JP2002238074A - Mobile communications system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of the conventional mobile communications system of being unable to have revised a transmission rate of communication data to a transmission rate in matching with a data quantity, even if the data quantity fluctuates accompanying the lapse of time, after the transmission rate of the communication data has been set once. SOLUTION: In the mobile communications system provided with mobile stations belonging to a wireless coverage area, base stations mutually exchanging control information required for radio communication through a control channel with the mobile stations and mobile switch stations that receive control information required for data communication from a communication unit connected to a public communication network, receive control information sent from the mobile station via the base station and set a transmission rate of communication data sent/received between the mobile station and the communication unit, on the basis of both the control information items; and the mobile switch station registers a transmission rate which the mobile station can handle, when the mobile station makes position registration and registers a transmission rate switching time of the mobile station.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication for setting an asymmetric data communication channel in which the transmission speed of communication data transmitted from a mobile station to a base station is different from the transmission speed of communication data transmitted from the base station to the mobile station. It is about the system.

[0002]

2. Description of the Related Art FIG.
FIG. 1 is a configuration diagram showing a conventional mobile communication system disclosed in Japanese Patent Application Publication No. H10-207, in which reference numeral 1 denotes a mobile station mounted on a movable vehicle or the like, and 2 denotes communication data having a low transmission speed to a base station 5. 3 is a high-speed receiving means for receiving communication data having a high transmission rate from the base station 5, 4 is an uplink line of a data communication channel, 5 is a base station which performs wireless communication with the mobile station 1 belonging to the wireless coverage area. , 6 are low-speed receiving means for receiving low-speed communication data from the mobile station 1, 7 are high-speed transmitting means for transmitting high-speed communication data to the mobile station 1, and 8 is a downlink of a data communication channel. is there.

Next, the operation will be described. For example, when the mobile station 1 needs to transmit communication data to a communication device (not shown) connected to the public communication network, the mobile station 1 receives the control channel of the base station 5 and is assigned to the mobile station 1. Place a call through the control channel.

[0004] That is, the mobile station 1 transmits control information necessary for wireless communication through a control channel (for example, when transmitting communication data to the base station 5, the mobile station 1 transmits at a low transmission rate. When data is received, the base station 5 transmits information indicating that high-speed communication data is received).

When the control information is transmitted from the mobile station 1, the base station 5 transfers the control information transmitted from the mobile station 1 to a mobile switching center or the like (not shown). If the request is accepted, the base station 5 notifies the user via the control channel that the request is accepted.

As a result, the transmission speed of communication data transmitted from the mobile station 1 to the base station 5 is set to a low transmission speed, and the transmission speed of communication data transmitted from the base station 5 to the mobile station 1 is set to a high transmission speed. , And asymmetric wireless communication with different transmission speeds between the uplink 4 and the downlink 8 is realized.

[0007]

Since the conventional mobile communication system is configured as described above, it is possible to realize asymmetric wireless communication in which the transmission speeds of the uplink 4 and the downlink 8 are different from each other. Once the transmission rate of communication data is set, since means for changing the transmission rate of communication data are not provided thereafter, even if the data amount fluctuates with the passage of time, the data amount matches the data amount. There was a problem that the transmission speed could not be changed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem. A mobile communication system capable of appropriately changing the communication data transmission rate after the communication data transmission rate is once set. The purpose is to gain.

[0009]

A mobile communication system according to the present invention is connected to a base station for exchanging control information necessary for wireless communication with a mobile station belonging to a radio coverage area through a control channel, and to a public communication network. Receiving control information necessary for data communication from the communication device, receiving control information transmitted from the mobile station through the base station, and transmitting and receiving between the mobile station and the communication device based on both control information. In a mobile communication system including a mobile switching center that sets a transmission rate of communication data, the mobile switching center registers a transmission rate that can be handled by the mobile station when the mobile station performs location registration, The speed switching time of the mobile station is registered.

In the mobile communication system according to the present invention, a mobile switching center is provided with an information memory for storing a transmission rate that can be handled by a mobile station and for storing a speed switching time of the mobile station.

In the mobile communication system according to the present invention, when the mobile station and the communication device start transmitting communication data, the maximum data communication channel can accept within a transmission rate that can be handled by the mobile station. The transmission rate is selected by the mobile switching center, and transmission rate information indicating the transmission rate is notified to the base station and the mobile station.

In the mobile communication system according to the present invention, when the mobile switching center notifies the base station and the mobile station of the transmission rate information and the mobile station speed switching time stored in the information memory elapses, the transmission rate switching is performed. Is transmitted to the base station and the mobile station.

[0013] In the mobile communication system according to the present invention, when the base station and the mobile station receive the notification of the switching timing information from the mobile switching center, the new transmission starts from the time slot in the first frame after receiving the notification. The transmission / reception of communication data is started at a speed.

[0014] In the mobile communication system according to the present invention, when the mobile station detects that the moving speed exceeds the range of the walking speed when the moving speed is within the range of the walking speed,
This is to notify the mobile switching center of the vehicle traveling speed information indicating the fact through the base station.

[0015] In the mobile communication system according to the present invention, when the mobile station detects that the traveling speed is below the range of the vehicle traveling speed when the traveling speed is within the range of the traveling speed of the vehicle, it indicates so. It notifies the mobile switching center of the vehicle traveling speed release information through the base station.

In the mobile communication system according to the present invention, when vehicle traveling speed information is notified from a mobile station via a base station, an information memory for storing the vehicle traveling speed information is provided in a mobile switching center.

In the mobile communication system according to the present invention, when the traveling speed release information is notified from the mobile station via the base station, the mobile switching center is provided with an information memory for storing the traveling speed release information. .

In the mobile communication system according to the present invention, when the vehicle speed information is stored in the information memory, the system setting processor that changes the time slot so that the guard time of the data communication channel matches the vehicle speed is moved. It is provided in the exchange.

In the mobile communication system according to the present invention, when the vehicle running speed release information is stored in the information memory, the system setting processor that changes the time slot so that the guard time of the data communication channel matches the walking speed is moved. It is provided in the exchange.

A mobile communication system according to the present invention includes a base station for exchanging control information required for wireless communication with a mobile station belonging to a wireless coverage area through a control channel, and a data communication from a communication device connected to a public communication network. And the control information transmitted from the mobile station through the base station, and based on both control information, the transmission rate of communication data transmitted and received between the mobile station and the communication device. In a mobile communication system including a mobile switching center to be set, when communication data is transmitted from a communication device to a mobile station, the communication device notifies the mobile switching center of the data amount of the communication data.

A mobile communication system according to the present invention includes a base station for exchanging control information necessary for wireless communication with a mobile station belonging to a wireless coverage area through a control channel, and a data communication from a communication device connected to a public communication network. And the control information transmitted from the mobile station through the base station, and based on both control information, the transmission rate of communication data transmitted and received between the mobile station and the communication device. In a mobile communication system including a mobile switching center to be set, when transmitting communication data from the mobile station to the communication device, the mobile station notifies the mobile switching center of the data amount of the communication data.

A mobile communication system according to the present invention includes a base station for exchanging control information necessary for wireless communication with a mobile station belonging to a wireless coverage area through a control channel, and a data communication from a communication device connected to a public communication network. And the control information transmitted from the mobile station through the base station, and based on both control information, the transmission rate of communication data transmitted and received between the mobile station and the communication device. In a mobile communication system including a mobile switching center to be set, when communication data is transmitted from a communication device or a mobile station to another communication device or another mobile station, the communication device or the mobile station that transmits the communication data transmits the communication data. Is notified to the mobile switching center.

In the mobile communication system according to the present invention, the mobile switching center determines the maximum transmission rate that can be actually transmitted from the maximum transmission rate that can be implemented by the mobile station and the status of the current idle data communication channel. When transmission of communication data is started at the transmission speed, it is determined whether or not the data amount notified from the communication device can be transmitted within a predetermined time, and if it is determined that transmission cannot be performed within a predetermined time,
The transmission of communication data is rejected.

In the mobile communication system according to the present invention, the mobile switching center determines the maximum transmission rate that can be actually transmitted from the maximum transmission rate that can be implemented by the mobile station and the status of the current idle data communication channel. When the transmission of communication data is started at the maximum transmission rate, it is determined whether or not the data amount notified from the mobile station can be transmitted within a certain time, and if it is determined that the data amount cannot be transmitted within a certain time, ,
The transmission of communication data is rejected.

In the mobile communication system according to the present invention, the mobile switching center determines the maximum transmission rate that can be actually transmitted from the maximum transmission rate that can be implemented by the mobile station and the status of the current idle data communication channel. When the transmission of communication data is started at the maximum transmission speed, it is determined whether or not the amount of data notified from the communication device or mobile station transmitting the communication data can be transmitted within a certain time, and within a certain time, If it is determined that transmission cannot be performed, transmission of communication data is rejected.

A mobile communication system according to the present invention includes a base station for exchanging control information required for wireless communication with a mobile station belonging to a wireless coverage area through a control channel, and a data communication from a communication device connected to a public communication network. And the control information transmitted from the mobile station through the base station, and based on both control information, the transmission rate of communication data transmitted and received between the mobile station and the communication device. In a mobile communication system including a mobile switching center to be set, when performing a handover of the mobile station, the mobile switching center determines whether or not the mobile station and the base station are to be switched according to the state of an available data communication channel of the switching destination base station. This is to change the transmission speed between them.

In the mobile communication system according to the present invention, the mobile switching center determines the switching destination base station before performing the handover of the mobile station, and determines the status of the free data communication channel of the switching destination base station. Is what you do.

The mobile communication system according to the present invention detects the electric field strength of radio waves transmitted from all base stations adjacent to the base station to which the mobile station is currently connected, and reports the electric field strength to the mobile switching center. Things.

In the mobile communication system according to the present invention, when the mobile station receives an instruction from the mobile switching center, it reports the electric field strength to the mobile switching center.

In the mobile communication system according to the present invention, when the mobile station receives an instruction from the base station, it reports the electric field strength to the mobile switching center.

In the mobile communication system according to the present invention, the mobile switching center compares the electric field strengths of the radio waves transmitted from the respective base stations with each other, and determines the base station that has transmitted the radio wave with the highest electric field strength as the switching destination base station. To decide.

[0032] In the mobile communication system according to the present invention, the mobile switching center is capable of realizing the maximum transmission rate within the range of the maximum transmission rate achievable by the mobile station among the available data communication channels of the base station to which the mobile switching center switches. A communication channel is selected.

[0033] In the mobile communication system according to the present invention, when the mobile exchange performs the handover of the mobile station and the transmission speed increases, the mobile exchange performs the handover before changing the transmission speed.

[0034] In the mobile communication system according to the present invention, when the mobile exchange performs the handover of the mobile station and the transmission speed becomes slow, the mobile exchange performs the handover after changing the transmission speed.

[0035]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a configuration diagram showing a mobile communication system according to Embodiment 1 of the present invention. In the figure, 11
Is a database (communication device) connected to the public communication network 12, and 12 is a public service network (Public Service).
e Telephone Network: PST
N), 13, 14, and 15 are exchanges belonging to the PSTN 12, and 16 to 22 are communication devices mounted on automobiles or the like, portable communication devices, or semi-fixed WLLs (Wireless).
(Local Loop) station, and these communication devices and the like are hereinafter referred to as mobile stations. 23 to 26 are base stations for exchanging control information necessary for wireless communication with the mobile station 16 and the like belonging to the radio coverage area through a control channel, and transmitting and receiving communication data including voice data and image data through a data communication channel. , 23a are the radio coverage of the base station 23, 24a is the radio coverage of the base station 24, 25a is the radio coverage of the base station 25, 26a is the radio coverage of the base station 26, 2
7, 28 and 29 receive control information necessary for data communication from the database 11 connected to the PSTN 12, and transmit control information transmitted from the mobile station 16 or the like to the base station 2.
3 is a mobile switching center that sets the transmission speed of communication data transmitted and received between the mobile station 16 or the like and the database 11 based on both control information.

Next, the operation will be described. First, the subscriber number, user ID, billing,
Authentication and the like are control information that does not depend on the characteristics of the communication medium. On the other hand, the allowable transmission speed and the speed switching time of the user terminal (the mobile station 16 and the database 11 and the like) greatly differ depending on the settings of each user terminal and the system. Hereinafter, in this specification, the former will not be particularly described, and the handling of the transmission speed and the like depending on the characteristics of the communication medium will be described in detail.

First, the mobile switching center 27 and the like for controlling the base station 23 and the like are connected by wire to the PSTN 12 as shown in FIG. 1, but the mobile station 16 and the base station 23 and the like use a digital modulation method. A control signal and the like are transmitted and received using a modulation method, and a frequency division multiplexing access / time division two-way communication method (Frequency Division Multi) is used.
ple Access / Time Division
Duplex: FDMA / TDD system, code division multiple access / time division two-way communication system (CodeDivis)
ion Multiple Access / Time
Division Duplex: CDMA / TDD system, Multi-carrier time-division multiplex access, frequency-division bidirectional communication system (Multi-Carriers T)
imDivision Multiple Access
ss / FrequencyDivision Dupl
ex: TDMA / FDD system), TDMA / TDD system, time division CDMA / FDD system or time division CDMA /
Wireless connection is made by the TDD method or the like.

FIG. 2 shows a PC using time division CDMA.
S (Personal Communication)
FIG. 2 is a diagram illustrating a configuration of a time slot for a System and a cellular. In the figure, # 41-0-3 are PCs
Time slot for S, # 47-T1 / R1, T
2 / R2 is a time slot for cellular.

Time slots # 44-T0 / R0 for TDMA medium speed data communication and time slots # 51-T0 / R0, T1 / R1,
T2 / R2, T3, T7A, and time slot # 52-T7C for time division CDMA high-speed data communication are shown. However, other low-speed TDMA time slots (*
(Marked) indicates an example used as audio data, low-speed data, or a control channel.

In FIG. 2, the downlink time slots are five slots T0, T1, T2, T3 and T7, while the uplink time slots are R0, R1 and R2.
These three slots constitute an asymmetric time-division bidirectional communication system (TDD system).

Next, the state transition of the radio channel between the mobile station 16 and the like and the base station 23 and the like will be described with reference to the state transition diagram of FIG. 3 and the flowchart of FIG. When there are a plurality of mobile stations, the same state transition diagram as in FIG. 3 exists for the number of the mobile stations, but here, for convenience of explanation, the state transition between the mobile station 16 and the base station 23 will be described.) .

First, when the mobile station 16 originates a call, in the state J1, the mobile station 16 receives the control channel transmitted by the base station 23, and sets the time in the control channel allocated to the mobile station 16 to the time. A wireless connection is requested through the slot (step ST1).

When a request for a wireless connection is transmitted from the mobile station 16, the mobile switching center 27 receives the request for a wireless connection via the base station 23 and judges the quality of the wireless connection. A communication channel is set between the base station and the base station 23 (step ST2).

On the other hand, when the base station 23 makes a call (a call from the base station 23 is a call associated with a call from the database 11), in state J1, the base station 23 Is used to transmit the telephone number of the designated mobile station 16 from the database 11 (step S).
T3).

When the mobile station 16 having received the telephone number of the own station responds to the base station 23 through the designated control channel, the mobile switching station 27 transmits the communication channel or the communication channel between the mobile station 16 and the base station 23. A low-speed data channel is set (step ST4).

However, the mobile switching center 27 receives control information necessary for wireless communication from the mobile station 16 through the control channel when setting the communication channel. For example, mobile station 1
6 receives information such as the transmission speed that can be handled.

When a communication channel is set between the mobile station 16 and the base station 23, the online operator of the PSTN 12 transmits the FACCH (Fast Ac) of the communication channel.
The mobile station 16 receives the mobile station ID from the mobile station 16 through the access control channel (step ST5).

When the mobile station 16 is authenticated by the PSTN 12 online operator, the mobile switching center 27
Sets a data communication channel between the mobile station 16 and the base station 23 (steps ST6 and ST7), and changes from state J1 to state J.
Transition to 2.

Thus, the mobile station 16 and the database 1
Transmission / reception of communication data between the mobile stations 16 is started, but first, preliminary communication for confirming whether or not the mobile station 16 has the ability of the database 11 to process the communication data is started.

In the case of such preliminary communication, since the amount of communication data transmitted is small, the uplink (a transmission path for transmitting communication data from the mobile station 16 to the database 11) and the downlink (communication from the database 11 to the mobile station 16). The transmission speed of the data transmission path) is normally set in the range of low-speed data transmission (less than 19.6 Kbps).

However, the transmission paths of the uplink and the downlink are both set within the range of low-speed data transmission, but the transmission rates of the uplink and the downlink do not always match. For example, the transmission rate of the uplink is 8 Kbps. Is set. On the other hand, the transmission speed of the downlink may be set to 2 Kbps (asymmetric wireless communication setting).

When high-speed data transmission or medium-speed data transmission is necessary from the beginning, the range of high-speed data transmission (200 Kbps or more) or the range of medium-speed data transmission (1
The transmission speed may be set at 9.6 Kbps or more and less than 200 Kbps).

Thus, the mobile station 16 and the base station 23
The transmission speed of the data communication channel for wireless connection is set, and transmission / reception of communication data is started, but the data amount of the communication data is not always constant, and the data amount may fluctuate over time, At the initially set transmission speed, there may be a problem that communication data cannot be transmitted in a short time.

Therefore, in the first embodiment, once the transmission rate of the communication data is set, and if there is a request from the mobile station 16 or the database 11 regarding the change of the transmission rate, the mobile switching station 27 will switch the mobile station 16 The transmission speed of the uplink and the transmission speed of the downlink are separately and independently changed in consideration of the transmission speed that can be handled by the communication device and the current state of the available data communication channel.

Note that J3 to J8 indicate states in which the mobile switching center 27 has changed the transmission speed of the uplink and downlink in response to a request from the mobile station 16 or the database 11, but the intermittent transmission in J6 to J8. Data transmission means mobile station 1
6 is a data transmission in which a wireless connection between the base station 23 and the base station 23 is maintained, but there is a time zone during which communication data is not transmitted. If such a state transition to intermittent data transmission is recognized, if the connection fee is charged only at the time of transmitting the communication data, there is an advantage that the communication fee can be reduced, and the time period during which the communication data is not transmitted can be obtained. Thus, there is an effect that the base station 23 can release the data communication channel.

As described above, according to the first embodiment, in response to a request from the mobile station 16 or the like or the database 11, the mobile switching center 27 transmits the communication data or the database transmitted from the mobile station 16 or the like to the database 11. Since the transmission speed of the communication data transmitted from the mobile station 16 to the mobile station 16 is separately changed, the communication data transmitted from the mobile station 16 or the like to the database 11 is once set. Even if the data amount of the communication data to be transmitted from the database 11 to the mobile station 16 or the like fluctuates, the transmission speed can be changed to a transmission speed appropriate for the data amount. Therefore, there is also an effect that a multimedia-like wireless environment can be created.

Embodiment 2 FIG. 5 is a block diagram showing the details of the mobile switching center of the mobile communication system according to the second embodiment of the present invention. In the figure, reference numeral 31 denotes a PSTN interface, 32 denotes a communication path switching unit, and 33 performs high-speed data transmission. A memory device for high-speed data functioning as a buffer for communication data, a data number management processor,
A mobile station information memory 35 stores a transmission rate that can be handled by the mobile station 16 and the like and also stores a speed switching time of the mobile station 16 and the like.
Reference numeral 5 also stores vehicle traveling speed information, vehicle traveling speed release information, and the like.

When there are a plurality of mobile stations transmitting and receiving communication data via the base station 23 or the like, a transition state control processor 36 manages a state transition of the transmission speed for each mobile station, and a mobile station 37 is a mobile station. A priority control processor that manages the setting of a data communication channel by the exchange 27, the authentication of the mobile station 16 and the like by the network operator, and the change of the transmission rate by the mobile exchange 27;
When the transmission speed change request is output, the transmission speed is changed, and when the vehicle traveling speed information or the vehicle traveling speed release information is stored in the mobile station information memory 35, the guard time of the data communication channel is changed. A scheme setting processor for changing the time slot to match the speed of the station 16 or the like, 39 is a signaling processor, and 40 is a base station interface. In FIG. 5, the mobile switching center 2
7, the configuration of the mobile switching centers 28 and 29 is the same.

Next, the operation will be described. Although the configuration of the mobile switching center 27 and the like are not particularly mentioned in the first embodiment, the mobile switching center 27 and the like are configured as shown in FIG. In the speed change process, as shown in FIG. 6, the mobile switching center and the base station serve as a window for receiving a transmission speed change request from the mobile station 16 or the like or the database 11, and the mobile switching center 27 or the like performs the data rate change process. Take charge of control.

Among the mobile switching centers 27 and the like,
The system setting processor 38 executes a process of receiving a request for changing the transmission speed, and sets the transmission speed of the communication data so that the transmission speed matches the requested speed.

It is to be noted that the database 11 stores a large amount of data such as geology and crust as in the case of, for example, the Geophysical Laboratory, and has a function of transmitting the large amount of data and a large amount of data. When the database 11 has a function of receiving data, the database 11 may transmit and receive a large amount of data with the mobile station 16 and the like.

However, when transmitting a large amount of data, if a large amount of data is simply transmitted without managing the transmission speed and the like,
The transmission capability of the mobile station 16 or the database 11 or the database 11 may not be sufficiently exhibited, which may cause a problem that the data transmission time becomes longer than necessary.

Accordingly, in such a case, the mobile switching center accepts the request for changing the transmission rate from the mobile station or the database 11 and changes the transmission rate, so that the transmission capability of the mobile station or the database 11 is fully exhibited. The effect that can be achieved.

Embodiment 3 FIG. 7 is a transmission flowchart showing a mobile communication system according to Embodiment 3 of the present invention. FIG. 8 shows a mobile station information memory 3 storing a transmission speed and a speed switching time which can be handled by each mobile station.
5 is a table showing the contents of FIG.

Next, the operation will be described. First, when the mobile station 16 enters the radio coverage area 23a of the base station 23 (in the third embodiment, the mobile station 16 will be described as an example), the mobile station 16 issues a location registration request through the control channel to the base station. 23 (P1).

When the base station 23 receives the location registration request from the mobile station 16, it performs the location registration of the mobile station 16 and transmits the location registration request to the mobile switching center 27 (P1).

When the mobile switching center 27 receives the location registration request from the base station 23, it requests a report of information indicating a transmission rate (hereinafter, referred to as a “transmission rate”) that can be handled by the mobile station and a speed switching time. Is transmitted to the mobile station 16 via the base station 23 (P2).

As a result, when the mobile station 16 transmits the transmission rate and the speed switching time to the mobile switching center 27 via the base station 23 (P3), the mobile switching station 27 transmits the transmission rate and the speed switching time to the mobile switching station 27. The speed switching time is stored in the mobile station information memory 35, and the transmission rate and the like of the mobile station 16 are registered (see FIG. 8).

In the state where the transmission rate and the like of the mobile station 16 are registered, the database 11 or the mobile station 16 makes a call (the call includes information indicating the transmission speed required by the calling side). ), (P4, P5), the mobile switching center 27 selects the transmission rate required by the calling side from the transmission rates stored in the mobile station information memory 35, and transmits the information on the transmission rate to the base station 23. And mobile station 16
(P6, P7).

When the mobile switching center 27 notifies the base station 23 and the mobile station 16 of the information on the transmission rate, the mobile switching center 27 counts the time from the time of the notification and stores the time in the mobile station information memory 35. When the set speed switching time is reached, the switching timing information is notified to the base station 23 and the mobile station 16 (P9, P10). Although the mobile switching center 27 counts the time and notifies the switching timing information here, the base station 23 counts the time according to the instruction of the mobile switching station 27, and switches the switching timing information to the mobile station 16. May be notified.

When the switching timing information is notified from the mobile switching center 27, the base station 23 and the mobile station 16
Transmission / reception of communication data is started at a transmission rate according to the transmission rate information notified earlier (P11, P12).

In this way, transmission / reception of communication data is started.
Alternatively, when a transmission rate change request is transmitted from the mobile station 16 (P13, P14), a transmission rate corresponding to the change request is selected from the transmission rates stored in the mobile station information memory 35, and the transmission rate is selected. The rate information is notified to the base station 23 and the mobile station 16 (P15, P16).

When the mobile switching center 27 notifies the base station 23 and the mobile station 16 of the information of the transmission rate, the mobile switching center 27 counts the time from the time of the notification and stores the time in the mobile station information memory 35. When the set speed switching time is reached, the switching timing information is notified to the base station 23 and the mobile station 16 (P18, P19).

When the switching timing information is notified from the mobile switching center 27, the base station 23 and the mobile station 16
Transmission / reception of communication data is restarted at a new transmission rate from the time slot in the first frame after receiving the notification (P20, P21).

In this way, the transmission speed of communication data is changed. When a request to change the TDMA guard time is transmitted from the mobile station 16 in accordance with the change in the transmission speed, the mobile switching center 27 Information indicating the new guard time is notified to the base station 23 and the mobile station 16 (P23, P2
4).

When the mobile switching center 27 notifies the base station 23 and the mobile station 16 of the information indicating the new guard time, the mobile switching center 27 counts the time from the time of the notification, and the time is designated by the mobile station 16. When the time arrives, the switching timing information is notified to the base station 23 and the mobile station 16 (P26, P27).

When the switching timing information is notified from the mobile switching center 27, the base station 23 and the mobile station 16
Transmission / reception of communication data is restarted using the new guard time (P28, P29).

As described above, according to the third embodiment, when the mobile station 16 performs location registration, the mobile switching center 27
Is configured to register the transmission rate of the mobile station 16 and the speed switching time of the mobile station 16, so that the mobile switching center 27 can promptly change the transmission rate or guard time of the communication data as necessary. An effect that can be changed is provided.

In the third embodiment, the TDMA guard time is changed according to the change of the transmission speed. Specifically, the moving speed is within the range of the walking speed (for example, 4 km / h). ), When it is detected that the moving speed has exceeded the walking speed range,
A request for changing the guard time by notifying the mobile switching center via the base station of the vehicle traveling speed information indicating that, or a case where the traveling speed is within the range of the vehicle traveling speed (for example, 4 km / h or more) When it is detected that the traveling speed has fallen below the range of the traveling speed of the vehicle, a request to change the guard time may be issued by notifying the traveling mobile station of the traveling speed release information indicating the fact to the mobile switching center through the base station. is there.

The vehicle traveling speed information and the vehicle traveling speed release information are stored in the mobile station information memory 3 of the mobile switching center 27.
When the mobile station information memory 35 stores the vehicle traveling speed information and the vehicle traveling speed release information, the system setting processor 38 determines that the guard time of the data communication channel matches the walking speed or the vehicle traveling speed. Change the time slot as follows.

Embodiment 4 FIG. 9 is a transmission flowchart showing a mobile communication system according to Embodiment 4 of the present invention.

Next, the operation will be described. First, when the mobile station 16 requests a data transmission request, a data communication channel is set between the mobile station 16 and the base station 23 as in Embodiment 1 and the like, and transmission / reception of communication data is started. (Even in the fourth embodiment, the mobile station 16 will be described as an example).

However, in the fourth embodiment, mobile station 1
6 requests the database 11 to transmit data (P
31), the database 11 notifies the mobile switching center 27 of the data amount of the communication data, and requests the mobile switching center 27 to provide information on the maximum transmission speed that can be implemented by the mobile station 16 (P32).

The mobile switching center 27 determines that the maximum possible transmission rate is determined by the transmission performance of the mobile station 16 and the status of the current free data communication channel. While referring to the transmission rate, the current state of the free data communication channel is checked, and the maximum transmission rate that can be actually transmitted is determined.

When the mobile switching center 27 starts transmission of communication data at the maximum transmission rate that can be actually transmitted, the mobile switching center 27 determines whether or not the data amount notified from the database 11 can be transmitted within a predetermined time. If it is determined that the transmission cannot be performed within a certain time, the transmission of the communication data is rejected, and the fact is notified to the mobile station 16 and the database 11.

On the other hand, when it is determined that transmission is possible within a certain time, information indicating the maximum transmission speed is notified to the database 11, the base station 23 and the mobile station 16 (P3).
3, P34, P35).

Then, when the mobile station 16 notifies the mobile switching center 27 and the database 11 of an ACK signal that acknowledges the change to the maximum transmission rate (P36, P37),
The mobile switching center 27 executes a process of switching the transmission speed of communication data in the same manner as in the third embodiment (P3
8).

When the mobile switching center 27 switches the transmission speed of the communication data, the database 11 transmits the communication data to the mobile station 16 at the transmission speed (P39).

Next, when the mobile station 16 transmits a large amount of data to the database 11, the mobile station 16 transmits a data transmission request including the amount of communication data to the mobile switching center 27 and the database 11 (P40, P41).

The mobile switching center 27 refers to the transmission rate of the mobile station 16 stored in the mobile station information memory 35, checks the current state of the free data communication channel, and determines Determine the transmission speed.

When the mobile switching center 27 starts transmission of communication data at the maximum transmission rate that can be actually transmitted, the mobile switching center 27 determines whether or not the data amount notified from the mobile station 16 can be transmitted within a predetermined time. If it is determined that the transmission cannot be performed within a predetermined time, the transmission of the communication data is rejected, and the fact is notified to the mobile station 16 and the database 11.

On the other hand, when it is determined that transmission is possible within a certain time, information indicating the maximum transmission speed is notified to the database 11, the base station 23 and the mobile station 16 (P4).
2, P43, P44).

Then, an ACK signal from the database 11 acknowledging the change to the maximum transmission rate is sent to the mobile switching center 2.
7 and the mobile station 16 (P45, P46),
The mobile switching center 27 executes a process of switching the transmission speed of communication data in the same manner as in the third embodiment (P4).
7).

When the mobile switching center 27 switches the transmission speed of the communication data, the mobile station 16 transmits the communication data to the database 11 at the transmission speed (P48).

As described above, according to the fourth embodiment, when communication data is transmitted from database 11 or the like to mobile station 16 or the like, database 11 or the like notifies mobile switching center 27 of the amount of communication data. As a result, the mobile switching center 27 can grasp the amount of communication data. As a result, when the database 11 or the like transmits a large amount of communication data, the mobile station 16 or the like transmits a large amount of communication data. There is an effect that it can be determined whether or not reception can be performed reliably.

When the transmission of communication data is started at the maximum transmission speed, it is determined whether or not the amount of data notified from the database 11 or the like can be transmitted within a certain period of time. If you decide
Since the transmission of the communication data is rejected, there is also an effect that the reception error of the communication data can be avoided.

In the fourth embodiment, the database 1
1 shows a case where communication data is transmitted from the mobile station 16 to the mobile station 16 and a case where communication data is transmitted from the mobile station 16 to the database 11. May be applied to a case where communication data is transmitted from a mobile station to another mobile station, and a similar effect can be obtained.

Embodiment 5 FIG. FIG. 10 is a transmission flowchart showing a mobile communication system according to Embodiment 5 of the present invention, and FIG. 11 is a flowchart showing a confirmation process before handover.

Next, the operation will be described. In the fifth embodiment, for example, a description will be given of a case where the mobile station 16 performs a handover when the mobile station 16 moves from the wireless coverage area 24a of the base station 24 to the wireless coverage area 23a of the base station 23.

First, when there is a handover request from the mobile station 16 or the base station 24 (step ST11), the mobile switching center 27 makes a call from all the base stations 23 and 25 adjacent to the currently connected base station 24. The mobile station 16 is instructed to detect the electric field strength of the received radio wave and report the electric field strength to the mobile switching center 27 (step ST12).

When mobile switching center 27 receives the electric field strengths of the radio waves transmitted from adjacent base stations 23 and 25 from mobile station 16, mobile switching center 27 compares the electric field strengths with each other and transmits the radio wave with the maximum electric field strength. The determined base station is determined as a base station to be switched to (step ST13). However, for convenience of explanation, the following description will be made on the assumption that the base station 23 has been determined as the switching destination base station.

When the switching destination base station is determined, the system setting processor 38 of the mobile switching center 27 refers to the contents stored in the mobile station information memory 35 and uses the empty data of the base station 23 as the switching destination base station. Of the communication channels, mobile station 1
6 selects a data communication channel capable of realizing the maximum transmission rate within the range of the maximum transmission rate that can be implemented (step ST14).

Then, the transmission speed before the switching is compared with the transmission speed after the switching (step ST15). If the transmission speed after the switching is faster, the handover of the mobile station 16 is performed quickly. As shown in FIG. 10, before switching the transmission speed, the handover of the mobile station 16 is performed (P54). The case where the transmission speed before switching is faster will be described in a sixth embodiment.

When the handover of the mobile station 16 is performed in this manner, the system setting processor 38 of the mobile switching center 27 confirms the empty data communication channel again, and then switches the data communication channel in the same manner. The base station 23 and the mobile station 16
(P55, P56).

When the mobile switching center 27 notifies the base station 23 and the mobile station 16 of the information on the maximum transmission rate, the mobile switching center 27 counts the time from the time of the notification and stores the time in the mobile station information memory 35. When the set speed switching time is reached, the switching timing information is notified to the base station 23 and the mobile station 16 (P58, P59).

When the switching timing information is notified from the mobile switching center 27, the base station 23 and the mobile station 16
Transmission / reception of communication data is started at a transmission rate corresponding to the information of the maximum transmission rate previously notified (P60, P61).

As described above, according to the fifth embodiment, out of the available data communication channels of the switching destination base station,
Since the data communication channel capable of realizing the maximum transmission rate within the range of the maximum transmission rate that can be executed by the mobile station 16 is selected, every time the mobile station 16 is handed over, the transmission rate of the communication data is changed. Has the effect of being optimized.

When the transmission speed is increased when the handover of the mobile station 16 is performed, the handover is performed before the transmission speed is changed. Therefore, the handover of the mobile station 16 is quickly performed. It has an effect that can be done.

Embodiment 6 FIG. In the above fifth embodiment, the case where the transmission speed is increased when the handover is performed is shown. However, as illustrated in FIG. 12, when the transmission speed is reduced when the handover is performed, after the transmission speed is changed, Handover may be performed. Thereby, there is an effect that disconnection of the wireless connection due to the handover of the mobile station 16 can be avoided.

Embodiment 7 FIG. FIG. 13 is a transmission flowchart showing a mobile communication system according to Embodiment 7 of the present invention, and FIG. 14 is a flowchart showing a transmission power confirmation process.

Next, the operation will be described. In the fifth embodiment, the case where the transmission rate is changed immediately after the handover is performed is described.
In order to double the transmission power, it is necessary to double the transmission power of the transmitting apparatus (increase by 3 db in decibel value). Therefore, as shown in FIG. Is also good.

For example, when communication data is transmitted and received between the mobile station 16 and the base station 23 (step ST21),
The mobile switching center 27 determines whether or not there is a vacant data communication channel higher than the current transmission speed in the cell currently communicating (step ST22).

If there is no free space, this process is terminated. If there is a free space (step ST2).
3) It is determined whether or not the mobile station 16 and the database 11 can execute higher-speed communication by referring to the mobile station information memory 35 and the like (step ST24).

When the mobile switching center 27 determines that high-speed communication is possible, if the mobile station 16 is on the receiving side, the mobile switching center 27 checks the reception power of the mobile station 16 to transmit the signal from the base station 23. The power is checked, and it is determined whether or not there is enough transmission power (step ST26).

On the other hand, if the base station 23 is on the receiving side, the transmission power of the mobile station 16 is checked by checking the reception power of the base station 23, and it is determined whether or not there is enough transmission power (step). ST26).

When the mobile switching center 27 determines that there is enough transmission power (step ST27), it immediately switches the transmission speed (step ST2).
8) If it is determined that there is no margin in the transmission power (step ST27), an instruction to increase the transmission power level is notified to the mobile station 16 (or the base station 23) on the transmission side, and the reception side is notified. The base station 23 (or the mobile station 16) is notified of an instruction to report the received power.

Accordingly, it is determined whether the received power has increased and a margin of transmission power that can withstand a change in transmission rate has been secured, and only when the margin has been secured, transmission rate switching is performed. If the margin is not secured, the switching of the transmission speed is stopped.

As described above, according to the seventh embodiment, when the transmission power corresponding to the change in the transmission rate is increased, the change in the transmission rate is permitted. If the increase in transmission power cannot be obtained, the change of the transmission rate is refused, so if the transmission rate cannot be increased, there is no needless process to increase the transmission rate. It is possible to prevent communication abnormalities from occurring due to the occurrence of such a process.

[0119]

As described above, according to the present invention, when a mobile station performs location registration, the mobile switching center registers the transmission speed that can be handled by the mobile station, and also registers the transmission speed of the mobile station. Since the switching time is registered, there is an effect that the mobile switching center can quickly change the transmission speed of communication data as needed.

According to the present invention, the mobile switching center is provided with an information memory for storing the transmission speed that can be handled by the mobile station and for storing the speed switching time of the mobile station. There is an effect that the transmission speed and the like that can be handled by the user can be surely grasped.

According to the present invention, when the mobile station and the communication device start transmitting communication data, the mobile switching center can allow the current data communication channel within a transmission speed that the mobile station can handle. Since the maximum transmission rate is selected and transmission rate information indicating the transmission rate is notified to the base station and the mobile station, there is an effect that the transmission rate of communication data can be reduced.

According to the present invention, after the transmission rate information is notified to the base station and the mobile station, when the speed switching time of the mobile station stored in the information memory elapses, the switching timing information for instructing the transmission rate switching is transmitted to the base station. Since the notification is made to the station and the mobile station, the transmission speed can be changed quickly and reliably.

According to the present invention, when notification of switching timing information is received from the mobile switching center, transmission / reception of communication data is started at a new transmission rate from a time slot in the first frame after receiving the notification. Thus, there is an effect that the transmission speed can be changed quickly and reliably.

According to the present invention, when the traveling speed is within the range of the walking speed, and when it is detected that the traveling speed exceeds the range of the walking speed, vehicle traveling speed information indicating the fact is transmitted through the base station. Since the notification is made to the mobile switching center, the time slot can be changed so as to be adapted to the traveling speed of the vehicle.

According to the present invention, when the traveling speed is within the range of the vehicle traveling speed, when it is detected that the traveling speed has fallen below the range of the traveling speed of the vehicle, the vehicle traveling speed release information indicating that fact is outputted. Since the mobile switching center is notified through the base station, the time slot can be changed so as to be adapted to the walking speed.

According to the present invention, when the vehicle traveling speed information is notified from the mobile station through the base station, the information memory for storing the vehicle traveling speed information is provided in the mobile switching center. There is an effect that it is possible to reliably grasp that the vehicle is in the range of the vehicle traveling speed.

According to the present invention, when the mobile station is notified of the vehicle running speed release information via the base station, the mobile switching center is provided with an information memory for storing the vehicle running speed release information. There is an effect that it is possible to reliably grasp that the speed is within the range of the walking speed.

According to the present invention, when the vehicle speed information is stored in the information memory, the mobile switching center is provided with a system setting processor for changing the time slot so that the guard time of the data communication channel matches the vehicle speed. With the provision, the guard time of the data communication channel can be held at an appropriate value.

According to the present invention, when the vehicle running speed release information is stored in the information memory, the system setting processor for changing the time slot so that the guard time of the data communication channel matches the walking speed is provided to the mobile switching center. With the provision, the guard time of the data communication channel can be held at an appropriate value.

According to the present invention, when communication data is transmitted from the communication device to the mobile station, the communication device notifies the mobile switching center of the data amount of the communication data. Since the data amount can be grasped, when the communication device transmits a large amount of communication data, there is an effect that the mobile station can determine whether or not the mobile station can reliably receive the large amount of communication data.

According to the present invention, when communication data is transmitted from the mobile station to the communication device, the mobile station notifies the mobile switching center of the data amount of the communication data. Since the data amount can be grasped, when the mobile station transmits a large amount of communication data, there is an effect that it is possible to determine whether or not the communication device can reliably receive the large amount of communication data.

According to the present invention, when transmitting communication data from a communication device or a mobile station to another communication device or another mobile station, the communication device or the mobile station transmitting the communication data moves the data amount of the communication data. The mobile switching center can know the data amount of the communication data because the notification is made to the switching center, so when the communication device or the mobile station transmits a large amount of communication data, the other communication device or the other mobile station is used. Is able to determine whether a large amount of communication data can be reliably received.

According to the present invention, the maximum transmission rate that can be actually transmitted is determined from the maximum transmission rate that can be implemented by the mobile station and the current state of the available data communication channel, and the transmission of communication data is performed at the maximum transmission rate. If you start
It is determined whether or not the data amount notified from the communication device can be transmitted within a certain period of time.If it is determined that the data cannot be transmitted within a certain period of time, transmission of communication data is rejected. There is an effect that a data reception error can be avoided.

According to the present invention, the maximum transmission rate that can be actually transmitted is determined from the maximum transmission rate that can be implemented by the mobile station and the current state of the available data communication channel, and the transmission of communication data is performed at the maximum transmission rate. If you start
It is determined whether the amount of data notified from the mobile station can be transmitted within a certain period of time.If it is determined that the data cannot be transmitted within a certain period of time, transmission of communication data is rejected. There is an effect that a data reception error can be avoided.

According to the present invention, the maximum transmission speed that can be actually transmitted is determined from the maximum transmission speed that can be implemented by the mobile station and the current state of the available data communication channel, and the transmission of communication data is performed at the maximum transmission speed. If you start
It is determined whether or not the amount of data notified from the communication device or mobile station transmitting the communication data can be transmitted within a certain period of time. Since the rejection is performed, there is an effect that a communication data reception error can be avoided.

According to the present invention, when performing handover of a mobile station, the mobile switching center changes the transmission speed between the mobile station and the base station according to the state of the idle data communication channel of the base station to be switched to. Thus, there is an effect that the transmission speed of communication data is optimized every time a handover of the mobile station is performed.

According to the present invention, the base station of the switching destination is determined before performing the handover of the mobile station,
Since the state of the idle data communication channel of the switching destination base station is determined, it is possible to avoid the disconnection of the wireless connection due to the handover of the mobile station.

According to the present invention, the electric field strengths of the radio waves transmitted from all the base stations adjacent to the currently connected base station are detected, and the electric field strengths are reported to the mobile switching center. There is an effect that a guide for selecting a suitable base station can be provided to the mobile switching center.

According to the present invention, when an instruction is received from the mobile switching center, the mobile station reports the electric field strength to the mobile switching center. There is an effect that strength can be obtained.

According to the present invention, the mobile station reports the electric field strength to the mobile switching center when receiving an instruction from the base station. Therefore, the base station determines that the mobile switching center needs the electric field strength. At this time, there is an effect that the mobile switching center can obtain the electric field strength.

According to the present invention, the electric field strengths of the radio waves transmitted from the respective base stations are compared with each other, and the base station which has transmitted the radio wave with the highest electric field strength is determined as the switching destination base station. There is an effect that the optimum base station can be determined as the base station of the switching destination.

According to the present invention, a data communication channel capable of realizing the maximum transmission rate within the range of the maximum transmission rate achievable by the mobile station is selected from the available data communication channels of the base station to be switched. Therefore, there is an effect that the transmission speed of communication data is optimized every time handover of the mobile station is performed.

According to the present invention, when the transmission speed is increased when the handover of the mobile station is performed, the handover is performed before the transmission speed is changed. There is an effect that can be implemented.

According to the present invention, if the transmission speed becomes slower when the handover of the mobile station is performed, the handover is performed after changing the transmission speed. There is an effect that disconnection of the connection can be avoided.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating a mobile communication system according to a first embodiment of the present invention.

FIG. 2 shows time division CDMA, high-speed TDMA, and low-speed TD
FIG. 4 is a data configuration diagram showing a configuration of a time slot for PCS and cellular by MA and the like.

FIG. 3 is a state transition diagram of the mobile communication system.

FIG. 4 is a flowchart illustrating an operation of the mobile communication system according to the first embodiment of the present invention.

FIG. 5 is a configuration diagram showing details of a mobile switching center of a mobile communication system according to Embodiment 2 of the present invention.

FIG. 6 is a state transition diagram for explaining a control subject of the mobile communication system.

FIG. 7 is a transmission flowchart showing a mobile communication system according to Embodiment 3 of the present invention.

FIG. 8 is a table showing the contents of a mobile station information memory in which transmission rates and speed switching times that can be handled by each mobile station are stored.

FIG. 9 is a transmission flowchart showing a mobile communication system according to Embodiment 4 of the present invention.

FIG. 10 is a transmission flowchart showing a mobile communication system according to a fifth embodiment of the present invention.

FIG. 11 is a flowchart showing a confirmation process before handover.

FIG. 12 is a transmission flowchart showing a mobile communication system according to Embodiment 6 of the present invention.

FIG. 13 is a transmission flowchart showing a mobile communication system according to a seventh embodiment of the present invention.

FIG. 14 is a flowchart showing a transmission power confirmation process.

FIG. 15 is a configuration diagram showing a conventional mobile communication system.

[Explanation of symbols]

11 database (communication device), 12 public communication network (PSTN), 13, 14, 15 exchanges, 16-22
Mobile station, 23 to 26 base station, 23a to 26a radio coverage, 27, 28, 29 mobile switching center, 31 PSTN interface, 32 communication path switching unit, 33 high-speed data memory device, 34 data number management processor, 35
Mobile station information memory, 36 transition state control processor,
37 priority control processor, 38 scheme setting processor, 39 signaling processor, 40 base station interface.

Claims (26)

[Claims] 1. A base station for mutually exchanging control information required for wireless communication through a control channel with a mobile station belonging to a radio coverage area, and receiving control information required for data communication from a communication device connected to a public communication network. A mobile switching center that receives control information transmitted from the mobile station through the base station and sets a transmission rate of communication data transmitted and received between the mobile station and a communication device based on both control information. In the mobile communication system provided with the above, when the mobile station performs location registration, the mobile switching center registers a transmission rate that can be handled by the mobile station and registers a speed switching time of the mobile station. A mobile communication system, comprising: 2. The mobile communication system according to claim 1, wherein an information memory for storing a transmission speed that can be handled by the mobile station and for storing a speed switching time of the mobile station is provided in the mobile switching center. system. 3. The mobile switching center, when the mobile station and the communication device start transmitting communication data, sets the maximum transmission rate that the current data communication channel can tolerate among the transmission rates that the mobile station can handle. 3. The mobile communication system according to claim 2, wherein the base station and the mobile station are notified of transmission rate information indicating the transmission rate. 4. The mobile switching center, after notifying the base station and the mobile station of the transmission rate information, when the speed switching time of the mobile station stored in the information memory elapses, changes the transmission timing information instructing the switching of the transmission rate. 4. The mobile communication system according to claim 3, wherein notification is made to a base station and a mobile station. 5. When the base station and the mobile station receive notification of the switching timing information from the mobile switching center, the base station and the mobile station transmit and receive communication data at a new transmission rate from the time slot in the first frame after receiving the notification. The mobile communication system according to claim 4, wherein 6. When the mobile station detects that the traveling speed exceeds the range of the walking speed when the traveling speed is within the range of the walking speed, the mobile station transmits vehicle traveling speed information indicating the fact through the base station. 2. The mobile communication system according to claim 1, wherein a notification is sent to a mobile switching center. 7. When the mobile station detects that the moving speed is below the range of the vehicle running speed when the moving speed is within the range of the vehicle running speed, the mobile station outputs vehicle running speed release information indicating that fact. 2. The mobile communication system according to claim 1, wherein the mobile switching center is notified through a base station. 8. The mobile communication system according to claim 6, wherein when the vehicle travel speed information is notified from the mobile station via the base station, an information memory for storing the vehicle travel speed information is provided in the mobile switching center. system. 9. The mobile switching center according to claim 8, wherein when the mobile station notifies the vehicle traveling speed release information via the base station, an information memory for storing the vehicle traveling speed release information is provided in the mobile switching center. Mobile communication system. 10. The mobile switching center is provided with a system setting processor for changing a time slot so that a guard time of a data communication channel is adapted to the vehicle speed when the vehicle speed information is stored in the information memory. The mobile communication system according to claim 8, wherein: 11. A mobile switching center is provided with a system setting processor for changing a time slot so that a guard time of a data communication channel is adapted to a walking speed when vehicle running speed release information is stored in an information memory. The mobile communication system according to claim 9, wherein: 12. A base station for exchanging control information necessary for wireless communication with a mobile station belonging to a radio coverage area through a control channel, and receiving control information necessary for data communication from a communication device connected to a public communication network. And receiving the control information transmitted from the mobile station through the base station,
In a mobile communication system including a mobile switching center that sets a transmission rate of communication data transmitted and received between the mobile station and the communication device based on both control information, the communication data is transmitted from the communication device to the mobile station. A mobile communication system, wherein the communication device notifies the mobile switching center of the amount of communication data when performing the communication. 13. A base station for mutually exchanging control information necessary for wireless communication with a mobile station belonging to a wireless coverage area through a control channel, and receiving control information necessary for data communication from a communication device connected to a public communication network. And receiving the control information transmitted from the mobile station through the base station,
In a mobile communication system including a mobile switching center for setting a transmission rate of communication data transmitted and received between the mobile station and the communication device based on both control information, the communication data is transmitted from the mobile station to the communication device. The mobile communication system, wherein the mobile station notifies the mobile switching center of the amount of communication data when the mobile station performs the operation. 14. A base station for mutually exchanging control information required for wireless communication with a mobile station belonging to a wireless coverage area through a control channel, and receiving control information required for data communication from a communication device connected to a public communication network. And receiving the control information transmitted from the mobile station through the base station,
A mobile switching center for setting the transmission rate of communication data transmitted and received between the mobile station and the communication device based on both control information; Alternatively, when transmitting communication data to another mobile station, a communication apparatus or mobile station transmitting the communication data notifies the mobile switching center of the data amount of the communication data. 15. The mobile switching center determines the maximum transmission rate that can be actually transmitted from the maximum transmission rate that can be implemented by the mobile station and the status of the current idle data communication channel, and uses the maximum transmission rate to transmit communication data. When transmission starts,
Determining whether the data amount notified from the communication device can be transmitted within a predetermined time, and rejecting transmission of the communication data when determining that the data amount cannot be transmitted within the predetermined time. Item 13. The mobile communication system according to Item 12. 16. The mobile switching center determines the maximum transmission rate that can be actually transmitted from the maximum transmission rate that can be executed by the mobile station and the current state of the available data communication channel, and determines the maximum transmission rate of communication data based on the maximum transmission rate. When transmission starts,
Determining whether or not the data amount notified from the mobile station can be transmitted within a predetermined time, and rejecting transmission of the communication data if it is determined that the transmission cannot be performed within the predetermined time. Item 14. The mobile communication system according to item 13. 17. The mobile switching center determines the maximum transmission rate that can be actually transmitted from the maximum transmission rate that can be implemented by the mobile station and the status of the current idle data communication channel, and uses the maximum transmission rate to transmit communication data. When transmission starts,
It is determined whether the amount of data notified from the communication device or mobile station transmitting the communication data can be transmitted within a certain period of time.If it is determined that the data cannot be transmitted within a certain period of time, transmission of the communication data is stopped. The mobile communication system according to claim 14, wherein rejection is performed. 18. A base station for exchanging control information necessary for wireless communication with a mobile station belonging to a wireless coverage area through a control channel, and receiving control information necessary for data communication from a communication device connected to a public communication network. And receiving the control information transmitted from the mobile station through the base station,
When performing a handover of the mobile station in a mobile communication system having a mobile switching center that sets the transmission rate of communication data transmitted and received between the mobile station and the communication device based on both control information, A mobile communication system, wherein the mobile switching center changes the transmission speed between the mobile station and the base station in accordance with the status of an idle data communication channel of the base station to be switched to. 19. The mobile switching center determines a switching destination base station before performing handover of a mobile station,
19. The mobile communication system according to claim 18, wherein a status of an idle data communication channel of the switching destination base station is determined. 20. The mobile station detects electric field strengths of radio waves transmitted from all base stations adjacent to a currently connected base station, and reports the electric field strength to a mobile switching center. Item 20. The mobile communication system according to Item 19. 21. The mobile communication system according to claim 20, wherein the mobile station reports an electric field strength to the mobile switching center when receiving an instruction from the mobile switching center. 22. The mobile communication system according to claim 20, wherein the mobile station reports an electric field strength to the mobile switching center when receiving an instruction from the base station. 23. The mobile switching center compares the electric field strengths of radio waves transmitted from each base station with each other and determines a base station that has transmitted a radio wave with the highest electric field strength as a base station to be switched. The mobile communication system according to claim 20, wherein 24. The mobile switching center selects a data communication channel capable of realizing a maximum transmission speed within a range of a maximum transmission speed achievable by the mobile station, out of available data communication channels of a base station to be switched to. The mobile communication system according to claim 19, wherein: 25. The mobile switching center according to claim 24, wherein when the transmission speed increases when the mobile station performs the handover, the mobile switching center performs the handover before changing the transmission speed. Communications system. 26. The mobile communication system according to claim 24, wherein if the transmission speed is reduced when the mobile station performs the handover, the mobile switching center performs the handover after changing the transmission speed. system.