JP2937164B2 - Wireless communication line switching method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a wireless communication line switching system, and more particularly to a communication channel switching system for packet data communication in a digital car telephone system.

[0002]

2. Description of the Related Art Conventionally, this type of wireless communication line switching system has been used in a digital mobile telephone system when a mobile station moves between wireless zones or between sectors in a zone, or receives a wireless line being used. It is used for the purpose of continuing communication by switching to a destination wireless line or a high-quality wireless line when the quality is poor.

[0003] For example, the digital car telephone system standard RCR STD-27E includes an information channel (traffic channel: TCH) for transferring user information and user control information such as voice and facsimile information used in circuit switching. Switching technology is also the same RC
RSTD-27 describes control signal information used in packet switching and a channel switching technique of a user packet channel (UPCH) for transmitting a user packet.

[0004]

However, the conventional wireless communication line switching system has the following problems.

(1) In a digital car telephone system which provides both a circuit switching service and a packet switching service, a data processing method is different for each service, and monitoring of a peripheral zone by a mobile device is the same service. Because only the wireless lines are monitored,
The mutual channel switching between the communication channel used in the circuit switching service and the packet communication channel used in the packet switching service cannot be performed.

(2) Since there is no means for judging the amount of data to be transferred, the application, and the like, the mobile station cannot automatically select the optimal wireless line for the purpose of communication. A mobile station or a mobile station for packet switching is selected.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has been made in consideration of the above-described problems. In the event that a mobile station moves between a circuit switching service area and a packet switching service area, an It is intended to provide a wireless communication line switching method capable of continuously performing communication without performing line switching of a mobile device due to the above, and selecting an optimal wireless line for packet data communication use. I do.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a mobile packet mobile station for performing a communication operation, a packet terminal for controlling data transmission and reception in the mobile packet mobile station, An adapter serving as an interface between the mobile device and the packet terminal;
A base station that transmits and receives data to and from the packet mobile device by a circuit switching method; a packet base station that transmits and receives data to and from the packet mobile device by a packet switching method; and In a wireless communication circuit system comprising a switching unit for switching the base station and the packet base station, the packet mobile unit transmits and receives data to and from the base station by the circuit switching system, The transmission and reception of data with the packet base station by the packet switching method are automatically switched when a predetermined condition is satisfied.

[0009] When the packet mobile station moves out of a packet service area during data transmission / reception with the packet base station according to the packet switching system, the packet mobile station communicates with the packet base station according to the packet switching system. The transmission and reception of data between the base station and the base station according to the circuit switching method are automatically switched.

The adapter may further include a buffer for temporarily storing data transmitted from the packet terminal or the packet mobile station, a data transfer rate in the circuit switching system, and an execution transfer of data in the packet switching system. A data processing unit that compares the speed with the data processing unit, and when the data processing unit determines that the data transfer speed in the circuit switching system is faster than the execution transfer speed of data in the packet switching system, the data is stored in the buffer. A buffer amount determining unit that determines whether the amount of data stored is greater than a predetermined reference value, and determining that the amount of data accumulated in the buffer is greater than a predetermined reference value. If done,
A data control unit for sending a circuit switching switching request to the packet mobile station, wherein the packet mobile station transmits and receives the data to and from the packet base station by the packet switching system. Based on the switching request sent from the control unit, transmission and reception of data to and from the packet base station by the packet switching method are automatically performed to transmission and reception of data to and from the base station by the circuit switching method. It is characterized by switching.

[0011] The packet mobile station includes a receiving unit for receiving data transmitted from the base station, a demodulation unit for demodulating data received by the receiving unit, and a process for processing data to be transmitted. A packet processing unit to perform, an exchange control unit that outputs data demodulated by the demodulation unit to the packet processing unit, and outputs data processed by the packet processing unit; A modulating unit that modulates the output data, a transmitting unit that transmits data modulated by the modulating unit to the base station, and, based on the data demodulated by the demodulating unit, A detection control unit for detecting the state of the wireless line in the detection and surrounding zones, an adapter interface unit for interfacing with the adapter, and a determination result in the detection control unit or And having a control unit for switching the operation of the packet processing unit based on an instruction inputted from the adapter through the adapter interface unit.

The packet processing unit may include a buffer for temporarily storing data input via the adapter interface unit, a packet processing unit for performing data processing corresponding to the packet switching system, A line processing unit that performs data processing corresponding to a circuit switching system, a switching control unit that switches between the packet processing unit and the line processing unit under the control of the control unit, the switching control unit, and the packet. And a line control unit for exchanging data with the line processing unit.

The adapter further includes a buffer for temporarily storing data transmitted from the packet terminal or the packet mobile device, a buffer amount determining unit for determining an amount of data stored in the buffer, When the buffer amount determining unit determines that the amount of data stored in the buffer has become 0, the data control unit sends a switching request for circuit switching to the packet mobile device, The packet mobile device, based on a switching request sent from the data control unit during transmission and reception of data with the base station by the circuit switching method,
The transmission / reception of data with the base station by the circuit switching method is automatically switched to the transmission / reception of data with the packet base station by the packet switching method.

[0014] The packet mobile station includes a receiving unit for receiving data transmitted from the base station, a demodulation unit for demodulating data received by the receiving unit, and a process for processing data to be transmitted. A packet processing unit to perform, an exchange control unit that outputs data demodulated by the demodulation unit to the packet processing unit, and outputs data processed by the packet processing unit; A modulating unit that modulates the output data, a transmitting unit that transmits data modulated by the modulating unit to the base station, and, based on the data demodulated by the demodulating unit, A detection control unit for detecting the state of the wireless line in the detection and surrounding zones, an adapter interface unit for interfacing with the adapter, and a determination result in the detection control unit or And having a control unit for switching the operation of the packet processing unit based on an instruction inputted from the adapter through the adapter interface unit.

The packet processing unit may include a buffer for temporarily storing data input via the adapter interface unit, a packet processing unit for performing data processing corresponding to the packet switching system, A line processing unit that performs data processing corresponding to a circuit switching system, a switching control unit that switches between the packet processing unit and the line processing unit under the control of the control unit, the switching control unit, and the packet. And a line control unit for exchanging data with the line processing unit.

In addition, there is provided an interworking device having a function of performing processing for transmitting and receiving data transmitted from the packet mobile device to the Internet network,
The interworking device includes: a buffer for temporarily storing data transmitted from the Internet network; and a data processing unit for comparing a data transfer speed in the circuit switching system with an execution transfer speed of data in the packet switching system. When the data processing unit determines that the data transfer speed in the circuit switching system is faster than the effective transfer speed of data in the packet switching system, the amount of data stored in the buffer is predetermined. A buffer amount determining unit that determines whether the data amount is larger than a reference value; and, when the buffer amount determining unit determines that the amount of data stored in the buffer is larger than a predetermined reference value, A data control unit for sending a circuit-switching switching request to the mobile device; Transmission and reception of data with the packet base station by the packet switching method based on a switching request sent from the data control unit during transmission and reception of data with the packet base station by the packet switching method Automatically switches to data transmission / reception with the base station using the circuit switching method.

In addition, there is provided an interworking device having a function of performing processing for transmitting and receiving data transmitted from the packet mobile device to the Internet network,
The interworking device includes: a buffer in which data transmitted from the Internet network is temporarily stored; a buffer amount determining unit that determines an amount of data stored in the buffer; And a data control unit for sending a circuit-switching switching request to the packet mobile device when it is determined that the amount of data stored in the packet mobile device has become zero. A packet switching unit that transmits and receives data to and from the base station by the circuit switching method based on a switching request transmitted from the data control unit during transmission and reception of data to and from the base station by the switching method. It automatically switches to data transmission / reception with the packet base station according to a system.

Also, the adapter includes a data processing unit for analyzing a protocol in data transmitted from the packet terminal, and a circuit switching unit for the packet mobile station based on an analysis result in the data processing unit. A data control unit for transmitting a switching request, wherein the packet mobile station transmits / receives data to / from the packet base station by the packet switching system based on the switching request transmitted from the data control unit. And automatically transmitting and receiving data to and from the base station using the circuit switching method.

(Operation) In the present invention configured as described above, in the packet mobile station, data transmission / reception to / from the base station by the circuit switching system and communication between the packet base station by the packet switching system are performed. Sending and receiving data
The switching is performed automatically when a predetermined condition is satisfied. Therefore, when the packet mobile device moves between the circuit switching service area and the packet switching service area, the line switching of the mobile device by the operator is performed. Communication is performed continuously without performing the communication.

When it is determined that the data transfer rate at the time of packet switching is lower than the data transfer rate at the time of circuit switching, the amount of data stored in the buffer is determined.
When the line switching of the packet mobile device is performed when it is determined that the data amount is larger than the reference value, a wireless line most suitable for the purpose of the packet data communication is selected.

Also, when the line switching of the packet mobile station is performed based on the application protocol, the most suitable wireless line for the purpose of packet data communication is selected.

[0022]

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

(First Embodiment) FIG. 1 is a system configuration diagram showing an embodiment of a wireless communication line switching system according to the present invention.

In this embodiment, as shown in FIG. 1, a mobile packet mobile station 3 in which a communication operation is performed, and a DTE (Data Terrier) for controlling transmission and reception of data in the packet mobile station 3.
The mobile terminal 3 transmits and receives circuit-switching data to and from the packet terminal 1 via the communication channel 4, and the adapter 2 serving as an interface between the packet terminal 1 and the packet terminal 1. A packet base station for transmitting and receiving packet exchange data between the base station 6 for monitoring the communication channel 4 and the packet mobile station 3 via the packet communication channel 5 and for monitoring the packet communication channel 5 Station 7, an exchange 8 for switching the base station 6 and the packet base station 7, a location register 9 in which subscriber information and mobile station information are registered, and an Internet network 11 for data transmitted from the packet mobile station 3. And a packet interworking device 10 having a function of performing transmission processing and reception processing to the That. Note that all components except the Internet network 11 may be composed of a plurality of components.

In the system configured as described above, the packet mobile device 3 obtains an IP address and transmits / receives an IP packet to / from a terminal connected to the Internet network 11. Note that the IP address of the packet mobile device 3 may be a previously obtained IP address or an IP address assigned from the network side at the time of starting communication. The IP address may be a private address unique only within the system or a global address unique worldwide.

FIG. 2 is a block diagram showing a first embodiment of the adapter 2 shown in FIG.

As shown in FIG. 2, the adapter 2 in the present embodiment includes a terminal interface 12 for interfacing with the packet terminal 1, a mobile device interface 16 for interfacing with the packet mobile device 3, a packet terminal 1 or a packet transfer device. A buffer 13 for temporarily storing data transmitted from the mobile device 3, a data control unit 14 and a data processing unit 15 for processing the control signal and the data signal transmitted from the packet mobile device 3.

In the adapter 2 configured as described above, the data control unit 14 and the data processing unit 15
Transmission and reception of packet data are controlled based on a clock and a frame pulse transmitted from the packet mobile device 1.

FIG. 3 is a block diagram showing an embodiment of the packet mobile station 3 shown in FIG.

As shown in FIG. 3, the packet mobile station 3 in the present embodiment includes a receiving unit 17 for receiving data transmitted from the base station 6 or the packet base station 7, and a receiving unit 17
, A demodulation unit 19 for demodulating the data received, a packet processing unit 24 for processing the data to be transmitted, and outputting the data demodulated by the demodulation unit 19 to the packet processing unit 24. An exchange control unit 22 that outputs data processed by the processing unit 24;
Modulating section 21 that modulates data output from, transmitting section 18 that transmits data modulated by modulating section 21 to base station 6 or packet base station 7, and data that is demodulated by demodulating section 19. Detection section 20 for detecting the radio line in use and determining the status of the radio line in the peripheral zone based on
And an adapter interface unit 20 for interfacing with the adapter 2, and control for switching the operation of the packet processing unit 24 based on a result of the determination by the detection control unit 20 or an instruction input from the adapter 2 via the adapter interface unit 29. The packet processing unit 24 includes a buffer 30 in which data input through the adapter interface unit 29 is temporarily stored, and data corresponding to the frame format of the packet communication channel 5. A packet processing unit 26 that performs processing, a line processing unit 27 that performs data processing corresponding to the frame format of the communication channel 4, and a packet processing unit 26 and a line processing unit 27 that are controlled by the control unit 23. A switching control unit 28 that performs switching, an exchange control unit 22, and a packet Preparative processing unit 26 and the line processing unit 2
And a line control unit 25 for exchanging data with the network control unit 7.

The packet mobile station 3 configured as described above
, The detection control unit 20 measures the state of the radio line being used, and if the state of the radio line is equal to or less than a predetermined threshold, the channel switching request signal is transmitted to the base station 6 or the packet Transmitted to the base station 7,
When the channel switching is permitted, the communication is continuously performed by using the switching destination line.

Here, when communicating with the base station 6 via the communication channel 4, data processing in accordance with the communication channel frame format is performed by the line processing unit 27, and the packet communication channel 5 is used. When communication is performed with the packet base station 7 through the packet processing unit 26, the packet processing unit 26 performs data processing according to the packet communication channel frame format. The process switching in the packet processing unit 24 is performed by the control unit 23 based on the line type notified from the detection control unit 20 to the control unit 23.
8.

FIG. 4 is a flow chart for explaining the operation of the packet mobile station 3 shown in FIG. 3 at the time of radio line switching.

First, in the detection control unit 20, the electric field strength of the packet communication channel in use is measured, and it is periodically determined whether or not the measured electric field strength has reached a threshold value (step S1).

If it is determined in step S1 that the measured electric field strength is equal to or higher than the threshold value, the line in use is continuously used, and a timer is started from that point (step S2).

When a predetermined time elapses after the start of the timer in step S2, a timeout occurs in step S1.
Return to (Step S3).

On the other hand, if it is determined in step S1 that the measured electric field strength is less than the threshold value, it is necessary to switch the radio channel, and the packet communication for the peripheral zone that can be used as the switching destination radio channel in the peripheral zone. It is searched whether there is a channel (step S4).

If it is determined in step S4 that there is no communicable packet communication channel, it is searched for a usable communication channel in the surrounding zone (step S5).

If it is determined in step S5 that there is a communicable communication channel, the packet base station 7
(See FIG. 1), a wireless line switching request is transmitted,
Switching to a new communication channel is performed (step S6).

When switching to a new communication channel is performed in step S6, a timer is started from that point (step S7).

When a predetermined time elapses after the timer is started in step S7 (step S8), it is searched whether there is an available packet communication channel in the surrounding zone (step S9).

When it is determined in step S9 or S4 that there is a communicable packet communication channel, a communication line switching request is transmitted to the packet base station 7 (see FIG. 1), and a new packet communication channel is transmitted. Switching to a channel is performed (step S10).

When switching to a new packet communication channel is performed in step S10, step S2 is performed.
And the timer starts.

On the other hand, if it is determined in step S9 that there is no communicable packet communication channel, the electric field strength of the packet communication channel being used is measured, and it is determined whether the measured electric field strength has reached the threshold value. It is determined (step S11).

If it is determined in step S11 that the measured electric field strength is equal to or higher than the threshold, the process returns to step S2. If it is determined that the measured electric field strength is lower than the threshold, the processing returns to step S2. It returns to step S5.

If it is determined in step S5 that there is no communicable communication channel, it is determined that the communication channel is outside the service area of the system, and the communication is terminated (step S12).

FIG. 5 is a diagram showing an embodiment of a wireless area to which the system shown in FIG. 1 is applied. FIG. 5A shows a wireless service area of the base station 6, and FIG. FIG. 3 is a diagram showing a wireless service area of the base station 7, and FIG. 3 (c) is a diagram showing a service area of the entire system.

As shown in FIG. 5, the service area of the entire system is constituted by appropriately arranging the service area of the base station 6 and the service area of the packet base station 7.

The area indicated by PA1 and PA2 in FIG. 5C is the service area of the packet base station 7, and when the packet mobile station 3 exists in this service area, the packet mobile station 3 and the packet base station 7 The transmission / reception of user data is performed via the packet communication channel 5 between the user and the server.

The service area of the base station 6 corresponding to the circuit switching is within the area indicated by LA1 to LA18 in FIG. 5 (c).
Is located, transmission / reception of user data is performed between the packet mobile device 3 and the base station 6 via the communication channel 4.

Here, the packet mobile station 3 changes from LA1 to L
When moving to A2 or when moving from PA1 to PA2, it is necessary to switch the radio line.

As shown in FIGS. 5A and 5B,
Each of the base station 6 and the packet base station 7 has a three-sector configuration, and it is necessary to switch the radio line even when moving between sectors.

(Second Embodiment) FIG. 6 is a block diagram showing a second embodiment of the adapter 2 shown in FIG.

As shown in FIG. 6, the adapter 2 in the present embodiment detects the amount of data stored in the buffer 13 and compares the detected amount of data with a predetermined reference, as shown in FIG. The only difference is that a buffer amount determination unit 33 that determines whether the detected data amount is larger or smaller than the reference value is provided as compared with the value. The reference value is a data amount in which the amount charged when certain data is transmitted by circuit switching is equal to the amount charged when transmitted by packet switching.

Hereinafter, the switching operation of the wireless line using the adapter configured as described above will be described with reference to FIGS. 1, 3 and 6.

When communication is performed in the packet mobile device 3 using the packet switching system, the data processing unit 15 determines the effective transfer rate of data based on the number of packets transmitted in a fixed time. .

If it is determined that the transfer speed is lower than the transfer speed at the time of circuit switching, the buffer amount determination unit 3
In 3, it is determined whether or not the amount of data stored in the buffer 13 is larger than a predetermined reference value. When it is determined that the amount of data stored in the buffer 13 is larger than a predetermined reference value, the data control unit 14
A request for switching to circuit switching is sent to the control unit 23 of the packet mobile device 3 via the mobile device interface 16.

Then, the control section 23 of the packet mobile device 3 sends an instruction to the detection control section 20 to capture the communication channel.

After the capture, the communication is continuously performed by the circuit switching method, but the amount of data stored in the buffer 13 becomes zero.
Then, the data control unit 14 sends a request for switching to packet switching to the control unit 23 of the packet mobile device 3 via the mobile device interface 16.

Then, the control section 23 of the packet mobile device 3 sends an instruction to the detection control section 20 to capture the packet communication channel.

Similarly, the interworking device 10 is also provided with a data control unit, a data processing unit, a buffer, and a buffer amount determination unit, and measures the effective transfer rate based on the number of packets transmitted to the exchange 8. If the effective transfer rate is lower than the transfer rate at the time of circuit switching, it is determined whether or not the amount of stored data transmitted from the Internet network 11 is larger than a reference value. When it is determined that the data amount is larger than the reference value, a channel switching instruction is transmitted to the packet mobile device 3 via the exchange 8 and the base station 6.

Then, in the packet mobile station 3, the communication line is switched to the communication channel and communication is performed. Thereafter, when the amount of data stored in a buffer (not shown) of the interworking device 10 becomes zero, an instruction to switch to the packet communication channel is sent to the packet mobile device 3.

This embodiment has an effect that the transfer efficiency can be improved when a large amount of data is generated.

(Third Embodiment) The data processing unit 15 of the adapter shown in FIG.
) Is analyzed.

As a result of the protocol analysis, file transfer,
For example, when a set of data represented by FTP is transmitted and received at one time, an instruction to perform communication connection by a circuit switching method is notified from the data processing unit 15 to the data control unit 14.

Also, homepage access, for example, HT
In the case where a small amount of data represented by TP or TELNET is transmitted and received separately many times, an instruction to perform communication connection by the packet switching method is notified from the data processing unit 15 to the data control unit 14. .

Then, in the data control unit 14, a request for performing communication in the required switching system is transmitted from the packet mobile device 3 to the control unit 23 via the mobile device interface 16. Thereafter, the control unit 23 instructs the detection control unit 20 to capture the requested line.

In the present embodiment, there is an effect that a radio line can be used efficiently by selecting a line appropriate for an application.

[0069]

Embodiments of the present invention will be described below.

The configuration of the present embodiment is basically the same as that shown in FIG. 1. The packet terminal 1 is a personal computer (PC), and the adapter 2 is an RS232.
It is connected to the packet terminal 1 by the C interface or PCMCIA, and is connected to the packet mobile device 3 by a dedicated interface.

FIG. 7 is a diagram showing a service area of a digital car telephone system in which a circuit switching service and a packet switching service can be used together.

Hereinafter, the operation of this embodiment will be described with reference to FIGS. 1 to 4 and FIGS. 6 to 8.

In FIG. 7, the mobile station MS is moving in the direction of the LA 10, and the IP packet data communication is started using the packet communication channel 4 within the service area of the PA 1.

First, a method of monitoring and switching the state of a wireless line will be described with reference to FIG.

In step S1, the packet mobile station 3
The line state of the packet communication channel 5 is detected by the detection control unit 20 at a constant period. Here, mobile station M
When S moves out of the service area of PA1, the electric field strength of the packet communication channel 5 becomes smaller than a predetermined threshold.

When the electric field strength of the packet communication channel 5 becomes smaller than the threshold value, an available packet communication channel is searched for in the peripheral zone monitored on the packet communication channel 5 in step S4. You. However, at the destination, the service area LA1 of the base station is
Only 0 exists, and the packet is not serviced. Since there is no packet communication channel 5 to be switched to, a usable communication channel 4 is searched in the surrounding zone in step S5, and the information of the search result is given to the packet mobile device 3. In this case, LA
Since ten communication channels 4 are available, LA1
A channel switching request is transmitted from the packet mobile device 3 to the base station 6 having a service area of 0.

When the base station 6 and the exchange 8 receive the channel switching request sent from the packet exchange 3, a channel switching instruction is sent from the base station 6 to the packet mobile station 3, and the exchange 8 The fact that IP packet communication is performed by the packet mobile device 3 using the communication channel 5 is stored in the location register 9.

As a result, the data transmitted from the packet mobile device 3 is transmitted to the packet interworking device 10.

When the packet interworking device 10 recognizes that the IP packet communication is being performed via the communication channel 4, the wireless protocol termination process is performed.

As a result, in the packet mobile station 3,
The IP packet data communication is continuously performed using the communication channel 4.

FIG. 8 is a diagram showing a radio line frame format in the radio communication line switching system of the present invention.
(A) is a diagram showing a format in a communication channel, and (b) is a diagram showing a format in a packet communication channel.

Referring to FIGS. 3 and 8, the switching operation of the packet mobile station 3 from the packet communication channel 5 to the communication channel 4 will be described in further detail.

The detection control unit 20 monitors the quality of the radio channel used and monitors the status of the radio channel in the surrounding zone. While the packet communication channel 5 is used, the packet processing unit 26 arranges user data and various control codes in the CAC of the packet communication channel frame shown in FIG. 8B. .

When the detection control unit 20 detects that the electric field strength of the packet communication channel 4 has become lower than the threshold value, the packet communication channel usable from the peripheral zone information on the packet communication channel 4 4 is searched.

Since there is no usable packet communication channel 4, an available communication channel 5 is searched from the peripheral zone information of the broadcast information.

When the usable communication channel 5 is searched, the detection control unit 20 is transmitted via the modulation unit 21 and the transmission unit 18.
Sends a channel switching request to the base station 6,
, Via the receiving unit 17 and the demodulating unit 19, the detection control unit 20 notifies the control unit 23 that the wireless channel is changed to the communication channel.

Then, the control unit 23 instructs the switching control unit 28 to switch the processing to the line processing unit 27 and sends a confirmation signal to the detection control unit 20 in response to the channel switching instruction. Is instructed.

At the time of switching, the IP data packet that has not been transmitted is processed again by the line processing unit 27.

After the channel is switched to the communication channel 4, the line processing unit 27 stores user data on the TCH (FACCH) of the communication channel frame shown in FIG. Are arranged. Here, in the uplink frame of the packet communication channel 5, the user data portion is 4 bits larger than the communication channel 4. This is based on whether 4 bits of “0” are added by the packet mobile device 3. The packet base station 7 removes “0” and processes the data as 224-bit data.

Next, in the mobile station MS, IP packet data communication is performed using the communication channel 4 within the service area of the LA 10, and the mobile station MS
Move into the service area of. The switching operation of the packet mobile device 3 from the communication channel 4 to the packet communication channel 5 at this time will be described with reference to FIG.

In step S 9, the available packet communication channel 5 is searched for every fixed period, and the search information is given to the detection control unit 20 of the packet mobile device 3.

Since there is a packet communication channel 5 having an electric field strength larger than the threshold value, PA1
Is transmitted from the packet mobile station 3 to the packet base station 7 serving as a service area.

When the base station 6 and the switch 8 receive the channel switching request sent from the packet switch 3, a channel switching instruction is sent from the base station 6 to the packet mobile station 3, and the switch 8 The packet mobile station 3 uses the packet communication channel 4 to
The fact that P packet communication is performed is stored in the location register 9.

Thus, the data transmitted from the packet mobile device 3 is transmitted to the packet interworking device 10.

When the packet interworking apparatus 10 recognizes that the IP packet communication is being performed via the packet communication channel 5, the wireless protocol termination processing is not performed.

[0096]

As described above, in the present invention,
In a packet mobile station, transmission and reception of data to and from a base station by a circuit switching method and transmission and reception of data to and from a packet base station by a packet switching method are automatically performed when predetermined conditions are satisfied. When the packet mobile device moves between the circuit switching service area and the packet switching service area, the communication is continuously performed without the operator switching the line of the mobile device. It can be carried out.

When it is determined that the data transfer rate at the time of packet switching is lower than the data transfer rate at the time of circuit switching, the amount of data stored in the buffer is determined.
If the line switching of the packet mobile station is performed when it is determined that the data amount is larger than the reference value, it is possible to select the most suitable wireless line for the purpose of packet data communication.

Also, in the case where the line of the packet mobile station is switched based on the application protocol, it is possible to select the most suitable wireless line for the purpose of packet data communication.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram showing an embodiment of a wireless communication line switching system according to the present invention.

FIG. 2 is a block diagram showing a first embodiment of the adapter shown in FIG. 1;

FIG. 3 is a block diagram showing one embodiment of the packet mobile station shown in FIG. 1;

FIG. 4 is a flowchart for explaining the operation of the packet mobile device shown in FIG. 3 at the time of wireless channel switching.

5A and 5B are diagrams showing an embodiment of a wireless area to which the system shown in FIG. 1 is applied, wherein FIG. 5A shows a wireless service area of a base station, and FIG. FIG. 3C is a diagram illustrating a service area, and FIG. 3C is a diagram illustrating a service area of the entire system.

FIG. 6 is a block diagram showing a second embodiment of the adapter shown in FIG. 1;

FIG. 7 is a diagram showing a service area of a digital car telephone system in which a circuit switching service and a packet switching service can be used together.

8A and 8B are diagrams showing a radio channel frame format in the radio communication channel switching system of the present invention, wherein FIG. 8A shows a format in a communication channel, and FIG. 8B shows a format in a packet communication channel. is there.

[Explanation of symbols]

 1 packet terminal 2 adapter 3 packet mobile device 4 communication channel 5 packet communication channel 6 base station 7 packet base station 8 exchange 9 location register 10 packet interworking device 11 internet network 12 terminal interface unit 13 buffer 14 data control unit 15 data Processing unit 16 Mobile unit interface unit 17 Receiving unit 18 Transmitting unit 19 Demodulation unit 20 Detection control unit 21 Modulation unit 22 Switching control unit 23 Control unit 24 Packet processing unit 25 Line control unit 26 Packet processing unit 27 Line processing unit 28 Switching Control unit 29 Adapter interface unit 30 Buffer 33 Buffer amount determination unit LA1 to LA18 Base station service area PA1, PA2 Packet base station service area MS base station

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ identification code FI H04Q 7/38 (58) Fields investigated (Int.Cl. ⁶ , DB name) H04B 7/24-7/26 H04M 3/00 H04M 7/00-7/16 H04L 11/00 H04Q 7/00-7/38

Claims (11)

(57) [Claims] 1. A mobile packet mobile device in which a communication operation is performed, a packet terminal for controlling transmission and reception of data in the packet mobile device, an adapter serving as an interface between the packet mobile device and the packet terminal, A base station that transmits and receives data to and from the packet mobile device by a circuit switching method; a packet base station that transmits and receives data to and from the packet mobile device by a packet switching method; and A wireless communication channel system comprising: a switching unit for switching the base station and the packet base station; wherein the packet mobile unit transmits and receives data to and from the base station by the circuit switching system; Transmission and reception of data with the packet base station by the packet switching method are performed under predetermined conditions. Wireless communication line switching method, wherein the switching is automatically performed when the condition is satisfied. 2. The wireless communication line switching system according to claim 1, wherein the packet mobile station moves out of a packet service area during data transmission / reception with the packet base station according to the packet switching system. A wireless communication line for automatically switching transmission and reception of data to and from the packet base station by the packet switching method to transmission and reception of data to and from the base station by the circuit switching method. Switching method. 3. The wireless communication line switching system according to claim 1, wherein the adapter includes: a buffer for temporarily storing data transmitted from the packet terminal or the packet mobile device; A data processing unit for comparing a data transfer speed with an effective transfer speed of data in the packet switching system; and a data transfer speed in the circuit switching system is higher than an effective transfer speed of data in the packet switching system in the data processing unit. A buffer amount determining unit that determines whether or not the amount of data stored in the buffer is greater than a predetermined reference value, when the buffer amount determining unit determines that the amount of data stored in the buffer is larger than a predetermined reference value. When it is determined that the data amount is larger than a predetermined reference value, the packet A data control unit for transmitting a circuit switching switching request, wherein the packet mobile station is transmitted from the data control unit during transmission / reception of data with the packet base station according to the packet switching system. Based on the switching request,
A wireless communication line switching system, which automatically switches transmission and reception of data to and from the packet base station by the packet switching system to transmission and reception of data to and from the base station by the circuit switching system. 4. The wireless communication line switching system according to claim 3, wherein the packet mobile device receives a data transmitted from the base station, and transmits the data received by the receiving unit. A demodulation unit for demodulating, a packet processing unit for processing data to be transmitted, and outputting the data demodulated by the demodulation unit to the packet processing unit, and the data processed by the packet processing unit. An exchange control unit that outputs data, a modulation unit that modulates data output from the exchange control unit, a transmission unit that transmits data modulated by the modulation unit to the base station, and a demodulation unit. Based on the data demodulated and demodulated, a detection control unit for detecting the status of the radio line in use and the status of the radio line in the peripheral zone, and an adapter interface unit for interfacing with the adapter And a control unit for switching the operation of the packet processing unit based on a determination result in the detection control unit or an instruction input from the adapter via the adapter interface unit. method. 5. The wireless communication line switching method according to claim 4, wherein the packet processing unit includes a buffer for temporarily storing data input via the adapter interface unit, and a packet switching system. A packet processing unit for performing corresponding data processing; a line processing unit for performing data processing corresponding to the circuit switching system; and switching between the packet processing unit and the line processing unit under the control of the control unit. A wireless communication line switching method, comprising: a switching control unit for performing data exchange between the switching control unit, the packet processing unit, and the line processing unit. 6. The wireless communication line switching system according to claim 1, wherein the adapter temporarily stores data transmitted from the packet terminal or the packet mobile device, and stores the data in the buffer. A buffer amount determining unit that determines the amount of data stored in the buffer, and when the buffer amount determining unit determines that the amount of data stored in the buffer has become 0, the packet mobile unit performs circuit switching. A data control unit for transmitting a switching request, wherein the packet mobile station is configured to transmit a switching request based on a switching request transmitted from the data control unit during transmission and reception of data with the base station by the circuit switching method. Transmitting and receiving data to and from the base station by the circuit switching method; and transmitting and receiving data to and from the packet base station by the packet switching method. Wireless communication channel switching method, wherein automatically switching it to the signal. 7. The wireless communication line switching method according to claim 6, wherein the packet mobile device receives a data transmitted from the base station, and transmits the data received by the receiving unit. A demodulation unit for demodulating, a packet processing unit for processing data to be transmitted, and outputting the data demodulated by the demodulation unit to the packet processing unit, and the data processed by the packet processing unit. An exchange control unit that outputs data, a modulation unit that modulates data output from the exchange control unit, a transmission unit that transmits data modulated by the modulation unit to the base station, and a demodulation unit. Based on the data demodulated and demodulated, a detection control unit for detecting the status of the radio line in use and the status of the radio line in the peripheral zone, and an adapter interface unit for interfacing with the adapter And a control unit for switching the operation of the packet processing unit based on a determination result in the detection control unit or an instruction input from the adapter via the adapter interface unit. method. 8. The wireless communication line switching system according to claim 7, wherein the packet processing unit includes: a buffer for temporarily storing data input via the adapter interface unit; A packet processing unit for performing corresponding data processing; a line processing unit for performing data processing corresponding to the circuit switching system; and switching between the packet processing unit and the line processing unit under the control of the control unit. A wireless communication line switching method, comprising: a switching control unit for performing data exchange between the switching control unit, the packet processing unit, and the line processing unit. 9. The wireless communication line switching system according to claim 1, further comprising: an interworking device having a function of transmitting and receiving data transmitted from the packet mobile device to the Internet network. A buffer for temporarily storing data transmitted from the Internet network; and a data processing for comparing a data transfer speed in the circuit switching system with an execution transfer speed of data in the packet switching system. A data amount stored in the buffer when the data processing unit determines that the data transfer rate in the circuit switching system is faster than the effective transfer speed of data in the packet switching system. A buffer amount determining unit for determining whether the buffer amount is larger than the reference value, When the determination unit determines that the amount of data stored in the buffer is larger than a predetermined reference value, the data control unit sends a circuit switching switch request to the packet mobile device, The packet mobile device, based on a switching request sent from the data control unit during transmission and reception of data with the packet base station by the packet switching system,
A wireless communication line switching system, which automatically switches transmission and reception of data to and from the packet base station by the packet switching system to transmission and reception of data to and from the base station by the circuit switching system. 10. The wireless communication line switching system according to claim 1, further comprising: an interworking device having a function of transmitting and receiving data transmitted from the packet mobile device to the Internet network. A buffer for temporarily storing data transmitted from the Internet network; a buffer amount determining unit for determining an amount of data stored in the buffer; and A data control unit that sends a circuit switching switch request to the packet mobile device when it is determined that the amount of data stored in the buffer has become 0; Based on a switching request sent from the data control unit during transmission and reception of data with the base station by the circuit switching method, A wireless communication line switching system, which automatically switches transmission and reception of data to and from the base station by the circuit switching system to transmission and reception of data to and from the packet base station by the packet switching system. 11. The wireless communication line switching system according to claim 1, wherein the adapter is configured to analyze a protocol in data transmitted from the packet terminal, and to provide an analysis result in the data processing unit. A data switching unit for sending a switching request for circuit switching to the packet mobile device, based on the switching request sent from the data control unit. Automatically switching between transmission and reception of data with the packet base station and transmission and reception of data with the base station according to the circuit switching method.