated in FIG. 4. It is a functional block diagram which shows the structure of the television image display apparatus shown as an example of the information equipment contained in the data transmission system shown in FIG. It is a flowchart figure which shows the flow of a process in the data transmission system by the 1st Embodiment of this invention. It is a block diagram which shows schematic structure of the data transmission system by the modification of the 1st Embodiment of this invention. It is a block diagram which shows schematic structure of the data transmission system by the 2nd Embodiment of this invention. It is a flowchart figure which shows the flow of a process in the data transmission system by the 2nd Embodiment of this invention.

Explanation of symbols

  A ... Data transmission system, 1 ... TV reception / playback system, 3 ... Wireless center on tuner side, 5 ... TV with liquid crystal monitor, 10 ... Mobile terminal (mobile phone), 45 ... Spread spectrum (SS) transmission unit, 61 ... SS receiving unit, 112 ... camera, 115 ... LCD display unit, 117, 118 ... telephone function key, 125 ... battery, 126 ... remaining battery capacity monitoring unit, 127 ... communication path (transmission path) switching means.

Claims (14)

A first device comprising first wireless communication means;
A second device comprising second wireless communication means;
Data transmission assistance between the first device and the second device according to the communication status between the third wireless communication device and the first wireless communication device and the second wireless communication device A data transmission system comprising a data transmission auxiliary means for performing a portable device. A first device comprising first wireless communication means;
A second device comprising second wireless communication means;
Data transmission assistance between the first device and the second device according to the communication status between the third wireless communication device and the first wireless communication device and the second wireless communication device A data transmission system comprising: a data transmission auxiliary means for performing a portable information terminal. A broadcast data receiving device comprising first wireless communication means;
A data receiving device comprising second wireless communication means for receiving data from the broadcast data receiving device;
Data transmission assistance between the broadcast data transmitting device and the data receiving device according to the communication status between the third wireless communication device and the first wireless communication device and the second wireless communication device. A data transmission system comprising a portable device having data transmission auxiliary means for performing.   4. The data transmission system according to claim 3, wherein the broadcast data receiving device includes a display unit that performs display based on the transmitted broadcast data.   The data transmission system according to claim 3, wherein the data receiving device includes a storage unit that stores received transmission data in a medium.   The data transmission system according to claim 4 or 5, wherein the portable information terminal includes a monitor display unit capable of displaying data corresponding to data transmitted to the display unit or the storage unit.   The wireless communication status monitoring unit for monitoring a wireless communication status between the first wireless communication unit and the second wireless communication unit, further comprising: The data transmission system described in 1.   Further, based on the monitoring result of the wireless communication status monitoring unit, the data transmission source to the first device or the second device is changed from the second device or the first device to the portable device or portable information. The data transmission system according to any one of claims 1 to 7, further comprising first communication path switching means for switching to a terminal. Furthermore, provided in the portable device or the portable information terminal,
A battery for supplying power to the portable device or the portable information terminal;
A battery remaining capacity monitoring unit for monitoring the remaining capacity of the battery;
When the remaining capacity of the battery monitored by the remaining battery capacity monitoring unit falls below a certain value, communication via the third wireless communication means is performed with the first wireless communication means and the second wireless communication means. 9. The data transmission system according to claim 1, further comprising: a second communication path switching unit that performs control for switching a communication path with the communication unit to direct communication. Further, provided in at least one of the first device and the second device,
A battery for supplying power to the first device or the second device;
A battery remaining capacity monitoring unit for monitoring the remaining capacity of the battery;
When the remaining battery capacity monitored by the remaining battery capacity monitoring unit falls below a certain value, a communication path between the first wireless communication unit and the second wireless communication unit is set to the first wireless communication unit. 9. The data transmission system according to claim 1, further comprising third communication path switching means for performing control to switch to a communication path via three wireless communication means. A portable device having a data transmission auxiliary function between a first device comprising a first wireless communication means and a second device comprising a second wireless communication means,
A data transmission side of the first device and the second device according to a communication state between a third wireless communication unit, and the first wireless communication unit and the second wireless communication unit A portable device having data transmission auxiliary means for transmitting data by a device on the data receiving side instead of the device. A portable device having a data transmission auxiliary function between a first device comprising a first wireless communication means and a second device comprising a second wireless communication means,
A third wireless communication means;
The second device or the second device from the portable device via the first device or the second device according to the communication status between the first wireless communication device and the second wireless communication device. A mobile device having a fourth communication path switching means for switching to direct transmission to the second device or the first device instead of data transmission to one device. Furthermore, provided in the portable device,
A battery for supplying power to the portable device;
A battery remaining capacity monitoring unit for monitoring the remaining capacity of the battery;
When the remaining capacity of the battery monitored by the remaining battery capacity monitoring unit falls below a certain value, communication via the third wireless communication means is performed with the first wireless communication means and the second wireless communication means. The mobile device according to claim 11, further comprising a fifth communication path switching unit that performs control for switching a communication path between the communication unit and the communication unit to direct communication.   A first device comprising a first wireless communication means and associated with a second device comprising a second wireless communication means, wherein the third wireless communication means, the first wireless communication means, and the first wireless communication means And a portable device having a data transmission auxiliary means for assisting data transmission between the first device and the second device according to the communication status between the two wireless communication means. Equipment.

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