JPS59140733A - Mobile communication system - Google Patents

Abstract

PURPOSE:To use a circuit economically and efficiently by packeting data from a data terminal and sending the packeted data out of plural mobile equipments by using a control signal circuit and a talking circuit in common according to the data length of the packet, whether long or short. CONSTITUTION:The data inputted from the data terminal 2 is packeted by a packet device 3 and this packet is sent from the mobile equipment 5 to a center 10 through a base station 6, mobile telephone exchange 7, and packet exchanges 8 and 9. In this case, the packet device 3 decides the data length of the transmitted data; and a circuit indication signal indicating the use of the control signal circuit when the data length is short or the use of the talking circuit when long is included in the packet. The mobile equipment decides the kind of an in- use circuit by said circuit indication signal.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a mobile communication method (particularly a mobile communication system in which data from a data terminal is packetized and transmitted).

Background of the Technology In mobile communication systems such as car telephones, instant exchange is used to exchange information immediately, that is, exchange is performed by creating a connection path in which information is directly transmitted between the incoming and outgoing terminals of a switch network. The so-called circuit switching system (for example, Minoru Akiyama: Modern Communication Switching Engineering 4.1, January 20, 1970, Denki Shoin) is used.

Conventional technology and problems Conventional mobile communication systems such as car telephones (for example, Telecommunications Research Institute of the Telephone and Telecommunications Corporation, Research and Practical Application Report 1977, V
oL, 26, 167) uses a circuit switching method, but with this method there is a transmission interruption when switching wireless zones, and in data communication, small amounts of data are often sent and received in a conversational manner (two times being sent and received), and the data is not actually transmitted. The drawback is that the time spent transmitting and receiving data is short and the line is held ineffectively, increasing costs.

Purpose of the Invention In order to solve the drawbacks of the conventional technology, the present invention packetizes data from a data terminal. It is characterized by sharing lines and transmitting packetized data, and its purpose is to provide a mobile communication system that uses lines efficiently and economically.

This will be explained in detail below.

Embodiment of the Invention FIG. 1 shows an embodiment of the present invention, in which 1 is a mobile body such as a car, 2 is a data terminal mounted on the mobile body C2, and 5 is a packet for packetizing data sent from the data terminal 2. device, 4 is a telephone, 5 is a telephone 4 and a packet device 6 (a mobile device that connects the two and sends and receives radio waves, 6 is a base station that sends and receives radio waves to and from the mobile device 5, 7 is the location of the mobile device 5) Mobile telephone switching center 8 controls the area where the mobile telephone switching center 7 is located.
A packet switching center 9 is connected to the packet switching center 8 and a packet switching center 10 is connected to the center 10.
is a center that sends and receives data to and from the data terminal 2 and is connected to the packet switching center 9; A mobile telephone exchange, which is a home memory station,
12 is a packet switching center that connects the mobile telephone switching center 11 and the packet switching center 9; 16 is a telephone line that connects the base station 6 and the mobile telephone switching center 7 by wire; 17 is a mobile telephone switching center that connects the base station 6 and the mobile telephone switching center; Control signal line 1 connecting with station 7 by wire
Reference numeral 8 denotes a telephone line that connects the mobile telephone exchange 7 and the mobile telephone exchange 11, 19 a packet line that connects the mobile telephone exchange 7 and the packet exchange 8, and 2o the packet exchange between the mobile telephone exchange 7 and the packet exchange 8. Packet line connecting with station 9, 2
1 is a packet line connecting the packet switching center 9 and the center 10, 22 is a packet line connecting the packet switching center 9 and the packet switching center 12, and 23 is a packet connecting the packet switching center 12 and the mobile telephone switching center 11. 25 is a communication line that wirelessly sends packets from the mobile device 5 to the base station 6; 26 is a communication line that wirelessly sends packets from the base station 6 to the mobile device 5; 27 is a communication line that wirelessly sends packets from the mobile device 5 to the base station 6; A control signal line 28 is a control signal line for transmitting a control signal for connection from the base station 6 to the mobile device 5.

An example in which a car telephone system is used as an embodiment of the present invention will be described.

The car telephone system is provided with a voice line, a voice connection, and two necessary control signal lines. In this method, the mobile telephone exchange 11 indicates that the mobile station 5 is in the area of the mobile telephone exchange 7.
Register in . Based on the subscriber number of the data terminal 2, the packet switching center 8 can identify that the data terminal 2 is on the mobile unit 1. Transmission packets are determined by the data length, and packets with short data lengths are transmitted on the control signal line 17. is,
Packets with long data lengths are transmitted using the speech line 16.

First, the case of transmitting and receiving packets with short data lengths from the data terminal 2 to the center 1o will be described as an example. When the user inputs the subscriber number and data of the recenter 10 from the data terminal 2, the subscriber number of the center 10 and the subscriber number of the data terminal 2 are sent to the packet device 3. Packet device 3 is connected to data terminal 2 and center 1
It stores the subscriber number 0, determines that the data length is short, and packetizes a line instruction signal that instructs to use the control signal line 1, and furthermore (= data, subscriber number of data terminal 2, center A call request packet in which the subscriber number 10 and the mobile number of mobile device 5 are packetized is sent to mobile device 5. Mobile device 5 learns the use of the control signal line from the line instruction signal in the call request packet and controls it. A call request packet is sent to the base station 6 via the signal line 27. The base station 6 further sends the call request packet to the mobile telephone exchange 7 via the control signal line 17.

The mobile telephone exchange 7 further converts the call request packet into a configuration that can be received by the packet exchange 8 and sends the call request packet □
The packet is sent to the packet switching center 8 via the packet line 19. The packet switching center 8 adds the number of the packet switching center 80 to the call request packet, and determines the number of the packet switching center 90 that will be the destination packet switching center based on the subscriber number of the center 10 in the call request packet. The request packet is added to the call request packet, and the call request packet is sent to the packet switching center 9 via the packet line 20.

The packet switching center 9 transfers the call request packet to the packet line 2 based on the subscriber number of the center 10 in the call request packet.
1 to the center 10.

After checking the subscriber number of the data terminal 2 in the call request packet and processing the data, the center 10 receives the station number of the packet switching center 80 which will be the destination packet switching center.

A disconnection request packet containing the subscriber numbers of the data terminal 2 and the center 10 and the data to be sent to the data terminal 2 is sent to the packet switching center 9 via the packet line 21. The packet switching center 9 adds the packet switching center 90 station number,
Based on the station number of the packet switching center in the disconnection request packet, a packet is sent to the packet switching center 8 via the C2 packet line 20. The packet switching center 8 determines whether the data terminal 2 is connected to the mobile unit 1 based on the subscriber number of the data terminal 2 in the disconnection request packet.
(2), and sends a disconnection request packet to the mobile telephone exchange 7 via the packet line 19.The mobile telephone exchange 7 sends the subscriber number of the data terminal 2 in the disconnection request packet to the mobile telephone exchange 11. The mobile telephone switching center 11 determines the mobile device number and location area of the mobile device 5 based on the subscriber number of the data terminal 2, and sends it to the mobile telephone switching center 7 via the common signal line 18. The mobile telephone switching center 7 confirms that the location area information sent from the mobile telephone switching center 11 (from 2 to its own area (2 mobile vs. 5) exists, and adds the mobile device number of the mobile device 5 to the disconnection request packet. Furthermore, it converts the disconnection request packet into a disconnection request packet that can be received by the mobile device 5, determines that the control signal line is to be used because the data length in the disconnection request packet is short, and sends it to the wireless base station 6 via the control signal line 17. Send.

The base station 6 sends a disconnection request packet to the mobile device 5 via the control signal line 28. The mobile device 5 looks at the mobile device number in the disconnection request packet and, if it matches the mobile device number of the mobile device 5, sends a disconnection request packet to the packet device 3. The packet device 3 sends the data to the data terminal 2, packetizes the subscriber numbers of the data terminal 2 and the center 10, the mobile device number of the mobile JA 5, and the packet switching center 90 station number, and sends the data in the same manner as the call request packet. Send it to the center 10.

Next, the case where a call is made from the C second center 10 to the data terminal 2 will be explained. The center 10 packetizes the data to be sent to the data terminal 2, the subscriber number of the center 10, and the subscriber number of the data terminal 2, and sends it to the packet switching center 9 as a call request packet. The packet switching center 9 determines whether the data terminal 2 is on the mobile body ζ based on the subscriber number of the data terminal 2 in the call request packet.
2. He also learned that the mobile telephone exchange 11 is the mobile telephone exchange 11.
A location request packet for requesting the location of the mobile device 5 to which the subscriber number of the data terminal 2 has been added is sent to the packet switching center 12 nearest to the packet switching center 1. Packet switching center 12 sends a location request packet to mobile telephone switching center 11 via packet line 23. The mobile telephone switching center 11 determines the location and mobile device number of the mobile device 5 from the subscriber number of the data terminal 2, and sends it as a packetized answer packet to the packet switching center j2 via the packet line 26. is packet line 2
2 and then sent to the packet switching center 9.

The packet switching center 9 receives the mobile device 5 in the received reply packet.
The subscriber number of the data terminal 2 and the packet switching center 90 station number are packetized together with the mobile device number and location information of
It is sent as a call request packet to the packet switching center 8 via the packet line 20.

The packet switching center 8 receives the data terminal 2 in the call request packet.
Knowing that the packet is destined for the mobile telephone exchange 7 from the subscriber number of , it sends a call request packet to the mobile telephone exchange 7 via the packet line 19.

The mobile telephone exchange 7 converts the call request packet into a configuration that the mobile device 5 can receive, and determines that the control signal line is being used because the data length in the call request packet is short, and sends the control signal.
A call request packet is sent to the base station 6 via the line 17. The base station 6 sends a call request packet to the mobile device 5 via the control signal line 28.

The mobile device 5 sends a call request packet to the packet device 3, and the packet device 3 sends the data to the data terminal 2 after confirming the subscriber number of the center 10 in the call request packet.

↓ When the user inputs data from the data terminal, the packet device 3 that received the data determines that the data length is short, packetizes the line instruction number that instructs to use the control signal line, and sends the data to the destination packet. A disconnection request packet in which the station number of the packet switching center 9 serving as the switching center, the subscriber numbers of the center 10 and the data terminal 2 are packetized is sent to the mobile device 5. The mobile station 5 learns of the use of the control signal line from the line instruction signal in the disconnection request packet and sends a disconnection request packet to the base station 6 via the control signal line 27, and the base station 6 sends the disconnection request packet to the mobile telephone exchange via the control signal line 17. Send to 7.

The mobile telephone switching center 7 converts the disconnection request packet into a configuration that can be received by the packet switching center 8, and sends the disconnection request packet to the packet switching center 8 via the packet line 19. The packet switching center 8 adds the station number of the para4 packet switching center 8,
Based on the packet switching center 90 station number in the disconnection request packet, a disconnection request packet is sent to the packet switching center 9 via the packet line 20. Based on the subscriber number of the center 10 in the disconnection request packet, the packet switching center 9
Sends a disconnection request packet to 0.

The center 10 packetizes the subscriber numbers of the center and data terminal 2, and the mobile number of the mobile device 5, and sends it to the packet switching center 9 as a disconnection confirmation packet.

The packet switching center 9 sends a disconnection confirmation packet to the packet device 3 in the same manner as when sending the call request packet.

Next (taking as an example the case of sending and receiving a packet with a long data length, we will first explain the case where a call is made from the data terminal 2 to the center 1o. When the user inputs the subscriber number and data of the center 10 from the data terminal 2, the center The subscriber number of 10, the subscriber number of data terminal 2, and data are sent to packet device 6. Packet device 3 stores the data, the subscriber number of data terminal 2, and center 1°, and further uses the control signal line. A call request packet is sent to the mobile device 5, which is a packetization of a line instruction signal instructing the data terminal 2, the subscriber number of the data terminal 2, the subscriber number of the center 10, and the mobile device number of the mobile device 5.The mobile device 5 controls A call request packet is sent to the base station 6 via the signal line 25.

The base station 6 further sends out a control signal to the mobile telephone switching center 7 via a control signal line 17.

The mobile telephone exchange 7 further converts the call request packet into a configuration C that can be received by the packet exchange 8 and sends the call request packet to the packet exchange 8 via the packet line 19. The packet switching center 8 adds the number of the packet switching center 80 to the call request packet, and determines the number of the packet switching center 90 that will be the destination packet switching center based on the subscriber number of the center 10 in the call request packet. The request is added to the call request packet, and the call request packet is sent to the packet switching center via the packet line 20. Send to. The packet switching center 9 transmits a call request packet to the center 10 via the packet line 21 based on the subscriber number of the center 10 in the call request packet.

After confirming the subscriber number of the data terminal 2 in the call request packet, the center 10 sends a response packet containing the number of the packet switching center 80 that will be the destination packet switching center, and the subscriber numbers of the data terminal 2 and the center 10. Packet line 2
1 and then sent to the packet switching center 9. The packet switching center 9 adds the station number of the packet switching center 90 and sends a response packet to the packet switching center 8 via the packet line 2o based on the station number of the packet switching center in the response packet. Based on the subscriber number of the data terminal 2 in the packet, the data terminal 2 identifies that there is a mobile unit 1 (2), and sends a response packet to the mobile telephone switching center 7 via the packet line 19.The mobile telephone switching layer 7 receives the response packet. The mobile telephone exchange 11 sends the subscriber number of the data terminal 2 in The location area is determined and sent to the mobile telephone exchange 7 via the common signal line within one day.

The mobile telephone exchange 7 confirms that the mobile station 5 is in its own area based on the location area information (2) sent from the mobile telephone exchange 11, adds the mobile unit number of the mobile station 5 to the response packet (2), and sends a response. A configuration in which the packet can be received by the mobile device 5 (converted into two and sent to the wireless base station 6 via the control signal line 17).

The base station 6 sends a response packet to the mobile device 5 via the control signal line 28. The mobile device 5 looks at the mobile device number in the response packet and, if it matches the mobile device number of the mobile device 5, sends a response packet to the packet device 35. The packet device 6 determines that a telephone line is being used based on the length of the accumulated data.
Packetizes the line instruction signal that instructs the use of the telephone line,
Furthermore, the subscriber numbers of the center 10 and the data terminal 2, the mobile number of the mobile device 5, and the data are each packetized and sent to the mobile device 5 as a data packet. Knowing the line usage, it sends a data packet to the base station 6 via the communication line 25.

The base station 6 further connects to a mobile telephone exchange 7 via a telephone line 16.
Send to.

Mobile telephone switching center 7 further converts the data packet into a configuration that can be received by packet switching center 8, and sends the data packet to packet switching center 8 via packet line 19. The packet switching center 8 includes the packet switching center 8 in the data packet.
0 is added to the station number, and based on the subscriber number of 7yri 1o in the data packet, the 90th station number of the packet switching station that will be the destination packet switching center is calculated. 20 to packet switching center 9
Send to. The packet switching center 9 transmits the data packet to the center 10 via the packet line 21 based on the subscriber number of the center 10 in the data packet.

After confirming the subscriber number of the data terminal 2 in the data packet, the center 10 packetizes the data packet with the station number of the packet switching center 80 which will be the destination packet switching center, and the subscriber numbers of the data terminal 2 and the center 10. Line 2
1 and then sent to the packet switching center 9. The packet switching center 9 adds the packet switching center 90 station number, and based on the station number of the packet switching center in the data packet (two packet lines 2
The data packet is sent to the packet switching center 8 via o.

The packet switching center 8 identifies that the data terminal 2 is located in the mobile unit 1 from the subscriber number of the data terminal 2 in the data packet, and sends the data bucket 1 to the mobile telephone switching center 7 via the packet line 19. The mobile telephone exchange 7 sends the subscriber number of the data terminal 2 in the data packet to the mobile telephone exchange 11 via the common signal line 18, and the mobile telephone exchange 11 moves based on the subscriber number of the data terminal 2. The mobile device number and location area of the device 5 are obtained and sent to the mobile telephone exchange 7 via the common signal line 18.

The mobile telephone switching center 7 confirms that the mobile terminal 5 is in its own area from the location area information C2 sent from the mobile telephone switching center 11, and adds the mobile terminal number of the mobile terminal 5 to the data packet (=data packet is converted into a configuration that can be received by the mobile device 5, the use of the telephone line is determined based on the data length, and the data is sent to the wireless base station 6 via the telephone line 16.The base station 6 is connected to the telephone line 26.
The data packet is sent to the mobile device 5 via the . Mobile device 5
looks at the mobile device number in the data packet, and if it matches the mobile device number of mobile $15, it sends the data packet to the packet device 3, and the packet device 3 sends a response signal to the data terminal 2.

When the data transmission and reception between the data terminal 2 and the center 10 is completed, the user inputs a disconnection signal from the data terminal 2, and the disconnection signal is sent to the packet device 3, and the packet device 3 subscriber number of center 10,
Mobile device number of mobile device 5.

The disconnection signal is packetized, and the line instruction signal for instructing the use of the control signal line is further packetized and sent to the mobile device 5 as a disconnection request packet. The disconnection request packet is sent to the center 10 in the same manner as the call request packet. The center 10 checks the subscriber number of the data terminal 2 in the received disconnection request packet, and packetizes the subscriber numbers of the data terminal 2 and the center 10 and the destination packet switching center 80 station number in the disconnection request packet. The disconnect confirmation packet is sent to the packet device 3 in the same manner as the response packet.

After receiving the disconnection confirmation packet, the packet device 3 sends a disconnection confirmation signal to the data terminal 2.

Next, we will explain the process of transmitting data from the center 10 to the data terminal 2.

The center 10 packetizes the subscriber number of the center 10 and the subscriber number of the data terminal 2, and sends it to the packet switching center 9 as a call request packet. The packet switching center 9 learns that the data terminal 2 is on the mobile unit 1 from the subscriber number of the data terminal 2 in the call request packet, and further registers the location of the mobile unit 5 to which the data terminal 2 is connected. I learned that the mobile telephone exchange that I am currently working with is Mobile Telephone Exchange 11.
A location request packet for requesting the location of the mobile device 5 to which the subscriber number of the data terminal 2 is added is sent to the packet switching center 12 closest to the mobile telephone switching center 11. The packet switching center 12 sends the location request packet to the mobile telephone switching center 1 via the packet line 23.
Send to 1. The mobile telephone switching center 11 obtains the location and mobile number of the mobile device 5 from the subscriber number of the data terminal 2, and sends it to the packet line 23 as a packetized answer packet.
is sent to the packet switching center 12 via the packet switching center 1.
2 is sent to the packet switching center 9 via the packet line 22.

The packet switching center 9 receives the mobile device 5 in the received reply packet.
The mobile device number and location information (the subscriber number of the data terminal 2 and the station number of the packet switching center 90) are packetized and sent as a call request packet to the packet switching center 8 via the packet line 20.

The packet switching center 8 receives the data terminal 2 in the call request packet.
Knowing that the packet is destined for the mobile telephone exchange 7 from the subscriber number of , it sends a call request packet to the mobile telephone exchange 7 via the packet line 19.

The mobile telephone exchange 7 converts the call request packet into a configuration that can be received by the mobile device 5, determines that the control signal line is to be used since it is a call request packet, and transmits the call request packet to the control signal line 17.
A call request packet is sent to the base station 6 via. The base station 6 sends a call request packet to the mobile device 5 via the control signal line 28. The mobile device 5 sends a call request packet to the packet device 3. After confirming the subscriber number of the center 10 in the call request packet, the packet device 3 confirms the number of the packet switching center 90 that will be the destination packet switching center, and the center 10
It packetizes the subscriber number of the data terminal 2 and sends to the mobile device 5 a response packet containing a line instruction signal instructing the use of the C2 control signal line. Mobile device 5
learns the use of the control signal line from the line instruction signal and sends it to the base station 6 via the control signal line 27, and the base station 6 sends it to the mobile telephone exchange 7 via the control signal line 17. The mobile telephone switching center 7 converts the response packet into a configuration that can be received by the packet switching center 8 and transmits it via the packet line 19 to the packet switching center 8.
Send to. The packet switching center 8 adds the packet switching center 80 station number to the response packet, and sends the response packet to the packet switching center 9 via the packet line 20 based on the packet switching center 90 station number in the response packet. The station 9 sends a response packet to the center 10 based on the subscriber number of the center 10 in the response packet.

Center 10 sends data to data terminal 2, Center 1
The subscriber number 0 and the subscriber number of the data terminal 2 are packetized and sent to the packet switching center 9 as a data packet. The packet switching center 9 learns that the data terminal 2 is on the mobile unit 1 from the subscriber number of the data terminal 2 in the data packet, and further registers the location of the mobile unit 5 to which the C2 data terminal 2 is connected. Knowing that the mobile telephone switching center that is the mobile telephone switching center is the mobile telephone switching center 11, the mobile telephone switching center requests the location of the mobile terminal 5 with the subscriber number of the data terminal 2 added to the packet switching center 12 nearest to the mobile telephone switching center 11. A location request packet is sent to the packet switching center 12 to request the location. Packet switching center 12 sends a location request packet to mobile telephone switching center 11 via packet line 23. The mobile telephone switching center 11 uses the subscriber number of the data terminal 2 to determine the mobile terminal 5.
The location and mobile device number are determined and sent as a packetized answer packet to the packet switching center 12 via the packet line 26, and the packet switching center 12
The packet is sent to the packet switching center 9 via the .

The packet switching center 9 receives the mobile device 5 in the received reply packet.
The data, the subscriber number of the data terminal 2, and the station number of the packet switching center 90 are packetized together with the mobile device number and location information of the data terminal 2, and sent as data packets to the packet switching center 8 via the packet line 20.

The packet switching center 8 knows from the subscriber number of the data terminal 2 in the data packet that the packet is destined for the mobile telephone switching center, and sends the data packet to the mobile telephone switching center 7 via the packet line 19.

The mobile telephone switching center 7 converts the data packet into a configuration that can be received by the mobile device 5, determines the use of the telephone line from the data length in the data packet, and sends the data packet to the base station 6 via the telephone line 16. The base station 6 sends data packets to the mobile device 5 via the communication line 26. Mobile device 5 sends data packets to packet device 6 . Packet device 3 sends data to data terminal 2.

When the user inputs data from the data terminal 2, the packet device 3 receives the data, packetizes the data, the subscriber numbers of the center 10 and the data terminal 2, and the mobile device number of the mobile device 5, and further converts the data into packets based on the data length. A line instruction signal instructing the use of a telephone line is packetized and sent to the mobile device 5 as a data packet.

The mobile device 5 learns the usage of the call line from the line instruction signal and sends it to the base station 6 via the call line 25. The base station 6 sends the signal to the mobile telephone switching center 7 via the telephone line 16.

Mobile telephone switching center 7 transfers data packets to packet switching center 8
The data packet is converted into a configuration that can receive data packets, and the data packet is sent to the packet switching center 8 via the packet line 19. The packet switching center 8 adds the station number of the packet switching center 8 and sends the data packet to the packet switching center 9 via the packet line 20 based on the station number of the packet switching center 9 in the data packet. A data packet' is sent to the center 10 based on the subscriber number of the center 10 in the data packet.

When data transmission and reception between the center 10 and the data terminal 2 is completed, the center 10 sends a disconnection request packet to which the subscriber numbers of the center 10 and the data terminal 2 are added to the packet switching center 9. The packet switching center 9 sends a disconnection request packet to the mobile device 5 in the same manner as when sending the call request packet. The mobile device 5 sends the disconnection request packet to the packet device 3.
Send to.

The packet device 6 confirms the subscriber number of the center 1o in the disconnection request packet, sends a disconnection signal to the data terminal 2, and also checks the subscriber numbers of the center 1o and the data terminal 2 and the subscriber number of the center 1o in the disconnection request packet (two destinations). Side packet switching center 9
The 0 station number is packetized and sent as a disconnection confirmation packet to the center 10 in the same manner as the response packet.

Although not mentioned in the above explanation, the call request and data packets and the disconnection request and data packets are each made into the same packet, and a disconnection packet is added, and 2 data are sent and received in 6 packets (
first centering), if there are three or more packet switching centers between the mobile telephone switching center 7 and the center 1o, or if the mobile telephone switching center 7 and the mobile telephone center 11 are the same, the mobile station 5 After sending the packet, in any case, such as when the mobile unit 1 moves to another mobile telephone exchange area (2), a mobile telephone that manages the area where the mobile unit 1 is located using a packet network or a common signal line. Exchange center Hecenter 10
The packet is transferred from the mobile telephone switching center to the data terminal 1 (via the mobile device 5 and the packet device 4).
It is possible to transfer two.

Furthermore, when the packet switching center 9 accesses the location information of the mobile device 5, it is also possible to directly access the mobile telephone switching center 9 through a common signal line (two-way access).

In addition, in order to receive packets transmitted from a mobile device at the packet switching center and packets transmitted from the packet switching center at the mobile device (2. It is also possible to use a local or packet switching center constituting a mobile telephone system, such as a central office.

Next, among the several cases described above, the operation when the mobile unit 1 moves to another area (2) during packet communication will be explained from Figure 2:2.

The same reference numerals as in FIG. 1 indicate the same parts. 29 is another mobile telephone switching center, 30 is a common signal line, and 31 is a base station including the mobile telephone switching center 29.

For example, as shown in FIG. 2, after the mobile device 5 sends a call request packet, but before receiving the response packet, the mobile device 1 moves from the area of the mobile telephone exchange 7 to the area C2 of the mobile telephone exchange 24. In this case, the mobile telephone exchange 7 that received the response packet sends the subscriber number of the data terminal 2 in the response packet to the mobile telephone exchange 11 via the common signal line 18, and the mobile telephone exchange 11 sends the subscriber number of the data terminal 2 in the response packet to the mobile telephone exchange 11. Based on the subscriber number, the mobile device 5
Mobile telephone exchange 7 obtains the mobile number and location area of
The signal is sent to the common signal line 18.

The mobile telephone exchange 7 learns from the location area information that the mobile body 1 is within the area of the mobile telephone exchange 29 and sends a response packet to the mobile telephone exchange 29 via the common signal line 30.

The mobile telephone switching center 29 sends a response packet to the mobile station 5 using the method described in the text (2).

Details of the invention As explained above, the present invention has the following effects.

(1) Since data communications generally involve sending and receiving small amounts of data, wireless channels can be used more effectively than circuit switching methods.

(2) Since both the control signal line and the speech line can send and receive packets, when the control signal line or the speech line are used individually (compared to the second one, if the data length is short or the packets are small, the control By sending and receiving packets using a signal line, all communication lines are used for telephone use (= used) to eliminate the effect on calls, and in the case of long packets or large amounts of data, the communication line is temporarily used. By transmitting and receiving data packets (C2), the available lines can be used efficiently, as more data can be processed.

[Brief explanation of drawings]

FIG. 1 is a relay system diagram showing an embodiment of the present invention, and FIG. 2 is a diagram illustrating an example in which the present invention is applied when a mobile body moves to another area during packet communication. ... Mobile object, 2 ... Data terminal, 6 ... Packet device, 4 ... Telephone, 5 ... Mobile device, 6 ... Wireless base station, 7 ... Mobile telephone switching center, 8... Packet switching center, 9... Packet switching center, 10... Center,
11... Mobile, telephone switching center, 12... Packet switching center, 16... Call line, 17... Control signal line, 1
8... Common signal line, 19... Packet line, 20
...Packet line, 21...Packet line, 22.
...Packet line, 23...Packet line, 25...
- Wireless communication line from mobile device 5 to wireless base station 6, 26
. . . Wireless communication line from the wireless base station 6 to the mobile device 5,
27... Radio control signal line from mobile device 5 to radio base station 6, 28... Radio control signal line from radio base station 6 to mobile device 5, 29... Other mobile telephone exchange , 30
... Common signal line, 31 ... Base station patent applicant Representative of Nippon Telegraph and Telephone Public Corporation Patent attorney Gobe Tamamushi (6 others)

Claims (1)

[Scope of Claims] 1. A mobile device mounted on a mobile object such as a car and used for making calls: 1) A mobile device to be used, a mobile telephone switching center that controls the call connection, and a mobile device that wirelessly transmits and receives control signals and calls to and from the mobile device. , a base station that transmits and receives control signals and calls to and from the mobile telephone switching center by wire, a wireless call line that connects the mobile device and the base station, and a control signal line for setting the call line; A mobile telephone system consisting of a speech line and a control signal line connecting the base station and the mobile telephone exchange (2, the mobile body is equipped with the mobile station 1, a data terminal, and a packet device, Data terminal and the packet device.When the packet device and the mobile device are connected to each other and packetized data is transmitted from the mobile device, the data input from the data terminal is packetized by the packet device, and The packet device identifies the length of the input data, and the mobile device selects either the control signal line or the speech line based on the length of the packetized packet corresponding to the identified data length. It is used for transmitting and receiving packets and transmitted to the mobile telephone switching center via the base station, and the mobile telephone switching center converts the received packets to a configuration suitable for packet network C2. The packet is further transmitted to a data terminal or center connected to the packet network C, while the packet network C is
= When transmitting packetized data from a connected data terminal or center, etc., the packet is sent to the mobile telephone switching center via the packet network, and the mobile telephone switching center transmits the packet to the mobile telephone switching center. converts the packet structure that the device can receive, determines which of the control signal line and speech line to use from the data length in the packet,
The judgment (=Based on the control signal V and the communication line, the packet is transmitted to the mobile device via the base station, the mobile device transmits it to the packet device, and the packet is transmitted to the packet device. A mobile communication system characterized in that a device converts the packet into a format that can be received by the data terminal and sends it to the data terminal.