JP2002199452A - Communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication system that attains high-speed communication by preventing interference between a mobile communication unit and other communication unit, without making the system become complicated. SOLUTION: In the communication system, that includes a base station 21, a mobile phone 30 and neighboring communication units 31, the code division multiple access system is adopted for communication between the base station 21 and the mobile phone 30 and communication between the mobile phone 30 and the neighboring communication units 31. Furthermore, the mobile phone 30 obtains an orthogonal code from the base station 21. A CDMA transmission section 39 can change the strength of communication and decides on the transmission strength for the base station 21. At communication between the mobile phone 30 and the neighboring communication units 31, the same orthogonal code as that used for the transmission to the base station 21 is used, and the communication is conducted at a strength level weaker than that of the transmission to the base station 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a communication system, and more particularly, to a communication system for performing communication between a base station, a portable telephone, and a storage device.

[0002]

2. Description of the Related Art A cell of a base station of a conventional mobile telephone is configured as shown in FIG.

That is, in FIG. 12, cells 1a ₁ to 1a ₁ to ₁
Base stations 2a _{1 to} 2a each having 1a _{7
The line 7} is connected to the mobile communication control station 3a. The mobile communication control station 3a is connected to another mobile communication control station, for example, 3b, via the high-speed line 4. And
This mobile communication control terminal 3b, the line is adapted to be connected to the cell 1b ₁ ~1b ₇ via the base station 2b ₁ ~2b _7.

[0004] For example, Japanese Patent Application Laid-Open No. 9-84138 discloses that a first fixed communication device communicates by a code division multiplex system, and a second fixed communication device communicates with a spread factor of spread spectrum. A communication technique for transmitting a code division multiplexing system in a burst manner by reducing the number of bits has been disclosed.

According to such a communication system, a mobile communication device (mobile phone) of a wide area communication system can be used as a slave unit of a closed area communication system. In addition, when there is a possibility of interference with a transmission / reception signal from another system, a method of avoiding the interference is described.

[0006]

However, in the technique described in Japanese Patent Application Laid-Open No. 9-84138, the channel separation is not performed by the orthogonal code. there's a possibility that. Although the method of avoiding interference is described, communication is performed each time while checking whether there is interference on the line, and when interference is likely to occur, processing to avoid interference is performed, and the system is complicated. It has become.

The present invention has been made in view of the above problems, and provides a communication system capable of high-speed communication by preventing interference between a mobile communication device and another communication device without complicating the system. The purpose is to do.

[0008]

That is, the present invention relates to a communication system including a base station, a mobile communication device, and a storage device. The storage device performs code division multiplexing communication, the mobile communication device obtains orthogonal codes from the base station, a transmission unit capable of changing communication strength,
Means for determining the transmission intensity to the base station,
At the time of communication between the mobile communication device and the storage device, using the same orthogonal code used for transmission to the base station,
In addition, communication is performed with a lower strength than transmission to the base station.

According to the present invention, in a communication system including a base station, a mobile communication device, and a storage device, communication between the base station and the mobile communication device, and between the mobile communication device and the storage device Communication between the devices is performed by a code division multiplex system. Further, the mobile communication device obtains an orthogonal code from the base station. The communication strength can be changed by the transmitting means, and the transmission strength to the base station is determined. Then, at the time of communication between the mobile communication device and the storage device,
The same orthogonal code as that used for transmission to the base station is used, and communication is performed with a lower strength than transmission to the base station.

According to this communication system, the orthogonal code provided between the base station and the base station is also used for communication with a communication device near the mobile communication device, so that interference with other communication devices is prevented. Can be prevented. Further, the communication intensity of the communication at that time is set to be very weak as compared with the transmission from the mobile communication device to the base station, so that the communication does not reach the base station, thereby preventing reception errors at the base station. .

[0011] Furthermore, by using a large number of PN codes obtained by shifting the phase of the PN code for transmission from the mobile communication device to the base station, data can be transmitted simultaneously in time, so that very high-speed communication can be performed. Becomes possible.

In addition, even if the data has a very large amount of data, such as image data of a digital camera (video camera) connected to the mobile communication device, this method can easily store the data in a storage device near the mobile communication device. It becomes possible to send.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

First, spread spectrum communication (Code Division Multiple A) applied to the communication system of the present invention.
ccess; hereinafter, referred to as CDMA).

FIG. 2 is a diagram showing the concept of CDMA.

As a feature of CDMA, a multiplication operation is performed by an orthogonal code which is about 100 times faster than an information signal, and the result is spread spectrum. Channels are separated by changing orthogonal codes for each user.

First, on the transmission side, the information data input by the primary modulation section 11 is digitized and provided with a carrier wave, and sent to the secondary modulation section 12 as a narrow band signal. Here, the signal spread over a wide frequency band by the spreading (PN) code is amplified by the power amplifier 13 and then transmitted to the antenna 1.
4 is output.

On the other hand, on the receiving side, the signal received by the antenna 16 is input to the correlation detector 18 via the front end 17, where it is despread by the despreading code. Then, the despread signal is sent to the primary demodulation unit 19, where the demodulated data is obtained.

As described above, the signal is spread to a wide frequency band at the time of transmission to become a weak signal, but is returned to a strong signal by being despread at the receiving side. Furthermore, even if narrow-band noise (interference signal) enters at the time of reception, it is spread by despreading at the time of reception and becomes a weak signal.
This communication is stronger than other communication methods, for example, the time division multiplexing method.

FIG. 3 is a diagram showing a network configuration of the communication system of the present invention.

That is, in FIG. 3, the base station 21 has a cell 22. The cell 22 has a plurality of personal cells 25 dedicated to individuals (only one is shown in FIG. 3), and is connected to a high-speed line 24 via a mobile communication control station 23.

The personal cell 25 is configured to correspond to a personal mobile phone 30 as a mobile communication device and a communication device 31 (for example, a memory) near the mobile phone 30. Accordingly, the line of the mobile phone 30 in the personal cell 25 is connected from the base station 21 to the high-speed line 24 via the mobile communication control station 23, and further connected to the high-speed line 24 from a mobile communication control station (not shown). The mobile phone is connected to another mobile phone or the like via a base station and a personal cell in another cell (not shown).

FIG. 1 is a block diagram showing a basic configuration of a communication system according to the first embodiment of the present invention.

A mobile phone as a mobile communication device generally uses a cell system, and the mobile phone is configured to communicate with a cell base station.

This system comprises a base station 21, a mobile phone 30, and a communication device 31 near the mobile phone 30.

The base station 21 includes a CDMA transmitting unit 34 and a CDMA receiving unit 35. A fixed line such as optical fiber communication is used between the base stations, and CDMA is used between the base station 21 and the mobile phone 30 and between the base station 21 and the communication device 31 near the mobile phone 30.

Further, the transmission direction from the mobile phone 30 to the base station 21 and the transmission from the base station 21 to the mobile phone 30 are different.
A different frequency band is used in the downlink direction, which is transmission to the mobile station.

The portable telephone 30 includes a first CDMA receiving section 37, a receiving strength detecting section 38 for detecting the signal strength of the first band, and a second CDMA receiving section 38 having a different frequency band from the first band. A CDMA transmitting unit 39 that outputs a band signal to a CDMA receiving unit 35 in the base station 21 and a CDMA receiving unit 43 in a nearby communication device 31 to be described later, and the intensity of a signal transmitted from the CDMA transmitting unit 39 A transmission strength selection unit 40 to be selected and a second CDMA reception unit 41 that receives a signal output from the CDMA transmission unit 47 in the nearby communication device 31 are configured.

Communication device 31 near portable telephone 30
Is a CDMA receiving unit 43 for receiving signals from the base station 31 and the mobile phone 30, a storage unit 44 for storing data of signals obtained by the CDMA receiving unit 43, and a communication device identifying unit 45 for identifying a communication device. A reception intensity detection unit 46 for detecting the intensity of a signal input to the CDMA reception unit 43; and a CDM for transmitting a signal to the mobile phone 30.
A transmission unit 47 and a communication device identification information storage unit 48 for storing identification information of the communication device.

Since the main purpose is to store the nearby communication device 31, it is usually constituted by a large-capacity high-speed storage device.

The first CDMA receiving unit 37 receives a signal of a first band at a predetermined frequency output from the CDMA transmitting unit 34 of the base station 21. Also, CDMA
The transmitting unit 39 is a CDMA receiving unit 35 in the base station 21.
In contrast, a second band having a frequency band different from the first band
And outputs a signal of a predetermined first intensity.

The CDMA transmitting section 39 outputs a signal having a second strength lower than the first strength in the second band to the CDMA receiving section 43 in the nearby communication apparatus 31. Further, the CDMA transmitting section 47 transmits the signal of the second strength in the second band to the second CDM in the mobile phone 30.
Output to the A receiving unit 41.

That is, the signal transmitted from the CDMA transmitting section 39 is obtained by shifting the orthogonal code input from the base station 21 in the second band. On the other hand, the communication device 3
The signal transmitted from the CDMA transmitting unit 47 to the mobile phone 30 in 0 is an orthogonal code obtained by further shifting the signal output to the CDMA receiving unit 43 in the second band. The orthogonal code is a spread code.

As described above, the orthogonal code is used for the mobile phone 30.
Is transmitted from the base station 21 to the mobile phone 30 when the base station 21 and the base station 21 communicate with each other. During communication, the orthogonal code is dedicated to the mobile phone in this cell, and the dedicated frequency band is used for the mobile phone 30, so it can be said that the channel is a very good channel.

In the CDMA system, the communication intensity is changed depending on the distance from the base station 21 and the degree of noise in order to keep the intensity at the base station 21 constant. For example, even during a call, when there is no sound, the transmission intensity is reduced to reduce the influence on other channels.

The communication device 31 in the vicinity is also the mobile phone 3.
A spreading code of 0 is obtained. There are the following two methods. One has a communication function similar to that of the mobile phone 30, and receives and obtains communication between the mobile phone 30 and the base station 21. The other is obtained by communication such as Bluetooth.

Since the mobile phone 30 and the nearby communication device 31 are close to each other, the communication strength can be made very weak. This can be said to be the same as a silent state when viewed from the base station 21 side.

As described above, the spreading code is an orthogonal code, and if synchronized, can be used as a plurality of spreading codes by shifting the phase. However, at the time of communication between the mobile phone 30 and the base station 21, synchronization cannot be established between the mobile phones, so that a mobile phone having a spread code shifted in phase cannot be assigned to a plurality of mobile phones. Conversely, the orthogonal codes assigned to the mobile phone, including the ones whose phases are shifted, are assigned to the mobile phone.

Similarly, since the orthogonal code is dedicated to a wide band of the CDMA, it is possible to perform a plurality of communications in a plurality of narrow bands.

On the other hand, the portable telephone 30 and the nearby communication device 3
During 1, communication is performed using the orthogonal code given from the base station 21. Mobile phone 30 and nearby communication device 3
It is easy to take synchronization between 1 and if the spreading factor by orthogonal code is 100 times, the phase is shifted by 100
By performing 100 simultaneous communication with 100 orthogonal codes,
100 times the communication with the base station 21 is possible.

Also, by narrowing the frequency band,
Communication several times more is possible.

Further, the portable telephone 30 and the nearby communication device 3
By dividing the communication with one into a plurality of bands, parallel communication is also possible. In addition, communication by time division may be performed.

FIG. 4A is a block diagram showing a configuration of a video input device, a portable telephone, and a storage device. The imaging device 32 in FIG. 1 corresponds to the video input device 70, and similarly, the nearby communication device 31 corresponds to the storage device 90.

In FIG. 4 (a), the portable telephone 30
A control circuit 51 for controlling the entire operation of the mobile phone 30
, A voice input / output circuit 52, a display circuit 53, a key group 54 including a plurality of keys, the base station 21 and the storage device 90.
Communication circuit 55 for performing communication with the camera, a USB circuit 56 for performing a USB connection with the video input device 70, a Bluetooth circuit 57, a built-in memory 58, a removable authentication card 59, a memory card 60, and a battery 61.

The image input device 70 includes a control circuit 71 for controlling the entire operation of the image input device 70, a CCD 72 for photographing, an analog signal processing circuit 73, an A / D
A converter 74, an MPEG circuit 75, and a JPEG circuit 76
And a USB circuit 77 for making a USB connection with the mobile phone 30, an IEEE-1394 circuit 78, a Bluetooth circuit 79, a built-in memory 80, a removable authentication card 81, a memory card 82 and a battery 83. It is composed.

Further, the storage device 90 includes a communication circuit 92 for performing communication between the control circuit 91 which controls the entire operation of the storage device 90 and the mobile phone 30, and a built-in memory 93.
, An MPEG circuit 94, a JPEG circuit 95, and a USB
A circuit 96, an IEEE-1394 circuit 97, a Bluetooth circuit 98, a removable authentication card 99, a large-capacity storage medium 100, and a battery 101 are provided.

The video input device 70 and the mobile phone 30 are directly connected by USB, and the mobile phone 3
0 and the storage device 90 perform CDMA communication. Note that the video input device 70 and the mobile phone 30 may be integrally configured without using USB.

The authentication cards 59, 81, 99
Must have the same data to identify the user.

FIG. 4B shows such a video input device 70.
FIG. 2 is a diagram showing an example of a state where a mobile phone and a mobile phone 30 are connected. Incidentally, reference numeral 84 in the figure denotes a photographing lens provided in the video input device 70.

FIG. 5 is a block diagram showing a circuit configuration of the CDMA mobile phone 30. As shown in FIG.

The portable telephone 30 is configured to perform transmission and reception with one antenna using a transmission / reception branching filter.

First, the receiving side will be described. A signal received by the antenna 105 is split by a band-pass filter (BPF) 106 constituting a transmission / reception splitter.
Then, when amplified by the power amplifier 107, a broadband bandpass filter (BPF) is set so as to be in a CDMA band.
Through 108, despreading is performed in a despreading circuit 109 based on a PN code from a PN sequence generator 110.

Next, the despread signal passes through a narrow band-pass filter (BPF) 111,
The KE converter 112 is reached. Here, the RAKE converter 11
Numeral 2 is to increase the reception strength by receiving and combining multipath signals which have been reflected by an obstacle or the like and passed through a plurality of paths and have a time delay.

The signal whose reception intensity has been increased in this way is further converted into a digital signal by the PSK detector 113, error-corrected by the error correction unit 114, and stored in the reception data storage unit 115. The PSK detector 113,
From the output of the error correction unit 114, the S / N ratio detection unit 116
The S / N ratio and the error rate are detected by the error rate detection unit 117. Based on this detection result, power control is performed by the power control data unit 118. Then, the reception data storage unit 1
15 and the data obtained in the power control data unit 118 are:
It is supplied to the control unit 120.

A display unit 121 and a keyboard 122 are connected to the control unit 120, and a voice control unit 123
Through the microphone (microphone) 124 and the speaker 12
5 is connected.

On the transmission side, the transmission data stored in the transmission data storage unit 126 by the control unit 120 is added with an error correction code by the error correction coding unit 127. After that, in the spreading circuit 128, the PN code is spread by the PN sequence generator 129 by the PN code, and the PSK modulator 13 is spread.
At 0, it is converted to an analog waveform signal. Further, after this analog signal is power-amplified by the power amplifier 131, the antenna 1
05.

In the figure, reference numeral 132 denotes a battery for supplying power to the entire apparatus.

FIG. 6 is a block diagram showing a portion related to transmission from the portable telephone 30 to which the video input device 70 is attached to the storage device 90. here,
The following description focuses on data diffusion and despreading.

In the video input device 70, the video data captured by the CCD 72 is converted into a digital signal by an A / D converter 74, and then converted into a digital signal in the mobile phone 30 via a USB circuit (not shown). The data is supplied to the data storage circuit 135. Then, the data is divided into a plurality of data of data 1 to data n by the data dividing circuit 136.

Here, the plurality of data divided into data 1 to data n are respectively PN codes 137 ₁ , 137 ₂ , and 137 whose phases are shifted as shown in Table 1 below.
, 137 _n , the code spreaders 138 ₁ , 138 ₂ ,
PN spread by 138 _n .

Further, each data subjected to PN spreading is PSK
The modulators 139 ₁ , 139 ₂ ,... 139 _{n are} subjected to PSK modulation based on the output of the phase shifter 140 and converted into analog signals. After that, the analog signals are synthesized by the synthesizing unit 141 and transmitted from the antenna 105.

[0062]

[Table 1]

Here, Table 1 shows an example of the correlation between the phase shift of the PN code and the original PN code.
Here, it is represented by a 7-bit PN code for simplicity. When the phase shifts, the code correlation becomes 1/7.

On the storage device 90 side, the signal received by the antenna 145 is transmitted to the despreaders 146 ₁ , 146 ₂ ,.
Despread at 46 _n . That is, the PSK modulator 148
_1, 148 _2, ..., at 148 _n, the same PN code 149 ₁ and the transmission side by the output of the phase shifter 147, 149 _2,
.., 149 _n are phase shifted. The received signal is de-spreaded by the despreader 1 by the phase shifted PN code.
46 _1, 146 _2, ..., are despread at 146 _n.

Thereafter, a band pass filter (BPF) 1
50 _1, 150 _2, ..., through 150 _n, PSK detector 151 _1, 151 _2, ..., it is converted into a digital signal at 151 _n. Then, after error correction and data synthesis are performed by the data synthesis circuit 152, the data is compressed by the data compression circuit 153, and the data is further stored in the data storage circuit 154.

FIG. 7 is a block diagram showing another example of a portion related to transmission from the portable telephone 30 to which the video input device 70 is attached to the storage device 90.

The difference from the circuit of FIG. 6 is that the mobile phone 30 has a phase-shifted PN code 156 and a delay circuit 157.
_1, 157 _2, ..., after code spreading by 157 _n,
That is, the digital data is added as it is. Further, in the storage device 90 side, similarly, PN code 158 and a delay circuit 159 _1, 159 _2, ..., using a 159 _n,
That is, the signal is converted into an analog signal after the D / A conversion. Therefore, the same reference numerals are given to the other same parts, and the description is omitted.

As a result, the circuit shown in FIG.
The size of the analog circuit can be reduced as compared with.

Next, a communication procedure in this communication system will be described with reference to FIG.

First, the base station 21 is detected. That is, the base station 21 allows the mobile phone 30 in its own cell to
A general call is made periodically to find out the presence of. On the mobile phone 30 side, by this simultaneous call,
It checks which cell you are in. At this time, if it is found that the mobile phone 30 is moving between the base stations, the change of the base station 21 is notified. This allows
On the base station 21 side, the mobile phone 30 is registered.

The communication between the portable telephone 30 and the storage device 90 is performed according to the following procedure.

Here, first, in order to obtain the PN code from the base station 21, a communication request is made from the portable telephone 30 to the base station 21 at the first strength of the second band. In this case, since there is no need to connect to another, a telephone number specific to the mobile phone or a dedicated telephone number is specified. In this case, a telephone number dedicated to such a personal cell may be provided.

Next, from the base station 21 to the mobile phone 30
Then, the fact that the line is connected is notified by the first band. In this case, the PN code is transmitted, and the reservation of the PN code is also notified.

Then, a communication request is made from the portable telephone 30 to the storage device 90 which is a nearby communication device. This communication request is made at the second strength of the second band. Since the second strength is a second strength weaker than the first strength for performing communication with the base station 21 side, the mobile phone 30 performed here
Is received only on the storage device 90 side.
When a PN code is sent by Bluetooth or the like,
It will be sent at this time.

When a communication request is received from the mobile phone 30, the storage device 90 notifies that the line between the storage device 90 and the mobile phone 30 is connected by a signal of the second strength in the second band. You. In this way, a plurality of P-phase-shifted P
Communication is performed by multiplexing using N codes.

When the transmission and reception of information between the mobile phone 30 and the storage device 90 is completed, the mobile phone 30 transmits the information to the storage device 90.
Is requested to end the communication. Since this communication termination request is made at the second strength of the second band, the signal does not reach the base station 21 side and is received only by the storage device 90 side.

When a communication termination request is received from the mobile phone 30, a signal indicating the end of the line connection between the storage device 90 and the mobile phone 30 is transmitted from the storage device 90 by a signal of the second strength in the second band. Can be

When the storage device 90 notifies the end of the connection, the mobile phone 30 notifies the base station 21 of the communication end request at the first strength of the second band. Upon receiving the communication termination request, the base station 21 notifies the mobile phone 30 that the line has been disconnected using the first band.

Thus, the communication between the mobile phone 30 and the storage device 90 and the base station 21 ends.

In the above-described embodiment, since the amount of communication is large in the transmission direction (downlink) from the mobile phone 30 to the storage device 90 and small in the reverse direction (uplink), a plurality of phase-shifted PN codes are used. Are used for downstream and some are used for upstream.

Further, the band for transmission from the mobile phone 30 to the base station 21 may be divided into two bands and used for going up and down the mobile phone 30 and the storage device 90.

FIG. 9 is a block diagram showing another example of the configuration of the video input device, the mobile phone, and the storage device.

In FIG. 9, the video input device 70a and the mobile phone 30a are connected, and the video input device 70a directly performs CDMA communication with the storage device 90a.

That is, the mobile phone 30a is connected to the base station 2
1 and a USB communication circuit 56a for making a USB connection with the video input device 70.
And a control circuit 51, a voice input / output circuit 52, and a display circuit 5.
3, a key group 54, a Bluetooth circuit 57, a built-in memory 58, an authentication card 59, a memory card 60, and a battery 61.

The video input device 70a includes a USB circuit 77a for making a USB connection with the mobile phone 30, a communication circuit 85 for communicating with the storage device 90a, a control circuit 71, a CCD 72, and an analog signal processing circuit. 73, A
/ D converter 74, MPEG circuit 75, JPEG circuit 7
6, IEEE-1394 circuit 78, Bluetooth circuit 7
9, built-in memory 80, authentication card 81, memory card 8
2 and a battery 83.

Further, a storage device 9 as a nearby communication device
0a is a communication circuit 92a for performing communication with the video input device 70a, a control circuit 91, a built-in memory 93, M
PEG circuit 94, JPEG circuit 95, USB circuit 96,
IEEE-1394 circuit 97, Bluetooth circuit 98,
It comprises an authentication card 99, a mass storage medium 100 and a battery 101.

Since the display of the portable telephone 30a is small, the display data may be small.

Further, when the number of pixels of the image input device 70a is large or when the image is a video image, an extremely large amount of data is required. However, it is possible to transmit a huge amount of data by transmitting the code by spreading the code with several tens of PN codes shifted in phase. The video input device may perform data compression on the storage device side specifically for video input. Further, since data is sent directly from the video input device to the storage device, the mobile phone itself may have a normal communication speed.

Next, a second embodiment of the present invention will be described.

FIG. 10 is a diagram showing the concept of a capsule endoscope to which the communication system according to the present invention is applied.

In the second embodiment, a capsule endoscope having a built-in endoscope is used as a nearby communication device for communicating with a mobile phone.

In FIG. 10, a capsule endoscope 161 is prepared as a nearby communication device for communicating with the mobile phone 30 in addition to the storage device. This capsule endoscope 161
Is swallowed by the subject 162 and used.

FIG. 11 is a block diagram showing the configuration of such a capsule endoscope, a portable telephone, and a storage device.

In FIG. 11, the portable telephone 30b communicates with a control circuit 51, a voice input / output circuit 52, a display circuit 53, a key group 54, a base station and a capsule endoscope 161 and a storage device 90b. Mobile communication circuit 55b, USB
Circuit 56b, Bluetooth circuit 57, built-in memory 5
8. It has a removable authentication card 59, a memory card 60 and a battery 61.

The capsule endoscope 161 includes a control circuit 165 for controlling the entire capsule endoscope, an illumination light-emitting diode (LED) 166 for illuminating the stomach and intestine in the subject 162, and CCD 167, analog signal processing circuit 168, A / D converter 169, built-in memory 170, mobile phone 30b and storage device 9
0b and the communication circuit 171 for communicating with the battery 1
72.

Further, the storage device 90b includes a control circuit 91
A communication circuit 92b for communicating with the capsule endoscope 161 and the mobile phone 30b;
MPEG circuit 94, JPEG circuit 95, USB circuit 9
6, IEEE-1394 circuit 97, Bluetooth circuit 9
8. Removable authentication card 99, mass storage medium 1
00 and the battery 101.

The communication circuit 1 in the capsule endoscope 161
The communication circuit 92b in the storage device 71 and the storage device 90b is equivalent to the mobile communication circuit 55b in the mobile phone 30b.

In such a configuration, diagnosis using a capsule endoscope is performed as follows.

That is, first, the capsule endoscope 161 and the mobile phone 30b are brought close to each other so as to come into contact with each other. Then
With the mobile phone 30b in a talking state, a PN code (code 1) is sent from the base station.

Then, using the fixed PN code (code 2), the information of the code 1 is transmitted from the mobile phone 30b to the capsule endoscope 161 at a very weak output by, for example, communication of a specific frequency. Sent. At the same time, CC
Various information such as a time interval of image input by D167, start information, an end time, and an end count are also sent.

From the capsule endoscope 161,
, And the input image is sent to the storage device 90b in parallel.

When the subject 162 swallows the capsule endoscope 161 in this state, and is operated in accordance with an instruction from the mobile phone 30b, an image such as the stomach and intestine in the subject 162 is captured and transmitted to the storage device 90b. Can be

[0103] The capsule endoscope 161 captures an image in synchronization with the lighting of the illumination LED 166, and captures an image at regular intervals, for example. Alternatively, the user may view the image sent from the capsule endoscope 161 and perform intensive shooting.

With this configuration, the capsule endoscope 1
Other than 61, only the ordinary mobile phone 30b and the storage device 90 are used, so that the subject can perform endoscopic imaging at home. In this case, a video of which the photographed image is worrisome is attached to an e-mail and sent to the hospital to be diagnosed.

Note that the capsule endoscope 161 and the mobile phone 3
The transmission of the PN code between 0b may be performed by connection or contact other than communication. Furthermore, it is possible to transmit the information wirelessly even by a wire.

According to the above embodiment of the present invention, the following configuration can be obtained.

That is, (1) In a communication system including a base station, a mobile communication device, and a storage device, an image input device, an image output device, or an information input device is included. Or, the information input device has means for obtaining an orthogonal code from the base station, and when communicating with the image input device, the image output device, or the information input device and the storage device, the information input device is used for transmission to the base station. A communication system using the same orthogonal code to perform communication.

[0108]

As described above, according to the present invention, communication between a mobile phone and a communication device located near the mobile phone can be executed at high speed while preventing interference with other communication devices. . Further, by providing a separate storage unit, a mobile phone-connected digital camera (video) having a high pixel count can be easily realized.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a basic configuration of a communication system according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating the concept of CDMA.

FIG. 3 is a diagram showing a network configuration of a communication system according to the present invention.

4A is a block diagram illustrating a configuration of a video input device, a mobile phone, and a storage device, and FIG.
FIG. 2 is a diagram showing an example of a state in which a mobile phone 30 is connected to a mobile phone 30.

FIG. 5 is a block diagram showing a circuit configuration of the CDMA mobile phone 30;

FIG. 6 is a mobile phone 3 to which a video input device 70 is attached.
FIG. 2 is a block diagram illustrating a portion related to transmission from a storage device 0 to a storage device 90;

FIG. 7 is a mobile phone 3 to which a video input device 70 is attached.
FIG. 10 is a block diagram of another example in which a portion related to transmission from 0 to the storage device 90 is extracted and shown.

FIG. 8 is a diagram illustrating a communication procedure in the communication system according to the first embodiment.

FIG. 9 is a block diagram showing another configuration example of the video input device, the mobile phone, and the storage device.

FIG. 10 shows a second embodiment of the present invention.
FIG. 1 is a diagram illustrating a concept of a capsule endoscope to which a communication system is applied.

FIG. 11 is a block diagram illustrating a configuration of a capsule endoscope, a mobile phone, and a storage device according to a second embodiment.

FIG. 12 is a diagram showing a network configuration of a conventional communication system.

[Explanation of symbols]

 11 primary modulation section, 12 secondary modulation section, 13 power amplifier, 14, 16 antenna, 17 front end, 18 correlation detection section, 19 primary demodulation section, 21 base station, 22 cell, 23 mobile communication control station, 24 High-speed line, 25 personal cell, 30 mobile phone, 31 nearby communication device, 32 imaging device, 34 CDMA transmission unit, 35 CDMA reception unit, 37 first CDMA reception unit 37, 38 reception intensity detection unit, 39 CDMA transmission unit , 40 transmission intensity selection unit, 41 second CDMA reception unit, 43 CDMA reception unit, 44 storage unit, 45 communication device identification unit, 46 reception intensity detection unit, 47 CDMA transmission unit, 48 communication device identification information storage unit, 70 Video input device, 90 storage device.

Claims (4)

[Claims] In a communication system including a base station, a mobile communication device, and a storage device, code division multiplexing is performed between the base station and the mobile communication device and between the mobile communication device and the storage device. The mobile communication device comprising: means for obtaining orthogonal codes from the base station; transmission means capable of changing the communication strength; and means for determining the transmission strength to the base station. At the time of communication between the mobile communication device and the storage device, use the same orthogonal code used for transmission to the base station,
A communication system that performs communication with a lower strength than transmission to the base station. 2. The storage device according to claim 1, further comprising means for receiving communication between the mobile communication device and the base station and obtaining an orthogonal code for communication between the mobile communication device and the base station. Item 2. The communication system according to Item 1. 3. The communication system according to claim 1, wherein, when the mobile communication device communicates with the storage device, the orthogonal code is multiplexed with a plurality of data by a plurality of orthogonal codes shifted in phase. Communication system. 4. An image input means, further comprising: an image input means connected to the mobile communication device by wire, data input by the image input means being sent to the mobile communication device, and transmitting the data to the mobile communication device. The communication system according to claim 1, wherein the data is transmitted from a mobile communication device to the storage device.