JP3164085B2 - Wireless data communication method and system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a digital cellular mobile telephone system (PDC-TS: Personal Digital C).
Transmission of communication data by ellular Telecommunication System, or PDC-TS and digital cordless telephone system (simple telephone system-PHS: Personal H)
andyphone Systenm / DECT (Digital European Cord
The present invention relates to a wireless data communication method and system for selecting transmission of communication data according to both less telecommunication / CT-2-UK standard).

[0002]

2. Description of the Related Art Conventionally, as a mobile telephone / data communication system, a digital cellular mobile telephone system (PDC-
TS) and digital cordless telephone system (PHS / D)
ECT / CT-2, hereafter described only with PHS) is well known. The PDC-TS is a packet-based and low-speed data transmission, for example, a relatively low-speed data transmission of 9600 bps, and is a pay-per-use system depending on the amount of communication data. In addition, PHS is compatible with PIAFS (PHS Inter
High-speed data communication according to the Net Access Forum Standard) is possible. When a PHS terminal and a PIAFS-compatible terminal are used in combination, high-speed data transmission at a transmission speed of 28800 bps can be performed, for example. The PHS is a time charging system based on the length of time during which communication data is transmitted.

[0003] The PDC-TS and PHS having such characteristics are separate communication systems, and have separate specifications (standards). Therefore, dedicated telephone terminals are used for each. The PDC-TS has a frequency of 80, for example.
0 (1.5) MHz is used, the access method is 3 channels / TDMA, and the voice coding method is 11.2 kbp.
s-VSELP / 5.6 kbps / PSI-CELP. The modulation method is π / 4QPSK. PHS
Uses, for example, a frequency of 1900 MHz, the access method is TDMA / TDD, and the audio coding method is 32.
kbps-ADPCM. The modulation method is QPS
K. Therefore, in PDC-TS and PHS,
The data communication is performed using the respective separate telephone terminals and using the data terminals.

[0004] For this reason, an apparatus configuration in which the PDC-TS or PHS is switched and used (combined use) is conceivable. For example, in a conventional example of Japanese Patent Application Laid-Open No. H10-94038, "Interconnecting apparatus", mutual communication with communication terminals of a heterogeneous communication network including a PHS network is enabled. In this conventional example, for example, P
Although the DC-TS is capable of intercommunication with a heterogeneous communication network including a PHS network, it is not possible to switch one of the PDC-TS and the PHS based on its advantage to transmit communication data.

[0005] For example, the PDC-TS is a pay-as-you-go system based on the amount of communication data, and when the communication data is transmitted by always connecting the line, the economical advantage can be obtained, but the transmission speed is low ( For example, 9600 bps). Therefore, when the amount of communication data increases, it is economically disadvantageous. In PHS, high-speed data transmission (transmission speed 32 kbps, 32 kbps × 2 bps / 2
8800 kbps) is possible, but it is a time charging system based on the length of communication data transmission time, and long-time line connection, that is, long-time data communication is economically disadvantageous.

[0006]

In the above conventional example, data communication is performed by switching the PDC-TS or PHS based on the economic advantages of the pay-per-use system and the time-based system, and the advantage of the transmission speed. There was a disadvantage that it could not be performed.

[0007] The present invention solves such problems in the prior art, and transmits communication data only by a digital cellular mobile telephone system (PDC-TS) or a PDC-TS and a simple telephone system (PH).
S), the transmission of communication data can be selected based on the economic advantage of the pay-per-use system, the economic advantage of the time-based system, and the advantage of the transmission speed. It is an object of the present invention to provide a wireless data communication method and a system for enabling efficient data communication.

[0008]

In order to solve the above-mentioned problems, a wireless data communication method according to the present invention provides a first method based on a pay-per-use method .
A wireless communication network and a second wireless communication network connected to a charging system;
Data between the first data communication device and the second data communication device.
In the wireless data communication method for performing data communication, the first
Data communication device, via the first wireless communication network,
After the call is connected to the second data communication device, the communication data
Sending data to the second data communication device
And the second data communication device transmits the data of the communication data.
Data volume is measured and the data volume exceeds the specified value.
In the meantime, the second wireless communication network is connected while the call is connected.
A line connection with the first data communication device through
And the first data communication device performs the period
Communication data via at least the second wireless communication network.
Transmitting data to the second data communication device;
It is characterized by having.

The wireless data communication method according to the present invention includes
Client device and server connected to DC network and PHS network
Wireless data communication method for performing data communication with
In this case, the client device communicates via the PDC network.
After a call is connected to the server
Transmitting to the server device;
Device measures the data amount of the communication data,
During the period when the volume exceeds the predetermined value, the call is connected.
Between the client device and the PHS network.
Making a line connection with the client device
However, during the period, at least via the PHS network
Transmitting communication data to the server device.
It is characterized by

[0010] Further , the wireless data communication method according to the present invention is characterized in that:
Client device and server connected to DC network and PHS network
Wireless data communication method for performing data communication with
Wherein the server device is connected to the server via the PDC network.
After connecting the call with the client device, the communication data
Sending to the client device;
Client device measures the data amount of the communication data
During the period when the data amount exceeds a predetermined value, the call
Connected to the server device via the PHS network.
Establishing a line connection with the server device;
However, during the period, at least via the PHS network
Transmitting communication data to the client device
And characterized in that:

Further , the wireless data communication system of the present invention
Is a first wireless communication network with a pay-as-you-go system and a second wireless communication network with a billing system.
A first data communication device connected to a communication network and a second data communication device;
Wireless data communication system that performs data communication with
The system, wherein the first data communication device is the first data communication device.
Between the second data communication device through one wireless communication network
After the call is connected, the communication data is transferred to the second data communication.
Means for transmitting to the device, the second data communication device
Measures the data amount of the communication data, and
While the call exceeds the predetermined value, the call is connected.
And the first data communication via the second wireless communication network.
Means for making a line connection with a device, wherein the first data
The data communication device may further include at least the
The communication data is transmitted via the second wireless communication network to the second data.
Means for transmitting to the communication device.
You.

Also, the wireless data communication system of the present invention
Is a client device connected to the PDC network and PHS network
Data communication that performs data communication between the server and the server device
In the system, the client device includes the PD
After connecting a call with the server device via the C network,
Means for transmitting communication data to the server device,
The server device measures a data amount of the communication data,
During the period when the data amount exceeds a predetermined value, the call is connected.
Connected to the client via the PHS network.
Means for making a line connection with a device, wherein the client
The client device further includes at least the PH during the period.
Transmitting communication data to the server via the S network
It is characterized by comprising means.

Further , the wireless data communication system of the present invention
Is a client device connected to the PDC network and PHS network
Data communication that performs data communication between the server and the server device
In the system, the server device connects to the PDC network.
Connecting a call with the client device via
Means for transmitting communication data to the client device.
For example, the client device may store the communication data.
The period during which the data amount is measured and the data amount exceeds the specified value
Is connected via the PHS network in the state where the call is connected.
Means for making a line connection with the server device,
The server device may further include at least the P
Communication data to the client device via the HS network
It is characterized by comprising means for transmitting.

Further , the wireless data communication system of the present invention
Means that the client device communicates with the server device via the PDC network.
When connecting a call between the PHS
The telephone number assigned in the network is sent to the server
Notify, and conversely, the server device
When a call is connected to a client device, the server device
The client assigns the telephone number assigned in the HS network
It is characterized by notifying the device.

As a result, the transmission of communication data by the PDC-TS, or the transmission of communication data by both the PDC-TS and the PHS, is realized by the economical advantages of the pay-per-use system and the time-based system, and the advantages of the transmission speed. Based on this, it is possible to always connect the line between the end and the end.
Furthermore, efficient transmission of communication data becomes possible.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the wireless data communication method and system of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a wireless data communication method and system according to an embodiment of the present invention. In this wireless data communication system, a client 1 operating as a data processing terminal and communication data from the client 1 are transmitted by a PDC-TS, or communication data is divided and transmitted by both a PDC-TS and a PHS. And a PDC terminal 3 connected to the multiplexing device 2 through an interface (I / F).
And a PHS terminal 4 connected to the multiplexing device 2 as an interface (I / F), a PDC network 5 with packet communication and low-speed data transmission, for example, data transmission at a transmission speed of 9600 bps, and a pay-per-use system. .

This wireless data communication system has a P
High-speed data communication using the PIAFS standard with a cell base station 5a connected to the DC network 5 through an interface (I / F);
For example, along with high-speed data transmission at a transmission rate of 28,800 kbps, a PHS network 6 with a time charging system and this PHS network 6
Device 6a connected to the interface (I / F)
When the amount of communication data in the PDC-TS increases, the communication data transmitted by the PDC network 5 and the PHS network 6 are combined together with the control to further use the communication data transmission by the PHS. A multiplexing device 7 on the server side for sending out, and a server 8 as a fixed terminal for providing a program to the client 1 to collect processing data of the client 1 and for performing network management and the like are provided.

FIG. 2 is a block diagram showing a detailed configuration of the multiplexing device 2 on the client side. This multiplexing device 2
Is a call control unit 9 that performs call control on the PDC network 5 and the PHS network 6, and a division unit that processes division and synthesis of communication data.
Combination processing unit 10 and PDC packet processing unit 1 as a communication processing unit that processes packet communication in PDC-TS
1 and a PIAFS processing unit 12 as a transmission processing unit for executing the PIAFS data transmission protocol.

FIG. 3 is a block diagram showing a detailed configuration of the multiplexing device 7 on the server side. This multiplexing device 7 has a PD
Call control unit 1 that performs call control for C network 5 and PHS network 6
6, a communication processing unit 17 for processing packet communication with the PDC network 5, a PDC packet processing unit 17, a PIAFS processing unit 18 as a transmission processing unit for executing the PIAFS data transmission protocol, and processing for dividing and synthesizing communication data. Split·
The combining processing unit 19 and the server 8 determine an increase or decrease in the amount of communication data during communication, and instruct the call control unit 16 to add or delete a transmission band (add or stop transmission of communication data by PHS). A data amount measuring section 20 to be transmitted is provided.

The PDC terminal 3 and the PHS terminal 4 have a general configuration. As its configuration, a transmitting / receiving unit that performs transmission / reception at a specified frequency, a synthesizer that determines a transmission / reception frequency,
It includes a reception electric field strength detection section, a quadrature modulation / demodulation section, a time division multiplexing section (TDMA), an encoding / decoding (codec) section, microphones and speakers for transmission and reception, an input operation (keypad) section, and the like. I have. The PDC terminal 3 and the PHS terminal 4 are provided with slots and interfaces for transmitting communication data.

A cell base station 5a of the PDC network for making a wireless line (air (A) interface) connection with the PDC terminal 3;
The outdoor device 6a for making a wireless line (air (A) interface) connection with the PHS terminal 4 has a general-purpose configuration. As its configuration, it includes a wireless transmission / reception unit, a quadrature modulation / demodulation unit, a multiplexer, and the like. The cell base station 5a is accommodated in the PDC network 5 through a mobile communication control station (not shown).
The outdoor device 6a has the same configuration as that of the cell base station 5a, and is accommodated in the PHS network 6 via a not-shown general base station or the like or directly accommodated in the PHS network 6.

Next, the operation of this embodiment will be described. The call control unit 9 of the multiplexing device 2 on the client side shown in FIG. 2 and the call control unit 16 of the multiplexing device 7 on the server side shown in FIG. 3 perform transmission of communication data based on the amount of communication data. Transmission of communication data only by the PDC network 5,
Alternatively, control is performed to select transmission of communication data by both the PDC network 5 and the PHS network 6 (this control operation is appropriately described as an operation of the embodiment of the present invention).

Cell base station 5a at PDC terminal 3 and PD
The communication operation through the C network 5 is performed by a general PDC terminal (PD
C mobile phone) and the cell base station. The communication operation of the PHS terminal 4 through the outdoor device 6a and the PHS network 6 is the same as the operation of a general PHS terminal (PHS mobile phone) and the outdoor device.

For example, when the PHS terminal 4 moves to the cell of the outdoor device 6a, the broadcast channel (BC) is transmitted from the outdoor device 6a.
CH: Broadcasting Control Channel), when the location information notified differs from the current location information, the outdoor device 6a
A new location registration is performed by executing a location registration sequence (for example, the RCD-STD-27 standard) between the PHS terminal 4 and the PHS terminal 4. Thereafter, between the outdoor device 6a and the PHS terminal 4, a control channel (common control channel (CCCH: Co
mmon Control Channel)-Paging channel (PC
H: Paging Channel) / Channel for individual cell (SCC)
Through an H: Signaling Control Channel, a request for an information channel (TCH: Traffic Channel) for incoming call, outgoing call, location registration, incoming call response, and link establishment thereof are performed.

Further, a communication channel (TCH-Fast Associated Control Channel (FACCH)) is used.
hannel) / High-speed associated control channel (SACCH: SlowAC)
CH) to transmit information necessary for communication (dial information, function selection information, etc.), and also to transmit voice data and communication data. Further, when the PHS terminal 4 moves from the cell of the outdoor device 6a to another cell, the PHS terminal 4 detects a decrease in the received electric field strength and detects a decrease in the mobile field.
(sisted) Communication is continued through the next destination cell by the handover procedure.

In this operation, in the case of a telephone call, the PDC terminal 3 and the PHS terminal 4 are exchanged with the connected telephone terminal by codec processing, but in the case of transmission of communication data, the original signal is transmitted. (Communication data) is exchanged with the data terminal of the connection destination through processing by a non-telephone adapter (ADP).

FIG. 4 is a flowchart showing a processing procedure of the operation of the embodiment of the present invention. In this procedure,
The client 1 in FIG. 1 makes a call connection request to the server 8 (step S10). This call connection request is input to the multiplexer 2 on the client side. In the multiplexing device 2 shown in FIG. 2, the call control unit 9 receives a call connection request from the client 1 through the interface (I / F) and the division / combination processing unit 10. The call control unit 9 sends a call connection request from the PDC packet processing unit 11 to the PDC terminal 3 via an interface (I / F).

The PDC terminal 3 transmits a control channel (CCCH-PCH / SC) to the cell base station 5a that has registered the location.
CH) to request a call information channel / time slot (TCH) and establish a link therefor. Thereafter, the server 8 corresponding to the specified address (telephone number)
Is connected through the multiplexing device 7 on the server side. Thus, data communication is performed between the client 1 and the server 8 by the PDC network 5 (PDC-TS) (step S11).

The P between the client 1 and the server 8
The data communication by the DC network 5 is a pay-as-you-go system. Therefore, when the amount of communication data from the client 1 to the server 8 is small, it is economically advantageous, and a line connection for constantly transmitting communication data becomes possible. When a connection request is made from the client 1 to the server 8, the telephone number of the PHS terminal 4 is notified. The telephone number of this PHS terminal 4 is
The call control unit 16 of the multiplexing device 7 on the server side takes in and stores it.

The call control unit 9 of the multiplexer 2 on the client side determines the line disconnection request from the client 1 (step S12). Here, when the call control unit 9 receives the line disconnection request (Yes), the call control unit 9 executes the control of the line disconnection, and the data communication ends (step S13). If the call control unit 9 does not receive the line disconnection request in step S12 (No), the data amount measurement unit 20 of the multiplexing device 7 on the server side monitors the communication data amount from the client 1 to the server 8. Then, the communication data amount per time is measured and notified to the call control unit 16 (step S14).

If the communication data amount measured by the data amount measuring unit 20 has not increased beyond the predetermined value (No), the call control unit 16 returns to step S11, and returns to step S11.
(PDC-TS) only client 1 and server 8
Executes data communication with. Step S11
If the communication data amount measured by the data amount measurement unit 20 is larger than a predetermined value (Yes), the call control unit 16 of the multiplexer 7 on the server side
Reads out the telephone number stored in advance, and sends this selection signal from the PIAFS processing unit 18 to the interface (I /
F) to send (call) to the PHS network 6 (step S15).

With this call, the line connection with the PHS terminal 4 is made through the PHS network 6 and the outdoor device 6a. The PHS terminal 4 notifies the PIAFS processing unit 12 of the multiplexing device 2 on the client side of the line connection, and the call control unit 9 receives the notification of the line connection. The call control unit 9 controls the division / synthesis processing unit 10 to divide the communication data from the client 1 into two, and the PDC packet processing unit 11
It is sent to the IAFS processing unit 12. In the PDC network 5, data communication with a reduced communication data amount is performed by the current link. That is, data communication is performed by applying the economic advantage of the pay-as-you-go system. The PHS network 6 (P
The communication data from the client 1 is transmitted to the multiplexing device 7 on the server side through the PHS terminal 4 and the outdoor device 6a by a new link in HS). This gives P
Data communication is performed using the advantage of the high-speed data communication using the PIAFS standard of the HS network 6 (PHS) and the advantage of the time charging system.

The division / synthesis processing unit 19 of the multiplexing device 7
The PDC packet processing unit 1 is controlled by the call control unit 16.
7 and the communication data from the client 1 transmitted through the PIAFS processing unit 12 are taken in and combined. The combined communication data from the client 1 is sent to the server 8 via the interface (I / F) (step S16).

When the communication data is divided, the division / combination processing section 10 of the client-side multiplexer 2 inserts, for example, flag bits before and after the divided data and transmits the data. The division / combination processing unit 19 of the multiplexing device 7 on the server side combines the communication data divided by the multiplexing device 2 on the client side by identifying the flag.

Next, the data amount measuring unit 20 in the multiplexing device 7 on the server side monitors the amount of communication data that the division / combination processing unit 19 has acquired and combined. In this monitoring,
The data amount per time is measured and notified to the call control unit 16. The call control unit 16, when the communication data amount measured by the data amount measurement unit 20 has not decreased from the predetermined value (step S17: No), the process returns to step S16, the communication data by the PDC-TS and PHS Execute transmission. In the processing of step S17, when the communication data amount measured by the data amount measurement unit 20 is decreasing (Yes), the call control unit 16 of the multiplexing device 7 on the server side.
Controls the PIAFS processing unit 18 to execute the call disconnection (step S18).

This call disconnection is performed by the PHS network 6 and the outdoor device 6a.
This is performed for the PHS terminal 4 through. This call disconnection is performed by the PIAFS processing unit 12 of the multiplexer 2 on the client side.
Is notified to the call control unit 9 when is received. Call control unit 9
Controls the division / synthesis processing unit 10 so that the client 1
Stops dividing the communication data sent by
Return to That is, the PDC network 5 (PDC-T
Data communication between the client 1 and the server 8 is performed only by S).

As described above, in this embodiment, first, the communication data is transmitted from the client 1 using the low-speed PDC network 5 based on the usage-based charging system depending on the amount of communication data. When the amount of communication data increases, the communication data is divided and time-based charging and high-speed PH
Data communication on the S network 6 (PHS) is also used. After that, when the communication data amount decreases, the transmission by dividing the communication data is stopped, and the transmission of the communication data is switched to the PDC network 5 only.

As a result, the transmission of communication data by the PHS network 6 (PDC-TS) or the transmission of communication data by both the PDC network 5 and the PHS network 6 (PDC-TS or PHS) can be performed by a pay-per-use system. The selection can be made based on the economic advantages of the billing system and the advantages of the transmission speed.
Therefore, line connection is always possible between end and end, and efficient communication data transmission is enabled.

In this embodiment, the case where the communication data is transmitted from the client 1 to the server 8 has been described as the operation of the embodiment of the present invention, but the communication data is also transmitted from the server 8 to the client 1. Applicable as it is. For example, remote calling (RPC: Remote Pro
The present invention can be applied to a case where an execution program (communication data) in a Cedure Call is transmitted from the server 8 to the client 1 or a data communication when the server 8 manages a large number of clients 1.

In this case, the client-side multiplexer 2
The operation of the multiplexing device 7 on the server side is opposite to that described with reference to FIGS. That is, the operation of the client-side multiplexer 2 described above is
The configuration is such that the multiplexing device 7 on the server side is executed, and the operation of the multiplexing device 7 on the server side described above is executed by the multiplexing device 2 on the client side.

In this embodiment, the client 1
Considering the case where a portable PDA (Personal Digital Assistant) is used as the
And the PHS terminal 4 are arranged, and the server 8 is connected to the PDC network 5 and the PHS network 6 through the multiplexing device 7, but the reverse is also possible. That is, the client 1
When the mobile phone is not considered, the client 1 is connected to the PDC network 5 and the PHS network 6 through the multiplexer 2 and the PDC terminal 3 and the PHS terminal 4 are arranged on the server 8 side. In this case, the operation is the same, and the same advantages as described above are obtained.

Further, in the PHS in this embodiment,
A part of the network configuration can be configured using a known system of a different form. For example, the following three systems are known as the different types of systems. (1) PHS home system (fixed communication network (IS
(2) A PHS base station accommodated in a DN / PSTN is installed. (2) A PHS office system ( a plurality of PHS base stations installed in an office or an underground shopping mall is connected to a fixed communication network (IS
(3) Connect to a private branch exchange (PBX) accommodated in a DN / PSTN) (3) PHS outdoor system (fix a plurality of PHS base stations installed in each outdoor microcell service area (for example, up to several hundred meters) (Connect to the integrated base station accommodated in the communication network (ISDN / PSTN))

[0043]

As is apparent from the above description, according to the wireless data communication method and system of the present invention, first, a low-speed data transmission and a pay-as-you-go system between one and the other data communication devices are performed. 1 wireless communication network (PDC-TS)
Data communication is performed through. When the amount of communication data increases, one or the other data communication device divides the communication data to be used in both the first wireless communication network and the second wireless communication network (PHS) for high-speed data transmission and time charging. The transmitted and received divided communication data is synthesized. After this,
When the amount of communication data is reduced and the communication data is divided and transmitted, the one and the other data communication devices stop the transmission of the communication data by division and perform the data communication only by the first wireless communication network. Perform communication.

As a result, the transmission of communication data by the PDC-TS, or the transmission of communication data by both the PDC-TS and the PHS, is realized by the economical advantages of the pay-per-use system and the time-based system, and the advantages of the transmission speed. Based on this, it is possible to always connect the line between the end and the end.
Furthermore, efficient transmission of communication data becomes possible.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a wireless data communication method and system according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a detailed configuration of a client-side multiplexing device in the embodiment.

FIG. 3 is a block diagram illustrating a detailed configuration of a multiplexing device on a server side according to the embodiment.

FIG. 4 is a flowchart illustrating a processing procedure of an operation according to the embodiment;

[Explanation of symbols]

 Reference Signs List 1 client 2, 7 multiplexer 3 PDC terminal 4 PHS terminal 5 PDC network 5a cell base station 6 PHS network 6a outdoor equipment 8 server 9, 16 call control unit 10, 19 division / combination processing unit 11 PDC packet processing unit 12 PIAFS Processing unit 17 PDC packet processing unit 18 PIAFS processing unit 20 Data amount measurement unit

──────────────────────────────────────────────────の Continued on front page (51) Int.Cl. ⁷ Identification code FI H04Q 7/24 7/26 7/30

Claims (10)

(57) [Claims] 1. A first wireless communication network of a pay-per-use system,
First data communication device connected to a second wireless communication network
No data communication is performed between the device and the second data communication device.
In the line data communication method, the first data communication device is connected via the first wireless communication network.
To connect a call with the second data communication device.
Thereafter, the communication data is transmitted to the second data communication device.
Step, the second data communication device, the data of the communication data
The period during which the data amount is measured and the data amount exceeds the specified value
Is connected via the second wireless communication network while the call is connected.
To make a line connection with the first data communication device
Step, the first data communication device, at least during the period,
Also transmits communication data via the second wireless communication network to the second wireless communication network.
Transmitting to the data communication device of
Characteristic wireless data communication method. (2)Client connected to PDC network and PHS network
Wireless for data communication between the client device and the server device
In the data communication method, The client device communicates with the server via the PDC network.
After the call is connected with the server device, the communication data is transmitted to the server.
Transmitting to the server device; The server device measures a data amount of the communication data.
During the period when the data amount exceeds a predetermined value, the call
Connected to the client via the PHS network.
Establishing a line connection with the client device;  The client device is configured to have at least
The communication data is transmitted to the server via the PHS network.
Wireless data.
Communication method. 3. The method according to claim 2, wherein the client device connects to the PDC network.
When connecting a call with the server device via the
The client device is assigned in the PHS network.
Notifying the server device of the
3. The wireless data communication system according to claim 2, wherein
How to trust. 4. A client connected to a PDC network and a PHS network.
Wireless for data communication between the client device and the server device
In the data communication method, after the server device connects a call with the client device via the PDC network, the server device transmits communication data to the client device. Measuring a data amount and, during a period in which the data amount exceeds a predetermined value, performing a line connection with the server device via the PHS network while the call is connected; However, during the period, at least the PH
Transmitting communication data to the client device via an S-network. 5. When the server connects a call to the client via the PDC network, the server notifies the client of a telephone number allocated in the PHS network. The wireless data communication method according to claim 4, further comprising a step. 6. A data communication is performed between a first data communication device and a second data communication device connected to a first wireless communication network based on a pay-per-use system and a second wireless communication network based on a time-based system. In the wireless data communication system, the first data communication device connects a call with the second data communication device via the first wireless communication network, and then transmits communication data to the second data communication device. Means for transmitting to the device, the second data communication device measures the data amount of the communication data, and while the data amount exceeds a predetermined value, while the call is connected, the second data communication device 2 means for making a line connection with the first data communication device via a second wireless communication network, wherein the first data communication device further comprises at least the second wireless communication network during the period. Communication data via the second data communication Means for transmitting to a communication device. 7. A wireless data communication system for performing data communication between a client device connected to a PDC network and a PHS network and a server device, wherein the client device communicates with the server device via the PDC network. Means for transmitting communication data to the server device after connecting the call in the server device, wherein the server device measures a data amount of the communication data, and during a period in which the data amount exceeds a predetermined value, A means for making a line connection with the client device via the PHS network, wherein the client device further transmits communication data via at least the PHS network during the period. A wireless data communication system comprising means for transmitting to the server device. 8. The PDC network is connected to the client device.
When connecting a call with the server device via the
The client device is assigned in the PHS network.
Means for notifying the server device of the received telephone number.
8. The wireless data communication system according to claim 7, wherein
Stem. 9.Client connected to PDC network and PHS network
Wireless for data communication between the client device and the server device
In a data communication system, The server device communicates with the client via the PDC network.
After the call is connected to the client device, the communication data is
Means for transmitting to the client device,  The client device determines a data amount of the communication data.
Measurement, and the period when the data amount exceeds the specified value
With the call connected, the server is connected via the PHS network.
Means for making a line connection with the server device, wherein the server device further comprises:
The communication data is transmitted to the client device via the PHS network.
Wireless data comprising means for transmitting to
Communications system. 10. The method according to claim 1, wherein the server device is connected via the PDC network
Before connecting a call with the client device,
The server device is assigned in the PHS network.
Means for notifying the client device of a telephone number.
The wireless data communication according to claim 9, comprising:
system.