JPH09205668A - Mobile communication system and communication channel reservation method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To warrant reservation of a communication channel for callback from a communication destination in the case that a busy mobile station having sent a communication channel reservation request signal to a base station switches the speech channel and interrupts the communication. SOLUTION: A mobile station 3 resident in a radio zone 1 makes communication with a base station 4 via a radio channel 12. In the case that the mobile station 3 makes communication via the base station 4 and an exchange station 6, the exchange station 6 discriminates whether or not a communication destination 8 of the mobile station 3 is a communication destination requiring reservation of a communication channel after the communication interruption from the mobile station 3. As the result of discrimination, when the communication destination 8 is a destination requiring the reservation of a communication channel, the exchange station 6 sends a communication channel reservation request signal including communication channel information used for the communication between the mobile station 3 and the communication destination 8 to the base station 4. Thus, even when the mobile station 3 making communication with the communication destination 8 interrupts communication, when the communication destination 8 calls the mobile station 3 within a prescribed time, the reservation of a communication channel is warranted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication channel reservation method used in a mobile communication system having a minimum radio zone structure and a system therefor. In particular, it relates to technology used for emergency communication.

[0002]

2. Description of the Related Art FIG. 1 shows a configuration of a mobile communication system, and radio zone switching control in the configuration will be described.

In this mobile communication system, wireless zones 1 and 2 are respectively formed, and a mobile station 3 and a wireless channel 1 are formed.
The base stations 4 and 5 are connected via 2 and 13, and the exchange station 6 is connected to the base stations 4 and 5 via wired channels 9 and 10 to perform exchange control. The exchange 6 is included in the communication network 7, and the communication network 7 is a generic term for a fixed network and a mobile communication network. The mobile station 3 is moving from the wireless zone 1 to the wireless zone 2, and the wireless zone 1 becomes the old wireless zone and the wireless zone 2 becomes the new wireless zone. Communication channel 1 on communication network 7
The communication destination 8 connected by 1 is a communication destination that needs to hold the communication channel after the communication from the mobile station 3 is disconnected, and corresponds to police, fire, and the like. That is, it is the communication destination of the emergency communication.

Next, FIG. 2 shows a sequence chart showing a procedure of a conventional communication line holding method, and the procedure will be described.

[Step S0-1] The mobile station 3 makes the base station 4
When communicating with the communication destination 8 in a certain wireless zone, a communication start request signal is transmitted to the exchange 6 via the base station 4 at the start of communication. The communication start request signal includes a communication partner identification number with which the mobile station 3 tries to communicate. [Step S0-2] When the base station 4 receives the communication start request signal from the mobile station 3, the base station 4 determines the mobile station 3 from the communication partner identification number.
Is determined to be the communication destination 8, and [Step S0-3] As a result of the determination, the communication destination is the communication destination 8
In this case, the base station 4 recognizes that the wireless channel 12 is a wireless channel that needs to be held after the communication with the mobile station is disconnected.

[Step S0-4] The exchange 6 is the mobile station 3
When the communication start request signal is received from the communication partner, it is determined from the communication partner identification number whether or not the communication partner of the mobile station 3 is the communication partner 8. [Step S0-5] As a result of the determination, the communication partner is the communication partner 8
If so, the switching center 6 recognizes that the wired channel 9 is a wired channel that needs to be held after the communication with the mobile station 3 is disconnected.

[Step S0-6] Then, the communication destination 8-
Communication channel 11-switching station 6-wired channel 9-base station 4-radio channel 12-communication channel is connected to mobile station 3 and mobile station 3 communicates with communication destination 8.

Here, when the mobile station 3 disconnects communication while the mobile station 3 and the communication destination 8 are communicating, [step S0-7] the base station 4 causes the mobile station 3 and the communication destination 8 to communicate.
The wireless channel 12 used for communication with is held for a certain period of time, and the held wireless channel 12 is used only when there is a call request of the mobile station 3 from the communication destination 8 within the certain period of time.

[Step S0-8] The switching center 6 is the mobile station 3
And the wired channel 9 used for communication between the communication destination 8 and the communication destination 8 are held for a certain period of time, and the held wired channel 9 is used only when the communication destination 8 requests the mobile station 3 within a certain period of time. .

[Step S0-9] Next, communication destination 8-communication channel 11-switching station 6-wired channel 9-base station 4
-Radio channel 12-When the mobile station 3 and the communication channel are connected, and the mobile station 3 moves from the old radio zone 1 to the new radio zone 2 while the mobile station 3 and the communication destination 8 are communicating, the mobile station 3
Enters a channel switching operation during communication and transmits a channel switching request signal to the base station 5. This signal contains the mobile station identification number.

[Step S0-10] When the switching center 6 receives the channel switching request signal from the mobile station 3 via the base station 5, the mobile station 3 specified by the mobile station identification number.
Determines whether or not communication is in progress via the exchange station 6, and if communication is already in progress, determines that channel switching is possible.

[Step S01-11] If the result of determination is that channel switching is possible, the switching center 6
The communication channel connected to the base station 5 is switched to the base station 5.
As a result, the communication destination 8-communication channel 11-switching station 6-
The communication channel is connected through the route of the wired channel 10-the base station 5-the wireless channel 13-the mobile station 3, the channel switching during communication is completed, and the communication is continued.

[Step S01-12] After that, when the mobile station 3 disconnects communication for some reason, [Step S01-13] The switching center 6 uses the cable used for communication between the mobile station 3 and the communication destination 8. The channel 10 is held for a certain time, and the held wired channel 10 is used only for a call request of the mobile station 3 from the communication destination 8 within the certain time.

[0014]

In this prior art,
If the mobile station that is communicating with the communication destination that needs to hold the communication channel after disconnecting the communication from the mobile station disconnects the communication after the channel switching during communication, the wired connection between the base station and the switching center The channel is reserved for a certain period of time, but the wireless channel between the base station and the mobile station is not reserved, so if the mobile station is called from the communication destination within a certain period of time (also referred to as call back). ), There is a problem that the guarantee of the communication channel is not guaranteed. Communication from the mobile station to the communication destination is very important because it is often related to human life due to its nature, and when the mobile station disconnects communication for unavoidable reasons, the communication destination must be It is desirable to be able to call the mobile station.

The present invention solves such a problem. When the mobile station communicating with the emergency communication destination disconnects the communication after switching the channel during communication, the base station and the mobile station communicate with each other. It is an object of the present invention to secure a communication channel when a mobile station is called from the communication destination within a fixed time by holding the wireless channel between the fixed times.
Another object of the present invention is to hold a communication channel to a mobile station for a certain period of time on the network side of mobile communication so that a channel for call back can be secured.

[0016]

DISCLOSURE OF THE INVENTION According to the present invention, when communication channel switching is performed during communication between a communication destination and a mobile station, which requires communication channel reservation after communication disconnection from the mobile station, exchange is performed. The station determines whether or not the communication destination of the mobile station is a communication destination that requires communication channel hold.If the communication destination of the mobile station is a communication destination that requires communication channel hold, the communication channel switching destination After transmitting the communication channel hold request signal to the base station, the base station receiving it holds the wireless channel used for communication between the mobile station and the communication destination for a certain period of time after the mobile station disconnects the communication. It is characterized by

Even if the communication destination is required to hold the communication channel after the communication is disconnected from the mobile station and the mobile station is communicating, and the mobile station disconnects the communication after that, the communication destination remains The communication channel with the mobile station is reserved for a certain period of time, and it is guaranteed that the communication channel is secured when the communication destination tries to call the mobile station within the certain period of time.

That is, a first aspect of the present invention comprises a communication device, a base station which is connected to the communication device via a wireless line and performs communication control, and an exchange station which is connected to the base station and performs exchange control. In the mobile communication system described above, when the communication device communicates via the base station and the exchange, the switching center holds a communication channel after the communication destination of the communication device disconnects from the communication device. It is determined whether or not the communication destination is a required communication destination, and as a result of this determination, if the communication destination requires a communication channel hold, it is used for communication between the communication device and the communication destination with respect to the base station. The communication channel holding request signal including the communication channel information is transmitted to the base station.

According to a second aspect, in the first aspect, the base station keeps the radio channel between the communication device and the base station constant after the communication device disconnects communication based on the communication channel hold request signal. It is characterized in that it is held for a certain period of time and is used when there is a call request from a communication destination to a communication device within a fixed time.

As a result, the base station can secure the communication channel for the call back after the communication disconnection by the communication channel hold request signal from the exchange.

A third aspect is that the exchange holds a channel with the base station for a certain period of time when the communication device disconnects communication when transmitting a communication channel hold request signal to the base station. However, the base station is characterized in that it holds a wireless channel with the communication device for a certain period of time.

A fourth aspect is that, when the base station receives the communication channel hold request signal from the exchange, when the communication device disconnects the communication, the base station holds the channel with the exchange for a certain period of time, Further, it is characterized in that the wireless channel with the communication device is held for a certain period of time.

[0023] In a fifth aspect, the exchange station determines whether or not the communication destination of the communication device needs to hold the channel, and the base station determines that the base station is based on the communication channel hold request signal transmitted by the exchange station. , When a communication device disconnects communication, a channel with an exchange is held for a certain period of time, and a wireless channel with a communication device is held for a certain period of time.

From any of the viewpoints, the exchange or the base station can secure a communication channel for call back when the communication device (mobile station) disconnects communication.

Next, a sixth aspect is characterized by the configuration of a mobile communication switching center and a base station for carrying out the inventions of the third to fifth aspects. In a mobile communication system including a base station that is connected to a device via a wireless line and performs communication control, and a mobile station that is connected to the base station and performs switching control, the mobile station is configured such that the communication device includes the base station and A means for determining whether or not the communication destination of the communication device is a communication destination that needs to hold a communication channel after disconnection of communication from the communication device when performing communication via the exchange; and, as a result of the determination, the communication When the communication destination of the device is a communication destination that requires communication channel hold, a communication channel hold request signal including communication channel information used for communication between the communication device and the communication destination is sent to the base station. Means to send Wherein the base station, when receiving the communication channel hold request signal from the switching center,
It is characterized by further comprising means for holding a wireless channel used for communication between the communication device and the communication destination for a certain period of time.

As an implementation of the third aspect of the invention, it is preferable that the exchange include means for holding a channel with the base station for a certain period of time when the communication device disconnects communication.

Further, in order to implement the invention of the fourth aspect, the base station includes means for holding a channel between the exchange and the base station for a certain period of time when the communication device disconnects communication. Is desirable.

Further, a seventh aspect relates to a communication channel holding method in the case where the communication device moves across a wireless zone to switch the communication channel. In the switching center, the communication device operates via the base station. When communication is being performed with a communication destination that requires communication channel hold after disconnection, the communication channel is switched between the communication device and the switching center and the communication channel needs to be held while the communication destination moves. If it is a communication destination that needs to hold the communication channel, the base station in the wireless zone to which the communication device moves will communicate with the communication device and the communication destination. It is characterized in that a communication channel hold request signal including the communication channel information being used is transmitted.

As a result, even when the communication device moves across the wireless zone and the communication channel switching control is performed, the communication channel of the movement destination can be secured for a certain period of time as the communication channel for recall.

An eighth aspect is the seventh aspect, in the case where the communication device disconnects communication when the exchange transmits a communication channel hold request signal to the base station to which the communication device has moved. , The channel between the exchange and the base station used for communication between the communication device and the communication destination is held for a certain period of time, and the base station communicates between the communication device and the communication destination based on the communication channel hold request signal. The wireless channel between the base station and the communication device used for the communication is held for a certain period of time, and the held channel and the wireless channel are used when there is a call request from the communication destination to the communication device within the certain period of time. It is characterized by

In a ninth aspect based on the seventh aspect, the base station establishes a channel between the base station and the switching center and a radio channel between the base station and the communication device based on the communication channel hold request signal. Is held for a certain period of time.

The eighth and ninth aspects differ depending on whether the base station holds the communication channel within a certain period of time or whether it is shared by the switching center as well. In either configuration, the communication device is wireless. Even when the zone is moved and the communication channel is switched with the new base station, the new base station or the switching center can secure the communication channel for returning to the communication device.

A tenth aspect is an invention of a mobile radio system for carrying out the inventions of the seventh to ninth aspects, in which a service area is composed of a plurality of radio zones, a communication device and each radio. In a mobile communication system, which is installed in a zone and is connected to a communication device via a wireless line to perform communication control, and a mobile switching system connected to the base station to perform switching control, the mobile switching system comprises: When the device moves across a wireless zone while communicating with a communication destination via one of the base stations, means for controlling the switching of the communication channel between the communication device and the exchange, and the communication device A means for determining whether or not the communication destination is a communication destination that requires a communication channel hold after disconnecting communication from the communication device; and, as a result of this determination, if the communication destination requires a communication channel hold, the communication apparatus Means for transmitting a communication channel hold request signal including communication channel information used for communication between the communication device and the communication destination to a base station in the movement destination wireless zone, and a destination of the communication device. The base station of the wireless zone is based on the communication channel hold request signal, and when the communication device disconnects communication, the base station used for communication between the communication device and the communication destination, and the communication device It is characterized by comprising means for holding a wireless channel between them for a certain period of time.

It is preferable that the switching center includes means for holding a channel with the base station for a certain period of time when the communication device disconnects communication, and the base station in the wireless zone to which the communication device moves. The station preferably includes means for holding a channel between the exchange and the base station for a certain period of time when the communication device disconnects communication.

As described above, according to the present invention, even when the mobile station makes an emergency communication, the holding state of the channel is stored on the network side, and when the mobile station disconnects the communication, the emergency communication destination is set. Even when the call back is made, since a communication channel for the call back is secured, a reliable call back can be made,
The communication required for emergency communication is guaranteed.

[0036]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

[0037]

[Embodiment 1] FIG. 3 shows a configuration of a mobile communication system which is a premise of Embodiment 1 of the present invention. Here, the mobile station 3 is communicating with the base station 4 in the wireless zone 1 via the wireless channel 12. The communication network 7 has an exchange station 6 connected to the base station 4, and is connected to the base station 4 via a wired channel 9. The communication network 7 is a communication network including the exchange 6, and is a generic term for fixed networks and mobile communication networks. The communication destination 8 that needs to hold the communication channel after disconnecting the communication from the mobile station 3 corresponds to police, fire, and the like. The communication channel 11 is connected to the communication destination 8 via the exchange 6 and the communication network 7.

Here, in the first embodiment, the mobile station 3
In the mobile communication system including the base station 4 connected to the mobile station 3 via the wireless channel 12 for communication control, and the exchange station 6 connected to the base station 4 for exchange control, the exchange station 6 , When the mobile station 3 communicates via the base station 4 and the switching center 6, whether the communication destination 8 of the mobile station 3 is a communication destination that requires a communication channel hold after disconnection from the mobile station 3 In the case of the communication destination 8 requiring the communication channel hold as a result of the determination, the communication channel information used for communication between the mobile station 3 and the communication destination 8 with respect to the base station 4 Is transmitted to the base station 4 with a communication channel hold request signal.

Next, FIG. 4 shows a sequence chart of the communication channel holding operation of the first embodiment to explain the operation.

Communication destination 8-Communication channel 11-Switching station 6-
Wired channel 9-base station 4-radio channel 12-When the communication channel is connected to the mobile station 3 and communication is carried out, [Step S1-1] The exchange is the communication destination of the mobile station 3 from the mobile station. After the communication is disconnected, it is determined whether or not the communication destination is the communication destination 8 that needs to hold the communication channel. [Step S1-2] As a result of this determination, when the communication destination of the mobile station 3 is the communication destination 8 requiring the communication channel hold, the switching center 6 transmits a communication channel hold request signal to the base station 4. . This signal includes communication channel information used for communication between the mobile station 3 and the communication destination 8.

In FIG. 4, the exchange 6 carries out [steps S1-1] and [step S1-2] during communication between the mobile station 3 and the communication destination 8, but both steps start communication. It is sufficient to carry out at any timing from to disconnection of communication.

In the conventional method, the base station and the switching station recognize whether or not the channel needs to be held after the communication is cut off by the communication partner identification number, but the switching station sends the channel holding request signal to the base station. There is no configuration to do.

[0043]

Second Embodiment Next, a second embodiment will be described. The mobile communication system that is the premise of the second embodiment is as shown in FIG.

In the second embodiment, when the mobile station 3 communicates with the mobile station 3 via the base station 4 and the switching station 6, the base station 4 requests to hold a communication channel including the communication channel information transmitted from the switching station 6. When the mobile station 3 disconnects the communication upon receiving the signal, the wireless channel 12 between the base station 4 and the mobile station 3 used for the communication between the mobile station 3 and the communication destination 8 is used.
Is held for a certain period of time, and the held wireless channel 12
Is used only when there is a call request for the mobile station 3 from the communication destination 8 within this fixed time.

The fixed time is, for example, 40 seconds, which can be arbitrarily determined in consideration of the system configuration and various circumstances such as the necessity of recalling.

Next, FIG. 5 shows a sequence chart of the operation of the second embodiment to explain the operation.

In the second embodiment, when communication destination 8-communication channel 11-switching station 6-wired channel 9-base station 4-radio channel 12-mobile station 3 and communication channel are connected and communication is performed, [Step S2-1] When the base station 4 receives the communication channel hold request signal including the communication channel information used in the communication between the mobile station 3 and the communication destination 8 transmitted from the exchange station 6, [step S2] -2] Recognizing that the wireless channel 12 is a wireless channel that needs to be put on hold after disconnection of communication from the mobile station 3, [Step S2-3] and then, when the mobile station 3 disconnects communication for some reason, [ Step S2-4] The base station 4 holds the wireless channel 12 used for communication between the mobile station 3 and the communication destination 8 for a certain period of time, and the held wireless channel 12 communicates within the certain period of time. It is used only when there is a call request for the mobile station 3 from the destination 8.

In FIG. 5, the base station 5 executes the steps [step S2-1] and [step S-2] during the communication between the mobile station 3 and the communication destination 8, but both steps start the communication. It suffices to be carried out at any timing from the time to the communication disconnection.

[0049]

Third Embodiment A third embodiment of the present invention will be described with reference to FIGS. The mobile communication system on which the third embodiment is based is the same as that shown in FIG.

In the third embodiment, the switching center 6 is the mobile station 3
When the communication is performed via the base station 4 and the switching center 6, it is determined whether or not the communication destination 8 of the mobile station 3 is a communication destination that needs to hold the communication channel after the communication from the mobile station 3 is disconnected. As a result of the determination, in the case of the communication destination 8 requiring the communication channel suspension, the communication channel suspension request signal including the communication channel information used for the communication between the mobile station 3 and the communication destination 8 with respect to the base station 4. Then, when the mobile station 3 disconnects the communication, the wired channel 9 between the exchange 6 and the base station 4 used for communication between the mobile station 3 and the communication destination 8 is reserved for a certain period of time, The station 4 holds the radio channel 12 between the base station 4 and the mobile station 3 used for communication between the mobile station 3 and the communication destination 8 when the mobile station 3 disconnects communication for a certain period of time, The suspended wired channel 9 and wireless channel 12 are fixed Characterized in that it is used only when there is a call request of the mobile station 3 from the communication destination 8 within.

FIG. 6 shows a sequence chart of the third embodiment for explanation.

Communication destination 8-Communication channel 11-Switching station 6-
Wired channel 9-base station 4-radio channel 12-When the mobile station 3 and the communication channel are connected and communication is performed, [Step S3-1], the exchange 6 communicates with the communication destination 8 of the mobile station through the communication device. After disconnecting, it is determined whether or not the communication destination is a communication destination that requires a communication channel hold. [Step S3-2] If the result of determination is that the communication destination of the mobile station 3 is the communication destination 8, the switching center 6 transmits a communication channel hold request signal to the base station 4. This signal includes communication channel information used for communication between the mobile station 3 and the communication destination 8. [Step S3-3] When the base station 4 receives the communication channel hold request signal including the communication channel information used for the communication between the mobile station 3 and the communication destination 8 transmitted from the exchange 6, the wireless channel 12 Recognize that it is a wireless channel that needs to be held after disconnection of communication from the mobile station 3, [Step S3-4], and then the mobile station 3 disconnects communication for some reason, [Step S3-5]. The exchange 6 holds the wired channel 9 used for communication between the mobile station 3 and the communication destination 8 for a certain period of time. The reserved wired channel 9 is used only for a call request of the mobile station 3 from the communication destination 8 within a fixed time. [Step S3-6] The base station 4 holds the wireless channel 12 used for communication between the mobile station 3 and the communication destination 8 for a certain period of time. The reserved wireless channel 12 is used only when the communication destination 8 requests the mobile station 3 to be called within a certain period of time.

In FIG. 6, the exchange 6 carries out [steps S3-1] and [step S3-2] during communication between the mobile station 3 and the communication destination 8, but both steps start communication. It suffices to be carried out at any timing from the time to the communication disconnection.

[0054]

Fourth Embodiment A fourth embodiment of the present invention will be described with reference to FIGS. The mobile communication system on which the fourth embodiment is based is the same as that shown in FIG.

The fourth embodiment is characterized in the operation on the side of the base station 4, and the base station 4 receives from the mobile station 3 with which the mobile station 3 is communicating via the base station 4 and the switching center 6. When a communication channel hold request signal including communication channel information used for communication with the communication destination 8 that requires communication channel hold after disconnection is received from the switching center 6, the mobile station based on this communication channel hold request signal. 3 disconnects the communication, the wired channel 9 between the exchange 6 and the base station 4 used for communication between the mobile station 3 and the communication destination 8 and the base station 4
The wireless channel 12 between the mobile station 3 and the mobile station 3 for a certain period of time, and the reserved wired channel 9 and wireless channel 12 are used when the communication destination 8 requests the mobile station 3 to call within the certain period of time. It is characterized by being done.

FIG. 7 shows a sequence chart of the fourth embodiment for explanation.

Communication destination 8-Communication channel 11-Switching station 6-
Wired channel 9-base station 4-radio channel 12-When the communication channel is connected to the mobile station 3 and communication is performed, [Step S4-1] The base station 4 communicates with the mobile station 3 transmitted from the exchange 6. A communication channel hold request signal including communication channel information used in communication with the communication destination 8 is received. [Step S4-2] Recognizing that the wired channel 9 and the wireless channel 12 are communication channels that need to be put on hold after communication disconnection from the mobile station 3, [Step S4-3] After that, the mobile station 3 for some reason When the communication is disconnected, [step S4-4] The base station 4 holds the wired channel 9 and the wireless channel 12 used for the communication between the mobile station 3 and the communication destination 8 for a certain period of time, and the held wired channel 9 is held.
The wireless channel 12 is used only when the communication destination 8 requests the mobile station 3 to be called within a certain period of time.

In FIG. 7, the base station 4 executes [steps S4-1] and [step S4-2] during communication between the mobile station 3 and the communication destination 8, but both steps start communication. It suffices to be carried out at any timing from the time to the communication disconnection.

[0059]

Fifth Embodiment A fifth embodiment of the present invention will be described with reference to FIGS. The mobile communication system on which the fifth embodiment is based is the same as that shown in FIG.

The fifth embodiment is characterized by the communication destination determining operation of the exchange station 6 and the channel recognition and channel holding operation of the base station 4. In the exchange station 6, the mobile station 3 selects the base station 4 and the exchange station 6. In the case of performing communication via the mobile station 3, it is determined whether or not the communication destination of the mobile station 3 is the communication destination 8 that needs to hold the communication channel after the communication disconnection from the mobile station 3, and as a result of this determination,
In the case of the communication destination 8 requiring the communication channel hold, a communication channel hold request signal including communication channel information used for communication between the mobile station 3 and the communication destination 8 is transmitted to the base station 4, When the mobile station 3 disconnects the communication based on the communication channel hold request signal, the base station 4 connects the mobile station 3 and the communication destination 8 with the exchange 6 and the base station 4 which have been used for communication. The wired channel 9 and the wireless channel 12 between the base station 4 and the mobile station 3 are held for a fixed time, and the held wired channel 9 and wireless channel 12 are called from the communication destination 8 to the mobile station 3 within a fixed time. It is characterized in that it is used only when requested.

FIG. 8 shows a sequence chart of the fifth embodiment for explanation.

Communication destination 8-Communication channel 11-Switching station 6-
When the communication channel is connected by connecting the wired channel 9-base station 4-radio channel 12-mobile station 3 to each other, [Step S5-1] The exchange 6 communicates with the communication destination 8 of the mobile station through the communication device. After disconnecting, it is determined whether or not the communication destination is a communication destination that requires a communication channel hold. [Step S5-2] If the result of determination is that the communication destination of the mobile station 3 is the communication destination 8, the switching center 6 transmits a communication channel hold request signal to the base station 4. This signal includes communication channel information used for communication between the mobile station 3 and the communication destination 8.

[Step S5-3] When the base station 4 receives the communication channel hold request signal including the communication channel information used for communication between the mobile station 3 and the communication destination 8 transmitted from the exchange 6, It is recognized that the wired channel 9 and the wireless channel 12 are communication channels that need to be held after the communication with the mobile station 3 is disconnected. [Step S5-4] After that, when the mobile station 3 disconnects from the communication for some reason, [Step S5-5] the base station 4 uses the wired channel 9 and the wire channel 9 used for the communication between the mobile station 3 and the communication destination 8. The wireless channel 12 is suspended for a certain period of time. The reserved wired channel 9 and wireless channel 12 are communicated to the communication destination 8 within a fixed time.
It is used only when there is a mobile station call request from.

In FIG. 8, the exchange 6 performs [steps S5-1] and [step S5-2] during the communication between the mobile station 3 and the communication destination 8, but both steps start communication. It suffices to be carried out at any timing from the time to the communication disconnection.

[0065]

Sixth Embodiment A sixth embodiment of the present invention will be described with reference to FIGS. 9 and 10. The mobile communication system on which the sixth embodiment is based is the same as the mobile communication system shown in FIG.

That is, in the mobile communication system shown in FIG. 9, the service area is made up of a plurality of wireless zones, installed in the mobile station 3 and the respective wireless zones 1 and 2, and connected to the mobile station 3 via a wireless channel. The mobile communication system includes base stations 4 and 5 that perform communication control, and a switching center 6 that is connected to the base stations through wired channels 9 and 10 and that performs switching control.

In this mobile communication system, reference numeral 7 is a communication network including the exchange 6, and reference numeral 8 is a communication destination that requires a communication channel hold after the communication from the mobile station 3 is cut off. Applicable Reference numeral 11 is a communication channel connected to the communication destination 8 via the exchange 6 and the communication network 7.

In the sixth embodiment, the exchange 6
While the mobile station 3 is communicating with the communication destination 8 via the base station 4,
When moving across a wireless zone, the communication channel switching control between the mobile station 3 and the exchange 6 is performed, and the communication destination 8 needs to hold the communication channel after the communication disconnection from the mobile station 3. Whether or not the mobile station 3 needs to hold the communication channel as a result of the determination, the mobile station 3 sends the mobile station 3 and the communication destination 8 to the base station 5 in the destination wireless zone 2. It is characterized by transmitting a communication channel hold request signal including communication channel information used for communication between the two.

The operation of the sixth embodiment will be described with reference to the sequence chart of the sixth embodiment. [Step S6-1] Communication destination 8-Communication channel 11-Switching station 6-Wired channel 9-Base station 4-Wireless channel 12
-The mobile station 3 is connected to the communication channel, and while the mobile station 3 and the communication destination 8 are communicating, the mobile station 3 shifts from the old wireless zone 1 to the new wireless zone 2, and the exchange 6 via the base station 5. A channel switching request signal including the mobile station identification number is sent to the. [Step S6-2] When the exchange station 6 receives the channel switching request signal, the exchange station 6 determines whether or not the mobile station 3 identified by the mobile station identification number is communicating through the exchange station 6, and is already communicating. If it is, it is determined that channel switching is possible. [Step S6-3] If the result of determination is that channel switching is possible, the switching center 6 switches the communication channel connected to the base station 4 to the base station 5. As a result, the communication destination 8-communication channel 11-switching station 6-wired channel 10-
The communication channel is connected through the route of the base station 5-radio channel 13-mobile station 3 and the channel switching during communication is completed,
Communication continues.

[Step S6-4] Further, the switching center 6 judges whether the communication destination of the mobile station 3 is the communication destination 8. [Step S6-5] As a result of the determination, the communication destination 8 of which the communication destination of the mobile station 3 is to hold the communication channel after the communication disconnection 8
If so, the exchange 6 transmits a communication channel hold request signal to the base station 5. This signal includes communication channel information used in communication between the mobile station 3 and the communication destination 8.

In FIG. 10, the exchange performs steps [S6-2] and [step S6-3] while the mobile station 3 and the communication destination 8 are communicating, but both steps switch channels. It may be carried out at any timing from the start to the communication disconnection.

[0072]

Seventh Embodiment A seventh embodiment of the present invention will be described with reference to FIGS. 9 and 11. FIG. 11 is a sequence chart showing the operation of the communication channel holding method of the seventh embodiment.

Here, in the seventh embodiment, the exchange 6
While the mobile station 3 is communicating with the communication destination 8 via the base station 4,
When moving across a wireless zone, the communication channel switching control between the mobile station 3 and the exchange 6 is performed, and the communication destination 8 needs to hold the communication channel after the communication disconnection from the mobile station 3. Whether or not the mobile station 3 needs to hold the communication channel as a result of the determination, the mobile station 3 sends the mobile station 3 and the communication destination 8 to the base station 5 in the destination wireless zone 2. When the mobile station 3 disconnects the communication by transmitting the communication channel hold request signal including the communication channel information used for the communication between the mobile stations 3,
The wire channel 10 between the exchange 6 and the base station 5, which is used for communication between the mobile station 3 and the communication destination 8, is used for communication between the mobile station 3 and the communication destination 8. The wireless channel 13 between the base station 5 and the mobile station 8 that was previously held is held for a certain period of time, and the held wired channel 10 and wireless channel 13 are requested to call the mobile station 3 from the communication destination 8 within a certain period of time. The feature is that it is used only when

Next, the operation of the seventh embodiment will be described with reference to FIG. [Step S7-1] Communication destination 8-Communication channel 11-Switching station 6-Wired channel 9-Base station 4-Wireless channel 12
-The mobile station 3 is connected to the communication channel, and while the mobile station 3 and the communication destination 8 are communicating, the mobile station 3 shifts from the old wireless zone 1 to the new wireless zone 2, and the exchange 6 via the base station 5. A channel switching request signal including the mobile station identification number is sent to the. [Step S7-2] When the exchange station 6 receives the channel switching request signal, the exchange station 6 determines whether or not the mobile station 3 identified by the mobile station identification number is communicating through the exchange station 6, and is already communicating. If it is, it is determined that channel switching is possible. [Step S7-3] If the result of determination is that channel switching is possible, the switching center 6 switches the communication channel connected to the base station 4 to the base station 5. As a result, the communication destination 8-communication channel 11-switching station 6-wired channel 10-
The communication channel is connected through the route of the base station 5-radio channel 13-mobile station 3 and the channel switching during communication is completed,
Communication continues.

[Step S7-4] Further, the exchange 6 determines whether the communication destination of the mobile station 3 is the communication destination 8. [Step S7-5] As a result of the determination, the communication destination 8 of the mobile station 3 which needs to hold the communication channel after the communication destination 3 is disconnected.
If so, the exchange 6 transmits a communication channel hold request signal to the base station 5. This signal includes communication channel information used in communication between the mobile station 3 and the communication destination 8. [Step S7-6] The base station 5 that has received the communication channel hold request signal from the exchange 6 recognizes that the wireless channel 13 is a wireless channel that needs to be held after disconnection from the mobile station 3. [Step S7-7] After that, the mobile station 3
Disconnects communication. [Step S7-8] The exchange 6 holds the wired channel 10 used for communication between the mobile station 3 and the communication destination 8 for a certain period of time. The reserved wired channel 10 is used only for a call request of the mobile station 3 from the communication destination 8 within a fixed time. [Step S7-9] The base station 5 holds the radio channel 13 used for communication between the mobile station 3 and the communication destination 8 for a certain period of time. The reserved wireless channel 13 is used only for a call request from the communication destination 8 and the mobile station 3 within a fixed time.

In FIG. 11, the exchange 6 carries out [steps S7-4] and [step S7-5] during the communication between the mobile station 3 and the communication destination 8. It may be performed at any timing from the start of switching to the disconnection of communication.

As described above, according to the seventh embodiment, the mobile station 3 that is in communication with the communication destination 8 that needs to hold the communication channel after disconnecting the communication from the mobile station 3 performs communication after switching the channel during communication. Even if the mobile station 3 is disconnected, if the communication destination 8 tries to call the mobile station 3 within a fixed time, the securing of the communication channel is guaranteed.

[0078]

Eighth Embodiment An eighth embodiment of the present invention will be described with reference to FIGS. FIG. 12 is a sequence chart showing the operation of the communication channel holding method of the eighth embodiment.

In this embodiment, the exchange 6
While the mobile station 3 is communicating with the communication destination 8 via the base station 4,
When moving across a wireless zone, the communication channel switching control between the mobile station 3 and the exchange 6 is performed, and the communication destination 8 needs to hold the communication channel after the communication disconnection from the mobile station 3. Whether or not the mobile station 3 needs to hold the communication channel as a result of the determination, the mobile station 3 sends the mobile station 3 and the communication destination 8 to the base station 5 in the destination wireless zone 2. When the mobile station 3 disconnects communication by transmitting a communication channel hold request signal including communication channel information used for communication with the base station 5
Holds a wired channel 10 between the mobile station 3 and the exchange 6 used for communication with the communication destination 8 and a wireless channel 13 between the base station 5 and the mobile station 8 for a certain period of time, and holds this hold. The wired channel 10 and the wireless channel 13 are characterized in that they are used only when there is a call request of the mobile station 3 from the communication destination 8 within a fixed time.

Next, the operation of the eighth embodiment will be described with reference to FIG. [Step S8-1] Communication destination 8-Communication channel 11-Switching station 6-Wired channel 9-Base station 4-Wireless channel 12
-The mobile station 3 is connected to the communication channel, and while the mobile station 3 and the communication destination 8 are communicating, the mobile station 3 shifts from the old wireless zone 1 to the new wireless zone 2, and the exchange 6 via the base station 5. A channel switching request signal including the mobile station identification number is sent to the. [Step S8-2] When the exchange station 6 receives the channel switching request signal, the exchange station 6 determines whether or not the mobile station 3 identified by the mobile station identification number is communicating through the exchange station 6, and is already communicating. If it is, it is determined that channel switching is possible. [Step S8-3] If the result of determination is that channel switching is possible, the switching center 6 switches the communication channel connected to the base station 4 to the base station 5. As a result, the communication destination 8-communication channel 11-switching station 6-wired channel 10-
The communication channel is connected through the route of the base station 5-radio channel 13-mobile station 3 and the channel switching during communication is completed,
Communication continues.

[Step S8-4] Further, the exchange 6 determines whether or not the communication destination of the mobile station 3 is the communication destination 8. [Step S8-5] As a result of the determination, the communication destination 8 of which the communication destination of the mobile station 3 is to hold the communication channel after the communication is disconnected.
If so, the exchange 6 transmits a communication channel hold request signal to the base station 5. This signal includes communication channel information used in communication between the mobile station 3 and the communication destination 8. [Step S8-6] The base station 5 that has received the communication channel hold request signal from the exchange 6 recognizes that the wireless channel 13 is a wireless channel that needs to be held after disconnection of communication from the mobile station 3. [Step S7-7] After that, the mobile station 3
Disconnects communication. [Step S8-8] The base station 5 suspends the wired channel 10 and the wireless channel 13 used for communication between the mobile station 3 and the communication destination 8 for a certain period of time. The reserved wired channel 10 and wireless channel 13 are used only for a call request of the mobile station 3 from the communication destination 8 within a fixed time.

In FIG. 12, the exchange 6 carries out [steps S8-4] and [step S8-5] during the communication between the mobile station 3 and the communication destination 8. It may be performed at any timing from the start of switching to the disconnection of communication.

As described above, according to the seventh embodiment, the mobile station 3 that is in communication with the communication destination 8 that needs to hold the communication channel after disconnecting the communication from the mobile station 3 performs communication after switching the channel during communication. Even if the mobile station 3 is disconnected, if the communication destination 8 tries to call the mobile station 3 within a fixed time, the securing of the communication channel is guaranteed.

The channel holding time in the above third to eighth embodiments is the same as that in the second embodiment, and is arbitrarily set in consideration of various circumstances of the system configuration.

[0085]

As described above, according to the present invention, when there is an emergency communication from a mobile station and a mobile station communicating with a communication destination that needs to hold a communication channel after the communication is disconnected, Even if an attempt is made to call a mobile station from a communication destination within a fixed time, there is an effect that a communication channel is guaranteed. In addition, even when the communication channel is switched due to the transfer of the wireless zone, there is an effect that the securing of the call channel after the communication disconnection via the base station on the transfer side can be guaranteed.

Further, in any of the embodiments, since the communication channel holding function can be realized without adding any function to the mobile station side, the cost of the mobile station whose production and sales are extremely large is increased. There is an excellent effect that the mobile station can be avoided and the mobile station can be called back after the communication is disconnected only on the network side.

[Brief description of drawings]

FIG. 1 is a diagram showing a mobile communication system for explaining a conventional communication channel holding method.

FIG. 2 is a sequence chart showing a conventional communication channel holding method.

FIG. 3 is a diagram showing a mobile communication system for explaining a communication channel holding method of the present invention.

FIG. 4 is a sequence chart showing a communication channel holding method according to the first embodiment of the present invention.

FIG. 5 is a sequence chart showing a communication channel holding method according to the second embodiment of the present invention.

FIG. 6 is a sequence chart showing a communication channel holding method according to the third embodiment of the present invention.

FIG. 7 is a sequence chart showing a communication channel holding method according to a fourth embodiment of the present invention.

FIG. 8 is a sequence chart showing a communication channel holding method according to a fifth embodiment of the present invention.

FIG. 9 is a diagram showing a mobile communication system for explaining a communication channel holding method of the present invention.

FIG. 10 is a sequence chart showing a communication channel holding method according to the sixth embodiment of the present invention.

FIG. 11 is a sequence chart showing a communication channel holding method according to the seventh embodiment of the present invention.

FIG. 12 is a sequence chart showing a communication channel holding method according to an eighth embodiment of the present invention.

[Explanation of symbols]

 1, 2 Wireless zone 3 Mobile station 4, 5 Base station 6 Switching station 7 Communication network 8 Communication destination 9, 10 Wired channel 11 Communication channel 12, 13 Wireless channel

Claims (14)

[Claims] 1. A mobile communication system comprising a communication device, a base station connected to the communication device via a wireless line for communication control, and a mobile switching system connected to the base station for switching control. Whether the communication destination of the communication device requires a communication channel hold after communication disconnection from the communication device when the communication device communicates via the base station and the exchange. In the case of a communication destination that requires a communication channel hold as a result of this determination, a communication channel including communication channel information used for communication between the communication device and the communication destination with respect to the base station. A method for holding a communication channel, comprising transmitting a hold request signal to a base station. 2. A mobile communication system comprising a communication device, a base station connected to the communication device via a wireless line for communication control, and a switching center connected to the base station for switching control, the base station comprising: When the communication device communicates via a base station and an exchange, when the communication device suspends communication when a communication channel hold request signal including communication channel information transmitted from the exchange is received. A wireless channel between the base station and the communication device used for communication between the communication device and the communication destination is held for a certain period of time, and the held wireless channel is from the communication destination within the certain period of time. A communication channel holding method, which is used when there is a call request for a communication device. 3. A mobile communication system comprising a communication device, a base station connected to the communication device via a wireless line for communication control, and a mobile switching system connected to the base station for switching control. When the communication device performs communication via the base station and the switching center, whether the communication destination of the communication device requires a communication channel hold after communication disconnection from the communication device. Judgment, as a result of this judgment, in the case of the communication destination that requires the communication channel hold,
A communication channel hold request signal including communication channel information used for communication between the communication device and the communication destination is transmitted to the base station, and then, when the communication device disconnects the communication, The channel between the exchange and the base station used for communication with the communication destination is held for a certain period of time, and the base station is the communication device and the communication destination when the communication device disconnects communication. The wireless channel between the base station and the communication device used for communication is held for a certain period of time, and the held channel and the wireless channel are when a call request of the communication device is made from the communication destination within a certain period of time. A method for holding a communication channel characterized by being used. 4. A mobile communication system comprising a communication device, a base station connected to the communication device via a wireless line for communication control, and a mobile switching system connected to the base station for switching control. Includes communication channel information used for communication with a communication destination that requires communication channel hold after communication disconnection from the communication device with which the communication device is communicating via a base station and a switching center. When a communication channel hold request signal is received from the exchange, if the communication device disconnects the communication based on the communication channel hold request signal, the communication device used for communication between the communication device and the communication destination. A channel between the switching center and the base station and a radio channel between the base station and the communication device are held for a certain period of time. Communication channels reserved method characterized in that it is used when the previously a call request of the communication device. 5. A mobile communication system including a communication device, a base station connected to the communication device via a wireless line for communication control, and a mobile switching system connected to the base station for switching control, wherein the mobile switching system comprises: When the communication device performs communication via the base station and the switching center, whether the communication destination of the communication device requires a communication channel hold after communication disconnection from the communication device. Judgment, as a result of this judgment, in the case of the communication destination that requires the communication channel hold,
A communication channel hold request signal including communication channel information used for communication between the communication device and the communication destination is transmitted to a base station, and the base station performs the communication based on the communication channel hold request signal. When the device disconnects communication, the channel between the exchange and the base station used for communication between the communication device and the communication destination and the wireless channel between the base station and the communication device are held for a certain period of time. The reserved channel and the wireless channel are used when a request for calling the communication device is made from the communication destination within a fixed time. 6. A mobile communication system comprising a communication device, a base station connected to the communication device via a wireless line for communication control, and a switching center connected to the base station for switching control. Determines whether the communication destination of the communication device when the communication device communicates via the base station and the switching center is a communication destination that needs to hold a communication channel after disconnection of communication from the communication device. And the result of the judgment,
When the communication destination of the communication device is a communication destination requiring communication channel hold, a communication channel hold request signal including communication channel information used for communication between the communication device and the communication destination is sent to the base station. The base station, when receiving the communication channel hold request signal from the exchange, holds the wireless channel used for communication between the communication device and the communication destination for a certain period of time. A mobile communication system comprising means. 7. The mobile communication system according to claim 6, wherein the switching center includes means for holding a channel with the base station for a certain period of time when the communication device disconnects communication. 8. The mobile communication system according to claim 6, wherein the base station includes means for holding a channel between the exchange and the base station for a certain period of time when the communication device disconnects communication. 9. A base station, which includes a plurality of wireless zones in a service area, is installed in each wireless zone, is connected to the communication apparatus via a wireless line, and controls communication, and the base station. In a mobile communication system comprising an exchange that is connected to and performs exchange control, the exchange is communicating with a communication destination through one of the base stations while the communication device moves across a wireless zone, and While controlling the switching of the communication channel between the communication device and the exchange, it is determined whether or not the communication destination of the communication device is a communication destination that requires a communication channel hold after disconnection of communication from the communication device. As a result of the determination, in the case of the communication destination requiring the communication channel hold, the communication used for the communication between the communication device and the communication destination with respect to the base station in the movement destination wireless zone of the communication device. Communication channels reserved method characterized by sending a communication channel hold request signal including Yaneru information. 10. The service area is composed of a plurality of wireless zones, the communication device is installed in each wireless zone,
In a mobile communication system comprising a base station connected to a communication device via a wireless line for communication control, and an exchange station connected to the base station for exchange control, the exchange station is a base station When moving across a wireless zone while communicating with a communication destination via one, switching control of the communication channel between the communication device and the exchange is performed, and the communication destination of the communication device is the communication device. After disconnecting the communication from, it is determined whether or not it is a communication destination that requires a communication channel hold, and as a result of this determination, in the case of a communication destination that requires a communication channel hold, the base of the movement destination wireless zone of the communication device. When a communication channel hold request signal including communication channel information used for communication between the communication device and the communication destination is transmitted to the station, and then the communication device disconnects communication, The switching center, when the communication device disconnects communication, holds a channel between the switching center and the base station used for communication between the communication device and the communication destination for a certain period of time, When the communication device disconnects the communication, the base station in the destination wireless zone of the communication device is used for communication between the communication device and the communication destination based on the communication channel hold request signal. The wireless channel between the base station and the communication device is held for a certain period of time, and the held channel and the wireless channel are used when a call request of the communication device is made from the communication destination within a certain period of time. Communication channel hold method. 11. A service area is composed of a plurality of wireless zones, the communication device is installed in each wireless zone,
In a mobile communication system comprising a base station connected to a communication device via a wireless line for communication control, and an exchange station connected to the base station for exchange control, the exchange station is a base station When moving across a wireless zone while communicating with a communication destination via one, switching control of the communication channel between the communication device and the exchange is performed, and the communication destination of the communication device is the communication device. After disconnecting the communication from, it is determined whether or not it is a communication destination that requires a communication channel hold, and as a result of this determination, in the case of a communication destination that requires a communication channel hold, the base of the movement destination wireless zone of the communication device. To the station, transmitting a communication channel hold request signal including communication channel information used for communication between the communication device and the communication destination, the base station of the movement destination wireless zone of the communication device, When the communication device disconnects communication, the channel between the exchange and the base station used for communication between the communication device and the communication destination and the communication device based on the communication channel hold request signal. And the wireless channel between the base station and the communication device used for communication between the communication device and the communication destination is held for a certain period of time, and the held channel and the wireless channel call the communication device from the communication destination within a certain period of time. A communication channel holding method, which is used when requested. 12. The service area includes a plurality of wireless zones, and the communication device is installed in each wireless zone.
In a mobile communication system comprising a base station connected to a communication device via a wireless line for communication control, and an exchange station connected to the base station for exchange control, the exchange station is a base station A unit for controlling the switching of the communication channel between the communication device and the exchange when moving across the wireless zone while communicating with the communication destination via one, and the communication destination of the communication device is the communication destination. Means for determining whether or not the communication destination requires communication channel hold after disconnection of communication from the device, and as a result of this determination, in the case of a communication destination requiring communication channel hold, the destination wireless device of the communication device Means for transmitting a communication channel hold request signal including communication channel information used for communication between the communication device and the communication destination, to the base station of the zone, The base station of the zone is based on the communication channel hold request signal, between the base station and the communication device used for communication between the communication device and the communication destination when the communication device disconnects the communication. A mobile communication system, comprising means for holding the wireless channel of the above for a certain period of time. 13. The mobile communication system according to claim 12, wherein the switching center includes means for holding a channel with the base station for a certain period of time when the communication device disconnects communication. 14. The base station in the wireless zone to which the communication device moves includes means for holding a channel between the exchange and the base station for a certain period of time when the communication device disconnects communication. Mobile communication system.