JPH06216836A - Mobile communication system - Google Patents

Abstract

PURPOSE:To attain the movement of a portable mobile device kept in a busy mode without cutting its calling by transmitting the information on a base station to an adjacent system via a public network when the mobile device moves to an area covered by another system. CONSTITUTION:When a portable mobile device 7 which does not belong to its own system starts to leave an area covered by a radio base station 4f of a system A, the station 4f detects the reduction of reception intensity of the device 7 and reports it to a PBX 3. The PBX 3 orders the base stations 4e and 4g peripheral to the station 4f to measure the field intensity. Then the PBX 3 sends an inter-different system band-over (roaming) request to a public network if the reception field intensity is not sufficient for continuation of the communication. Thus a charging undertaker is decided by the band-over request, and a PBX 11 orders a radio base station 12h of an adjacent system B that is closest to the station 4f to measure the reception field intensity. If the field intensity is enough to start the hand-over communication, the PBX 11 sends the information on an acceptable state to the PBX 3. Thus the PBX 3 changes the speech path.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable mobile device which is connected to a base station of one system for communication and moves from the area of this system to the area of an adjacent system and is connected to the base station of the adjacent system. The present invention relates to a mobile communication system for performing communication by performing communication by means of a communication method, and in particular, it provides a system for smoothly switching (called roaming) a connected system.

[0002]

2. Description of the Related Art Systems relating to the present invention include a public system and a private system (also called a business system). The public system is a system that includes an existing public line network and is operated and managed by the same operator. In recent public systems, a base station connected to an existing public line network is provided, and a base station and a mobile body (automobile phone, mobile phone) have come to perform wireless communication. In this system, a system in which the radio coverage of the base station is small is assumed as a public system in this case. The self-employed system is, for example, a system such as a local telephone in a large business office, and is connected to a public system via a business office exchange PBX. In recent self-employed systems, a base station connected to an exchange is provided so that the base station and a slave unit (such as a mobile phone) wirelessly communicate with each other. In the present invention, such a system is assumed as a private system. In the past, when a mobile phone of a public system moved and entered the area of a private system, it was not possible to connect to the base station of the private system, but recently, a system that enables this is also proposed. It has started to be done, but it was not enough. Such a system will be described as a conventional system in the preceding stage of the present invention.

FIG. 22 is an example of a system configuration diagram showing a conventional mobile communication system. In the figure, 1 is a public network to which the mobile communication system is connected, and 2 is a business system A as the mobile communication system.
Reference numeral 3 is a private branch exchange for business establishments (hereinafter referred to as PBX for business establishments) as an exchange of the system A for business establishments, and for example, an electronic exchange device is used. 4 is PB for this establishment
Radio base stations housed in X3, each having a predetermined radio coverage area, and 5, 6 and 7 are portable mobile devices carried by a user and wirelessly connected to the radio base station. 10 is a business-use system B as a mobile communication system similar to the above-mentioned 3. 11 is a PBX for business establishments as an exchange for this business system B, and 12 is a PBX for this business establishments.
Radio base stations housed in the BX 11 and each having a predetermined radio coverage, 13 and 14 are portable mobile devices carried by a user of the business system B and wirelessly connected to the radio base station.

FIG. 23 is another example of a system configuration diagram showing a conventional mobile communication system. In the figure, 1 is shown in FIG.
Similar to the case of 2, the public network is connected to the mobile communication system, and 2 is a business system A as the mobile communication system. 3 is this business system A
In the PBX for business establishments as an exchange, 4 are radio base stations accommodated in the business PBX 3 and each have a predetermined coverage area, and 5, 6 and 7 are carried by the user to the radio base station. It is a portable mobile device that is wirelessly connected, and the system A is the same as in the case of FIG.
Reference numerals 8h and 8i denote radio base stations accommodated in the public network 1 and each having a predetermined radio coverage area. Reference numeral 9 denotes a mobile phone carried by a user of the public system and wirelessly connected to the public radio base station. It is a mobile device.

FIG. 24 is a functional block diagram showing the configuration of the portable mobile device 5. In the figure, 31 is a self-employed protocol processing unit that processes the self-employed protocols of the above-mentioned business office system A2 and system B10, and 32 is a self-employed control channel control unit that controls the self-employed control channel for transmitting this self-employed protocol. Is. Reference numeral 33 is a public protocol processing unit that processes a public protocol for the public network 1, and 34 is a public control channel control unit that controls a public control channel for transmitting the public protocol. 35
Is a transmission / reception unit that is switched and connected to the private control channel control unit 32 and the public control channel control unit 34.

FIG. 25 shows a patent application 4-265892 already filed.
It is a functional block diagram which shows the structure of the portable mobile device 7 which comprises a claim by the number "mobile communication system." In the figure, 31, 32, 33, 34 and 35 have the same functions as in FIG. In FIG. 25, two switches 36 and 37 are added to FIG. The switch 37 includes a self-employed protocol processing unit 31 that processes the self-employed protocol used in the above-mentioned business office system A2 and system B10, and a self-employed control channel control unit 32 that controls the self-employed control channel for transmitting the self-employed protocol. To switch to the public protocol processing unit 33 for processing the public protocol to the public network 1 via the switch 36. The switch 36 controls the public protocol processing unit 33 to control the public control channel for transmitting the public protocol by using the public control channel control unit 34.
This is because the connection is switched to. Reference numeral 35 is a transmission / reception unit which is switched and connected to the private control channel control unit 32 and the public control channel control unit 34.

FIG. 26 is a functional block diagram showing the relationship between the portable mobile devices 6 and 7 having the functions shown in FIG. The portable mobile devices 6 and 7 in FIG. 26 are not portable devices belonging to the system A, but belong to a public system including the public network 1 or another business office system.
When receiving a call from a portable mobile device that does not belong to system A as shown in Japanese Patent Application No. 4-265892 "Mobile communication system", a PBX that directly delivers the relevant information of the portable mobile device to the public network. It is a mobile communication system provided. Here, that the portable device belongs to a certain system means that the device number of the portable device and the number given by the operator of the system are registered in the system.

FIG. 27 is a functional block diagram of the radio base station 4 of the business-use system A2 of FIG. 26. As shown in Japanese Patent Application No. 4-265892 "Mobile communication system", a portable mobile device which does not belong to the system A. It is used in a mobile communication system equipped with a PBX that directly delivers the relevant information of (1) to the public network. Reference numeral 41 is a transmission / reception unit wirelessly connected to the transmission / reception unit 35 of the portable mobile device 7, and reference numeral 42 is a private control channel control unit for controlling the private control channel. Reference numeral 43 is a self-employed protocol processing unit that processes a self-employed protocol, 44 is a public protocol processing unit that processes a public protocol, and 45 is a line processing unit that connects to a business PBX 3.

FIG. 28 is a functional block diagram showing the configuration of the business PBX 3. In the figure, 51 is a line interface to which each of the wireless base stations 4 is connected, and 52 is a call of the portable mobile device 5 belonging to its own system or portable mobile devices 6 and 7 belonging to other business system or home portable It is a system discrimination function unit that discriminates whether the call is a mobile device. 53 is a self-system transmission unit that controls transmission when the determination result by the system determination function unit 52 is the own system, and 54 is when the determination result by the system determination function unit 52 is another system, This is another system transmission unit that transmits the transmission from the portable mobile device to the public system through the transmission. 55
Is a network interface that connects the local system transmission unit 53 and the other system transmission unit to the public network 1.

Next, the operation will be described. In FIG. 23, a connection request from the mobile mobile unit 9 to the public network 1 is processed by the public protocol processing unit 33 of each mobile unit, and directly from the transmitting / receiving unit 35 under the control of the public control channel control unit 34. Access the public network. At that time, public network 1
Performs authentication of the portable mobile device 9 and control to set the charging destination to the portable mobile device 9. The authentication is performed using the device number of the portable mobile device 9 and the number (so-called telephone number) given to the portable mobile device 9 by the operator who manages the public network 1.

On the other hand, as shown in FIG. 24, a connection request from each portable mobile unit 5 or 6 to its own system is processed by the respective own protocol processing unit 31 and sent to the own control channel control unit 32. The portable mobile device 5 is sent from the transmitting / receiving unit 35 to the wireless base station 4 existing within the coverage area thereof under the control of the private control channel control unit 32. In the wireless base station 4, the transmitting / receiving unit 41 receives it, passes it to the private protocol processing unit 43 through the private control channel control unit 42, processes it, and sends it to the business PBX 3 via the line processing unit 45.

Further, as shown in FIG. 26, the connection request to the public network 1 from the portable mobile device 7 which does not belong to the business office system A via the business office system A is as shown in FIG.
Are processed by the public protocol processing unit 33 of each mobile unit and sent to the private control channel control unit 32, and the portable mobile device 7 is controlled by the transmission / reception unit 35 by the control of the private control channel control unit 32. It is sent to the wireless base station 4 existing in the coverage area. In the radio base station 4, the transmitting / receiving unit 41 receives it, passes it to the public protocol processing unit 44 through the private control channel control unit 42, processes it, and sends it to the business PBX 3 via the line processing unit 45.

The business PBX 3 has a function of accessing only the private control channel for incoming and outgoing calls from its own system. When the connection request from each radio base station 4 is received by the line interface 51, the system It is sent to the discrimination function unit 52. The system discrimination function unit 52 determines whether the connection request is from the portable mobile device 5 belonging to the own system,
It is determined whether it is from a portable mobile device of another business system that does not belong to the own system or a portable mobile device for home use. As a result, if the connection request is from a portable mobile device that does not belong to the own system, the other system transmission unit 54 passes the connection request as it is to the public system without performing the authentication procedure. In the public system, the connection is authenticated, and at the same time, the mobile phone 7 is charged for the call charge.

On the other hand, as a result of the discrimination in the system discriminating function unit 52, if the connection request is from the portable mobile device 5 belonging to the own system, if the connection request is an intra-system connection request, the business PBX 3 Make that connection. If the request is for a connection to the public system, the local system transmission unit 53 transmits the data directly to the public network 1 via the network interface 55. If you make a call to the public network 1,
The business PBX 3 authenticates the connection to the public system, and performs the billing processing as the PBX 3 pays the call charge.

[0015] As a document describing the technology related to such a conventional mobile communication system, for example, "Second Generation Cordless Telephone System 1st Edition Standard RCR STD-2" issued by the Radio System Development Center is available.
8 ", Japanese Patent Application Laid-Open No. 2-192329 and Japanese Patent Application No. 4-265892," Mobile communication system ".

The system shown in FIGS. 22 to 28 responds to a connection request from a portable mobile device that does not belong to its own system, so that the portable mobile device moves between the private system region and the public system region. In this case, the portable mobile device can temporarily connect to a system to which it does not belong. Also, when moving between different private systems, it is possible to connect with each system for the time being. However, in the system of FIGS. 22 to 28, when switching (roaming) the system to be connected, it is necessary to disconnect the call until then and perform the connecting operation from the beginning to the system of the switching destination. That is, it is necessary to repeat the connection operation such as turning off hook or dial. The reason is that when switching the connection system, no protocol has been established as to what kind of information and how to exchange the information. Also in the conventional systems of FIGS. 22 to 28, when the portable mobile device moves from the radio area of one base station to the radio area of another base station in the same system, the base station to be connected in the same system is changed. It is supposed to switch (this is called handover),
This switching was performed smoothly without interrupting the call (to the extent that the human ear could not detect it). Of course, operations such as turning off hooks or turning dials were not necessary when switching. The reason is that, in the case of switching (handover) of base stations in the same system, a switching protocol is predetermined and prepared.

[0017]

Since the conventional mobile communication system is constructed as described above, the portable mobile device 7 wirelessly connected to the radio base station 4 in the business system A is different from the system. There was a problem that roaming could not be performed while moving to the coverage area of system B for a certain office while talking. Further, as shown in FIG. 23, even if the wireless base station of the public system is installed outside the coverage area of the business system, the coverage area of the public network system remains wirelessly connected to the wireless base station 4 of the business system A. When moving to, there was a problem that the call could not be continued.

The present invention has been made to solve the above problems, and an object thereof is to obtain a mobile communication system capable of roaming between a business system and a public system. And

[0019]

A mobile communication system according to a first aspect of the present invention provides a radio base station with a function of transmitting a protocol required for roaming through a communication channel, and an exchange is used by the radio base station to perform roaming. In the case of a mobile mobile device of another system, the information of the neighboring system of the roaming destination and the wireless connection destination wireless base station number in the neighboring system are handed over via the public network. It has the function of transmitting necessary information to the neighboring system and executing the roaming protocol.

A mobile communication system according to a second aspect of the present invention is the system of the first aspect, in which the need for roaming of a portable mobile unit whose coverage is in an adjacent system via a public network to an exchange. When the data is transmitted, the neighboring system number, the handover information such as the wireless base station number of the wireless connection in the neighboring system and the information necessary for roaming such as the subscriber telephone number of the portable mobile device are received from the neighboring system, and the public network is received. Is provided with a function of transmitting handover acceptance permission information.

Further, in the mobile communication system according to the invention described in claim 3, the coverage area of the own system is in a state where the portable mobile unit belonging to the own system is talking to the telephone connected to the public network. When roaming to the wireless base station of the adjacent system from the local system, the exchange of the local system passes through the public network and the handover information of the adjacent system number, the wireless base station number such as the wireless base station number of the wireless connection in the adjacent system, and the portable mobile device. It is provided with a function of transmitting information necessary for roaming, such as a subscriber telephone number and a billing party number for the call, to an adjacent system.

In the mobile communication system according to the invention described in claim 4, a portable mobile device belonging to a system to which the mobile communication system belongs belongs to a telephone set connected to the system or connected to the system. When trying to roam to another adjacent system while another mobile mobile device wirelessly connected to the wireless base station is in a call, the exchange of the system concerned charges the billing information of its own system, that is, the billing When the system bears the system roaming information such as system number and the charging destination is changed to the portable mobile device, the roaming information such as the charging information of the portable mobile device and the wireless in the adjacent system that is the roaming destination The roaming-destination system handover information, such as the connection-destination wireless base station number, is sent via the public network to which the system to which the user belongs belongs is connected. Transmitted to the contact system, but have a function to carry out the procedure of line setting to the adjacent system is a roaming to the public network.

The mobile communication system according to the invention of claim 5 is other than the portable mobile device and telephone which belong to the system to which the portable mobile device belonging to the system to which the mobile communication system belongs is connected. When an attempt is made to roam from the adjacent system to the own system while the call is being made, the exchange belonging to the system to which the own system belongs receives the information necessary for roaming from the exchange of the adjacent system, and the roaming and handover protocol ends. Has a function of notifying the public network that the charging destination is changed from the portable mobile device to its own system.

A mobile communication system according to a sixth aspect of the present invention is a telephone in the own system or a portable mobile device belonging to the own system and located in the own system from an adjacent system via a public network. When roaming from the adjacent system to the coverage area of the wireless base station of the own system while the mobile mobile device of the own system is in a call, the information necessary for roaming is received from the exchange of the adjacent system, and the roaming and handover protocol is When completed, the line between the system and the public network is disconnected and the function of switching to the extension in the system is provided.

In the mobile communication system according to the seventh aspect of the present invention, a portable mobile unit belonging to its own system is in a call with another portable mobile unit within its own system and belongs to its own system. When the mobile mobile device roams to the adjacent system, when the charging destination is designated to the own system according to claim 4, the exchange belonging to the own system is the mobile mobile device belonging to the own system where the original charging destination roamed. Then, when the portable mobile device of the other party of the call roams to the adjacent system, the charging destination for the public network is changed from the own system to the portable mobile device belonging to the first system that roamed. It has a function of issuing instructions to the public network.

[0026]

In the mobile communication system according to the present invention, the portable mobile device roams from the system to an adjacent private system or public system while continuing a call with a telephone connected to the public network. It is possible to do.

In the system according to the second aspect of the invention, the portable mobile device roams from the adjacent private system or public system to the system while continuing the call with the telephone connected to the public network. It is possible to do.

In the mobile communication system according to the third aspect of the present invention, a portable mobile device belonging to a system belonging to the mobile communication system continues to talk to a telephone connected to the public network, and is adjacent to the system and operated independently. It is possible to roam to a public or public system.
In that case, the system can be changed to a mobile device that roams the charging load.

Further, in the system according to the invention described in claim 4, a portable mobile device belonging to a system belonging to itself, while continuing a call with a telephone connected to the system, is a self-employed company adjacent to the system. It is possible to roam to a public or public system. In that case, it is possible to use a mobile device that roams the charging load or the system.

In the system according to the invention described in claim 5, the portable mobile device belonging to the system belonging to itself is connected to the system, and talks with other than the portable mobile device and the telephone belonging to the system. It is possible to change the charging destination from the portable mobile device to the system by roaming from the adjacent system to the own system while keeping the inside.

A system according to a sixth aspect of the present invention belongs to the system to which the system belongs, and the system in the neighboring system is connected to the telephone set in the own system or the portable mobile unit via the public network while the call is being transmitted from the adjacent system. When roaming to the system, it is possible to disconnect the line from the public network and switch the call to the extension line.

In the system according to the seventh aspect of the present invention, the portable mobile unit belonging to its own system is in a call with another portable mobile unit within its own system and the portable mobile unit belonging to its own system. The aircraft roams to an adjacent system. According to the fourth aspect, when the mobile phone of the other party of the call roams to the adjacent system after designating the charging destination to the own system, it is possible to clarify the charging destination to be charged originally.

[0033]

EXAMPLES Example 1. Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 is a system configuration diagram showing the overall configuration of a mobile communication system according to the present invention, and FIG. 2 is a system B.
Is a public network, FIG. 3 shows a subscriber connected to the public network 1 by wirelessly connecting a portable mobile device not belonging to the private system A to the wireless base station 4f of the system A. While talking to 13 (14a indicates this call path), move to the coverage area of the base station of private system B, and when the roaming protocol ends, handover to private system B is completed, and the call path 14a is disconnected and the call path 14b is established. FIG. 4 shows a handover when the system B is a public network, and the call path 15a is switched to the call path 15b by the handover. FIG. 5 shows a layout of base stations in the boundary area between the private systems A and B, and FIG. 6 shows a case where the system B is a public network. Figure 7
Shows an inter-system handover sequence such as systems A and B. FIG. 8 shows the protocol sequence, and FIG. 9 shows the information elements used in the protocol.

In FIG. 1, 6 is a portable mobile device belonging to another business system, and 7 is a home portable mobile device belonging to a public system, both of which are the business system A2.
It is a portable mobile device that does not belong to. Reference numeral 4 is a radio base station of system A, and 3 is an exchange. Reference numeral 12 is a radio base station of the system B10, and 11 is its exchange. The exchanges 3 and 11 are connected to the public network 1. 2 shows a case where the system B in FIG. 1 is a public network, and 8 is a public wireless base station, which is directly connected to the public network 1. FIG. 3 shows the portable mobile device 7 of FIG.
Shows a state in which handover and roaming are simultaneously performed from system A2 to system B11, 14a shows the original call path, and 14b shows the call path after handover & roaming. FIG. 4 shows a state in which the system B of FIG. 1 is simultaneously performing handover and roaming in the case of a public network. 15a shows the original call path, and 15b shows the call path after handover & roaming. FIG. 5 shows an arrangement example of radio base stations in the boundary area between the private systems A and B, and FIG. 6 shows an arrangement example of base stations when the system B is a public system. FIG. 7 shows an example of a handover sequence in the case of the first embodiment. FIG. 8 shows a protocol sequence, and FIG. 9 shows information elements that each sequence in the protocol should have. Although an example of a protocol between systems is shown here, as for the wireless section between the portable mobile device and the wireless base station, for example, "Second Generation Cordless Telephone System 1st Edition Standard RCR ST"
D-28 "(hereinafter referred to as RCR STD-28) is a typical example.

Next, the operation will be described. In FIGS. 1 and 3, the portable mobile device 7 that does not belong to its own system is a system A.
When the base station 4f begins to move away from the coverage area of the wireless base station 4f, the base station 4f "detects a decrease in the reception intensity of the mobile station 7" as shown in the processing content 21a of the flowchart of FIG. Send the report. The PBX 3 which has received the reception strength report is from the base station arrangement of the system A shown in FIG. 5 to the base stations 4e and 4g around the base station 4f of the own system,
The electric field strength of the mobile device 7 is measured as shown in the processing content 21c of the flowchart of FIG. The processing content 21d of the flowchart indicates that the PBX 3 determines whether or not to continue communication in the system A, based on the electric field strength measurement result of the mobile device 7 measured by the base stations 4e and 4g. The processing content 21e of the flowchart means that the received electric field strength is sufficient, and communication is continued in the system. The branch to the processing content 21f of the flowchart is that the reception electric field strength of the wireless base station in the system is not sufficient for communication continuation. Means that. The processing content 21f of the flowchart means the start of the inter-system handover (roaming), which corresponds to the "handover request" 22b in the sequence of FIG. 8 and is transmitted from the PBX 3 of the system A to the public network. An example of the contents of information accompanying the handover request 22b is shown by the circles in the examples 23c to 23m of 23a in FIG. As indicated by 23f and 23j in the example of 23a in FIG. 9, the "handover request" determines the charge acceptance destination (determines who pays the charge). The circles in FIG. 9 indicate the information used in each protocol. The portable mobile device 7 is a system A
Since it does not belong to the charging system A, it is not charged to the charging system A. However, in the system B, whether the charging destination (charge charging party) is the portable mobile device 7 or the call partner, Whether or not B is the system to which the portable mobile device 7 belongs is known from "presence / absence of billing underwriting of PS" shown in 23f and "necessity of billing undertaking at roaming destination" shown in 23j of FIG. The processing content 21f of the flowchart instructs the radio base station 12h of the adjacent system B closest to the base station 4f of the system A so that the PBX 11 of the system B measures the received electric field strength. When the measurement result indicates that the electric field strength is sufficient to start the handover communication, the PBX 11 of the system B transmits the “handover acceptance / non-permission information” 22f to the PBX 3 of the system A via the public network 1. When the PBX 3 of the system A receives the acceptance of the handover acceptance, the call path of FIG. 3 is changed from 14a to 14b by changing the connection destination of the line.
In the sequence diagram 8, the call is synchronous burst 22.
It continues until just before h. By carrying out the sequence and transmission of protocol information shown in FIGS. 7, 8 and 9, the call disconnection period during roaming shown in 22g of FIG. 8 can be made unnoticeable to the human ear, so the call was continued. You can still roam. The portable mobile device 7 does not need to perform a connection operation such as off-hook dialing when switching between the systems A and B.

In FIGS. 1 and 3, the portable mobile device 7 is a system A.
Although the case of roaming from the system to the system B is shown, the case of roaming from the system B to the system A on the contrary is similarly performed by the sequence of FIGS. 7 and 8. That is, in FIG. 7, the base station 4f of the system A, the PBX 3, the adjacent base station 4e,
4g may be replaced with the base station 12h, PBX11, and adjacent base station 12i of the system B. Further, the system A, the system B-PBX, and the base station 12h in FIG. 8 may be replaced with the system B, the system A-PBX, and the base station 4f. This corresponds to claim 2.

Example 2. An embodiment corresponding to claim 3 will be described with reference to FIGS. 10, 11, 12, and 13. In the second embodiment, roaming is realized by transmitting the protocol information and the sequences shown in FIGS. 12 and 13 similar to the first embodiment. Unlike the case of FIG. 1, the portable mobile device 7 of FIG. 10 belongs to the self-employed system A. When the call origination is the portable mobile device 7, the “handover request” of the first embodiment is shown in FIG.
"PS (PS stands for Portable Station) billing number" shown in 25m is added. “The circles in FIG. 13 represent the information used in steps 25a and 25b in the protocol. When the“ handover acceptance availability information ”24f reaches the system A,
By changing the connection destination of the line, the call path 16a in FIG. 10 is changed to 16b. The measurement of the electric field of the portable mobile device 7 and the determination of the handover are performed in the same manner as in FIG.

Example 3. In the above-described first and second embodiments, the case where the call partner is connected to the public network (13 in FIG. 10) has been described. However, the call partner of the mobile mobile device 7 is a telephone or a mobile phone included in the system A2. The machine 5 is also possible, and one embodiment of such an invention described in claim 4 will be described below with reference to FIGS. 14 to 16.

The portable mobile device 7 belonging to its own system
The portable mobile device 7 roams to the adjacent system B in a state in which the portable mobile device 7 is in a call with the telephone connected to the PBX 3 belonging to the system or the mobile mobile device 5 wirelessly connected to the wireless base station 4 connected to the PBX 3. In the case of FIG.
As shown in FIG. 16, the PBX 3 of the system A sets up a call with respect to the public network 1 and sets up a line with the PBX 11 of the system B. The PBX 11 establishes a wireless line with the portable mobile device 7 via the wireless base station 12h by the sequence of FIG. 16 and the transmission of the protocol information of FIG. Thus, the call is started on the new line 18b. Portable mobile device 7
The electric field measurement and the handover decision are performed in the same manner as in FIG.

As shown in FIG. 15, the same applies when the private system B of the third embodiment is a public network. The portable mobile device 7 belonging to the self-employed system A roams to the public system while maintaining a call with another portable mobile device 5 in the system, and the call route is changed from 19a to 19b.

Example 4. The operation of claim 5 will be described. In FIG. 17, a portable mobile device belonging to system A
5b is the system A from the adjacent system B via the public network.
It is connected to a portable mobile device 6 that does not belong to system A inside. An example of a case where the portable mobile device 5b roams from the system B to the own system A from this state will be shown. When the portable mobile device 5b starts to move away from the coverage area of the wireless base station 12h in the system B, the wireless base station 12h transmits a reception strength report to the exchange 11 of the private system as shown in sequence FIG. The exchange 11 causes the wireless base stations belonging to its own system around the wireless base station 12h to measure the electric field strength of the mobile station 5b,
Report the field strength measurement results. Switch based on measurement results
It is determined whether 11 continues the communication in the system B. When it is determined that the received electric field strength in the system is not sufficient for continuing communication, a request for handover is transmitted to the public network, and the received electric field strength is measured at the wireless base station 4f of the system A closest to the wireless base station 12h. Give instructions to do so. When the measurement result shows that the electric field strength is sufficient for starting handover communication, the PBX 3 of the system A transmits the handover acceptability information to the exchange 11 of the system B via the public network. When the line is set up between the wireless base station 4f and the portable mobile device 5b, the wireless base station 4f transmits the call setting to the exchange 3,
Upon receipt of this, the exchange 3 confirms that the roaming portable mobile unit 5b belongs to its own system and confirms that the communication partner is not a portable mobile unit belonging to its own system in its own system and sets up a call on the public network. At the same time, an instruction to change the charging destination (charge billing destination) from the portable mobile device 5b to the system A is transmitted.

Example 5. The operation of claim 6 will be described. In FIG. 19, a portable mobile device belonging to system A
5b is the system A from the adjacent system B via the public network.
It is connected to the portable mobile device 5a belonging to (1) by a route 16b. When the portable mobile device 5b starts to move away from the coverage area of the wireless base station 12h in the system B, the wireless base station 12h starts the sequence diagram 2
As shown by 0, the reception strength report is transmitted to the exchange 11 of the system B. The exchange 11 causes the radio base stations belonging to its own system around the radio base station 11h to measure the electric field strength of the portable mobile device 5b and report the electric field strength measurement result. Based on the measurement result, it is determined whether the exchange 11 continues the communication in the system B. When it is determined that the received electric field strength in the system is not sufficient for continuing communication, a request for handover is transmitted to the public network, and the received electric field strength is measured at the wireless base station 4f of the system A closest to the wireless base station 12h. Give instructions to do so. When the measurement result shows that the electric field strength is sufficient for starting handover communication, the PBX 3 of the system A transmits the handover acceptability information to the exchange 11 of the system B via the public network. When the line is set up between the radio base station 4f and the mobile mobile device 5b, the radio base station 4f transmits the call setting to the exchange 3, and the exchange 3 receiving the call setup recognizes the mobile mobile device 5b roaming itself. It determines that it belongs to the system and that the other party is a telephone that belongs to its own system, and sends a call setting acceptance to the radio base station 4f, sends disconnection to the public network, disconnects the line with the public network, and then extends the extension. Switch to.

Example 6. The operation of claim 7 will be described. In FIG. 21, the operation after this will be described by taking as an example the case where the portable mobile device belonging to system A in claim 4 roams from system A to the public network by designating the charging destination to system A. When the mobile mobile device 5 belonging to the system A is connected to the mobile mobile device 6 in the system A through the call path of 16a, the mobile mobile device 5 connects to the wireless base station 8 to roam to the public network and to be charged. Is designated as system A and the communication path is switched to 16b. At this time,
The exchange 3 of the system A remembers that the original billing destination is the portable mobile device 5, and then the portable mobile device 6 of the other party talks to the wireless base station of the system B away from the coverage area of the wireless base station 4f. When trying to roam to 12h, the charging destination is specified to the mobile mobile device 5 as information necessary for roaming.
After this, the call path is
Switch to c.

The internal circuit of the mobile portable device in each of the above embodiments is the same as that shown in FIGS. Also,
The internal circuits of the base station and the exchange of each embodiment are the same as those shown in FIGS. 36 and 37, respectively.

[0045]

As described above, according to the first aspect of the present invention, when a portable mobile unit in a call in a private system moves to a coverage area of a base station of another adjacent system, the adjacent By transmitting system base station information or information such as billing to an adjacent system via a public network, there is an effect that a mobile communication system capable of moving without disconnecting a call can be obtained.

According to the second aspect of the present invention, when the portable mobile unit in a call with another adjacent system moves to the coverage area of the wireless base station of the system, the call is not interrupted. There is an effect that a mobile communication system capable of continuing a call by using the radio base station of the system can be obtained.

According to the third aspect of the present invention, when the charging of the portable mobile device similar to that of the first aspect is the system concerned, after moving to an adjacent system, the charging destination is moved from the system concerned to the portable phone. There is an effect that a mobile communication system that can be changed to a machine can be obtained.

According to the invention described in claim 4, there is an effect that a mobile communication system can be obtained in which the portable mobile unit can move to an adjacent system while continuing a call with a mobile unit or a telephone belonging to the system. is there.

According to the invention described in claim 5, the charging destination of the portable mobile device belonging to the system moving from a different adjacent system to the system can be changed from the portable mobile device to the system. effective.

According to the invention described in claim 6, when the portable mobile device belonging to the system moves from the adjacent system while continuing the call with the mobile device belonging to the system or the telephone, There is an effect that a mobile communication system in which the call can be used as an extension connection can be obtained.

According to the invention of claim 7, the portable mobile device belonging to the system that has moved to a different adjacent system is in communication with the portable mobile device of the call partner in the system while the mobile device of the call partner is being used. When the mobile device also moves to another adjacent system, even if the charging destination is not the mobile mobile device that moved later, the effect that the charging destination can be changed from the system to the mobile mobile device belonging to the system that moved first is there.

[Brief description of drawings]

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

FIG. 2 is a functional block diagram showing a case where a private system B in the above embodiment is a public network.

FIG. 3 is a functional block diagram showing a change state of a call route in the above embodiment.

FIG. 4 is a functional block diagram showing a change to a public network in the above embodiment.

FIG. 5 is an explanatory diagram showing an example of arrangement of wireless base stations in a boundary area between adjacent systems in the above embodiment.

FIG. 6 is an explanatory diagram showing an example of arrangement of wireless base stations in a boundary area between a public network and an adjacent self-employed system in the above embodiment.

FIG. 7 is a flowchart diagram showing handover of the mobile communication system according to the first embodiment.

FIG. 8 is a sequence diagram showing handover of the mobile communication system according to the first embodiment.

FIG. 9 is a diagram showing protocol information types included in a sequence showing handover of the mobile communication system according to the first embodiment.

FIG. 10 is a functional block diagram showing a change state of a call route according to the second embodiment.

FIG. 11 is a functional block diagram showing a change to a public network in the second embodiment.

FIG. 12 is a sequence diagram showing handover of the mobile communication system according to the second embodiment.

FIG. 13 is a diagram showing protocol information types included in a sequence showing handover of the mobile communication system according to the second embodiment.

FIG. 14 is a functional block diagram showing a change state of a call route according to the third embodiment.

FIG. 15 is a functional block diagram showing a change to a public network in the third embodiment.

FIG. 16 is a sequence diagram showing handover of the mobile communication system according to the third embodiment.

FIG. 17 is a functional block diagram showing a changed state of a call route according to the fourth embodiment.

FIG. 18 is a sequence diagram showing handover of the mobile communication system according to the fourth embodiment.

FIG. 19 is a functional block diagram showing a changed state of a call route according to the fifth embodiment.

FIG. 20 is a sequence diagram showing handover of the mobile communication system according to the fifth embodiment.

FIG. 21 is a functional block diagram showing a change state of a call route according to the sixth embodiment.

FIG. 22 is a system configuration diagram showing an overall configuration of a mobile communication system according to a conventional example.

FIG. 23 is a system configuration diagram showing an overall configuration of a mobile communication system according to a conventional example.

FIG. 24 is a block diagram showing functions of the portable mobile device 5 shown in the embodiment.

FIG. 25 is a block diagram showing functions of the portable mobile device 7 shown in the embodiment.

FIG. 26 is another functional block diagram showing a conventional example.

FIG. 27 is a block diagram showing functions of a radio base station of a mobile communication system according to a conventional example.

FIG. 28 is a block diagram showing functions of a PBX of a mobile communication system according to a conventional example.

[Explanation of symbols]

 1 Public network 2 Private system A 3 Switch of private system A 4 Radio base station 5 Mobile mobile device 6 Portable mobile device 7 Portable mobile device 8 Radio base station 10 Private system B 11 Private system B switch 12 Radio base station 13 Public network Phone connected to

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaaki Nemoto 5-1-1 Ofuna, Kamakura City Mitsubishi Electric Corporation

Claims (7)

[Claims] 1. A self-employed system comprising a plurality of radio base stations and an exchange connected to these radio base stations; a system adjacent to the self-employment system comprising a plurality of radio base stations; A mobile communication system including: a system switch and a public network connected to the adjacent system; and a mobile mobile device wirelessly connected to the wireless base station of the private system and the wireless base station of the adjacent system, The machine moves from the radio coverage of the radio base station of the private system to the radio coverage of the radio base station of the adjacent system during a call with the telephone connected to the public network via the private system. At this time, the exchange transmits the roaming destination information including the information of the own system and the radio base station number in the adjacent system to the public network. Mobile communication system. 2. A self-employed system including a plurality of radio base stations and an exchange connected to these radio base stations, a system adjacent to the self-employment system including a plurality of radio base stations, and the self-employed system. Mobile system wirelessly connected to a switch of a mobile system and a public network connected to the adjacent system, and a mobile mobile station wirelessly connected to a wireless base station of the private system and a wireless base station of the adjacent system, When the mobile device moves from the wireless coverage area of the wireless base station of the adjacent system to the wireless coverage area of the wireless base station of the private system during a call with the telephone connected to the public network via the adjacent system. , Roaming information including information about the portable mobile device and the number of a wireless base station in the adjacent system that covers the portable mobile device as a wireless coverage area. A mobile communication system, which transmits from a system to a switch of the private system via the public network. 3. The mobile communication system according to claim 1, wherein the portable mobile device belongs to a self-employed system, and when the charge destination of the call charge before moving is the self-employed system, the charge destination is set. A mobile communication system characterized in that a mobile mobile device billing number, which is changed to a mobile mobile device after moving, is transmitted from an exchange of a private system to a public network. 4. A self-employed system comprising a plurality of radio base stations and an exchange connected to these radio base stations, a system adjacent to the self-employment system comprising a plurality of radio base stations, and the self-employed system. A mobile network belonging to the private system and wirelessly connected to the wireless base station of the private system and the wireless base station of the adjacent system. In the communication system, while the portable mobile device is in a call with a telephone or another portable mobile device in the private system, the wireless coverage of the wireless base station of the private system to the wireless coverage of the wireless base station of the adjacent system. When moving to, when the billing destination after moving is still the self-employed system, the self-system information and the billing number that makes the billing destination the self-employment system When transmitting from the exchange to the public network and changing the billing destination after moving to the mobile portable device that has moved, the mobile mobile billing number together with the number of the wireless base station of the roaming destination from the exchange to the public network A mobile communication system characterized by transmitting. 5. A self-employed system comprising a plurality of radio base stations and an exchange connected to these radio base stations; a system adjacent to the self-employment system comprising a plurality of radio base stations; A mobile network including: a switch of the system and a public network connected to the adjacent system; and a portable mobile device that belongs to the private system and wirelessly connects to the wireless base station of the private system and the wireless base station of the adjacent system. In the communication system, the portable mobile device is in a radio coverage area of the wireless base station of the private system during a call with another portable mobile device or a telephone not belonging to the private system via a wireless base station of the adjacent system. When moving to a mobile mobile device, the charge destination before the move is a portable mobile device. Mobile communication system, characterized by transmitting to the exchange of the private system and information and number of the radio base station of the private system from the adjacent system via the public network. 6. A self-employed system including a plurality of radio base stations and an exchange connected to these radio base stations, a system adjacent to the self-employment system including a plurality of radio base stations, and the self-employed system. And a public network connected to the adjacent system, and a portable mobile device that belongs to the private system and wirelessly connects to the wireless base station of the private system and the wireless base station of the adjacent system. In a mobile communication system, when the portable mobile device is in a call with another portable mobile device or a telephone connected to the private system via a wireless base station of the adjacent system, the wireless coverage of the wireless base station of the private system is lost. When moving to the area, the exchange of the self-employed system uses the information about the portable mobile device that moves from the public network and the number of the radio base station of the self-employed system. Mobile communication system, which disconnects the connection with the public network and switches to extension communication in a private system. 7. A self-employed system comprising a plurality of radio base stations and an exchange connected to these radio base stations, a system adjacent to the self-employment system comprising a plurality of radio base stations, and the self-employment system Mobile communication including: a switch of the system and a public network connected to the adjacent system; and a portable mobile device that belongs to the private system and wirelessly connects to the wireless base station of the private system and the wireless base station of the adjacent system. In the system, the portable mobile device moves to a wireless coverage area of a base station of the adjacent system during a call via another portable mobile device or a telephone connected to the private system and a wireless base station of the private system. , When the billing destination after moving is a mobile wireless device that has moved, and then the other party also moves to the wireless coverage area of the base station of the adjacent system, Above mobile communication system, characterized by transmitting the information to remain portable wireless device has moved first from the exchange to the public network.