JP2001268227A - Call control / management method in mobile phone system - Google Patents

Abstract

(57) [Summary] A mobile phone system that enables a call transfer service and a representative number reception service to be realized by managing a call connection state of a terminal station in an external server provided in the mobile phone system. Provides a call control / management scheme in the system. An SCP (Service Control Station) serving as an external server determines whether a plurality of PSs (terminal stations) serving as mobile terminals are currently in a busy state during a call or in an idle state without a call. A call connection state storage device,
When a call is made to designate any one of the plurality of PSs as a destination, the call connection state of the destination PS is changed to:
Connection determination means for determining by referring to the call connection state storage device, determining whether to change the destination of the call according to the result of the determination, and connecting the call.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a call control / management system in a portable telephone system, and more particularly to an external server provided in the portable telephone system, which manages a call connection state of a terminal station so as to provide a busy transfer service and a representative service. The present invention relates to a call control / management method in a mobile phone system, which is capable of realizing an incoming call service.

[0002]

2. Description of the Related Art In recent years, telecommunications carriers that provide services such as telephone communications have been developing intelligent networks (Intelligent Networks: IN) in order to provide various network services flexibly and quickly.
Has been building a network called.

[0003] In the IN, a plurality of service switching centers (Service Switchi) accommodating subscriber terminals.
ng Point: SSP), and an external server which is a computer having a database is installed independently of the switching network, and the external server controls network services. This external server is usually provided by a service control point (Service Control Point).
t: SCP), when an IN service request is received from an SSP or the like, a process corresponding to the IN service request is performed, and an instruction corresponding to the processing result is sent to the SSP.
And the SSP performs an operation according to the instruction, thereby realizing the IN service. For example, a typical I
In the toll-free N service, the SCP with the database function converts the number between the toll-free number and the actual telephone number, and instructs the SSP to connect to the actual telephone number. , A free dial (registered trademark) service is realized.

In addition, PHS (Personal Han)
Dyphone System (personal handy phone system) is also one of the typical network services using IN technology. SSP provides advanced network-wide service control functions such as number translation and location information management.
The SCP is an external server provided separately.

[0005]

SUMMARY OF THE INVENTION The above-mentioned conventional PHS
In, an individual SCP is usually provided for each communication carrier, and a unique network service is provided for each communication carrier.

[0006] However, in the case of a telecommunications carrier that does not have a self-owned switching network, such as a network-utilizing PHS carrier, a connection service from a calling subscriber terminal to a called subscriber terminal is provided. Is performed as usual, but the call connection of the called subscriber terminal, such as whether the called subscriber terminal is currently busy and busy, or whether the called subscriber terminal is idle and not talking. Since the state management is not performed, it is impossible to realize a busy transfer service, a representative number reception service, and the like.

[0007] It is an object of the present invention to provide a portable telephone system capable of realizing a busy transfer service and a representative number receiving service by managing the call connection state of a terminal station in an external server provided in the portable telephone system. The present invention provides a call control / management method in the above.

[0008]

A call control / management system in a portable telephone system according to the present invention uses an SCP (Service Control) for controlling a network service.
l Point: In a mobile phone system provided with a service control station, a plurality of PSs (Per
The SCP stores a call connection state storage device indicating whether the terminal is in a busy state during a call or in an idle state without a call.
When a call for designating any one of the plurality of PSs as a destination is made, the call connection state of the destination PS is determined by referring to the call connection state storage device. The SCP further includes connection destination determination means for determining whether to change the destination of the call according to the result of the determination and connecting the call.

[0009] The call connection status storage device may further include a subscriber terminal number portion indicating a plurality of PS terminal numbers, and whether the PS described in the subscriber terminal number portion is currently in a call and busy. Alternatively, if a call state part indicating a call connection state indicating whether the telephone is idle and not in a call state, and the PS described in the subscriber terminal number part is busy, the P
And a busy-time transfer destination unit indicating a transfer destination terminal number for transferring an incoming call to S to another PS.

[0010] Further, when a call for designating a certain PS as a destination is made, the connection destination determining means stores the terminal number of the destination PS in the subscription of the call connection status storage device. The call connection status of the destination PS is determined by referring to the call status portion of the call connection status storage device. If the result of the determination is idle, the call termination status is determined. The call is connected to the destination PS, and if the result of the determination is busy, it is determined whether the transfer destination for transferring the call is described in the busy-time transfer destination section of the call connection state storage device. A transfer destination determination is executed, and when the transfer destination is described as a result of the transfer destination determination, the call is transferred and connected to the PS described in the busy-time transfer destination section, and transferred as a result of the transfer destination determination. When the destination is not described, the operation of disconnecting the call is performed. And wherein the door.

The connection destination determining means receives control information including call information when a call for designating a certain PS as a destination is made (S1); Searching for the terminal number of the PS by searching the subscriber terminal number section of the call connection state storage device, and determining the call connection state of the destination PS by referring to the call state section (S2). If the result of the determination in step S2 is idle, the step of connecting the call to the destination PS (S3), and the call connection status of the calling terminal station and the call status part of the destination PS are busy. (S4),
A step of determining the end of the call (S5);
If the call is not completed in the determination of step 5, the step S5 is repeatedly executed, and when the call is completed in the determination of step S5, the call connection state of the calling state unit of the calling terminal station and the destination PS. Is executed (S6) to disconnect the call (S7). If the result of the determination in step S2 is busy, the transfer destination PS of the destination PS is described in the busy transfer destination section. Step (S10) for determining whether there is a call, and if the result of the determination in step S10 is not described, the call is disconnected (S11). If the result of the determination in step S10 is described, then the call is terminated. A step (S12) of determining the call connection state of the transfer destination PS by referring to the call state section, and a step of connecting the call to the transfer destination PS if the result of the determination in step S12 is idle (S14). )When, The step of the call connection state of the call state of the call source terminal station and said destination PS busy (S1
5) and a step of determining the end of the call (S16);
If it is determined in step S16 that the call is not terminated, step S16 is repeatedly executed. When the call is terminated in step S16, the call connection between the calling terminal station and the call state part of the transfer destination PS is performed. A step of setting the state to idle (S17) is performed to disconnect the call (S18), and if the result of the determination in step S12 is busy, a step of disconnecting the call (S13) is performed. .

[0012] Further, the call connection status storage device may further include a subscriber terminal number part indicating the terminal numbers of the plurality of PSs, and whether the PS described in the subscriber terminal number part is currently in a call and busy. Alternatively, a call status portion indicating a call connection status indicating whether the mobile terminal is idle and not in a call, and when the PS described in the subscriber terminal number portion is in a busy status, another call is received by the PS. Any one of multiple N PSs
And a plurality of N busy-time transfer destinations indicating transfer destination terminal numbers for transfer to the destination.

The connection destination determining means, when a call for designating a certain PS as a destination is made, stores the terminal number of the destination PS in the call connection state storage device in the subscription. The call connection status of the destination PS by referring to the call status portion of the call connection status storage device. If the result of the determination is idle,
If the call is connected to the destination PS and the result of the determination is busy, the transfer destination for transferring the call is described in the plurality of N busy destinations of the call connection state storage device. Performing a transfer destination determination to determine whether or not the transfer destination is described in any of the plurality of N busy transfer destination units as a result of the transfer destination determination. The destination P is described in any one of the
The call is transferred and connected to the PS in which the call connection state of S is idle, and when the transfer destination is not described as a result of the transfer destination determination, or when the plurality of N busy destinations are described. When all of the certain PSs are in a busy state, an operation of disconnecting the call is performed.

Further, the connection destination determining means receives control information including call information when a call for designating a certain PS as a destination is made (S1); Searching for the terminal number of the PS by searching the subscriber terminal number section of the call connection state storage device, and determining the call connection state of the destination PS by referring to the call state section (S2). If the result of the determination in step S2 is idle, the step of connecting the call to the destination PS (S3), and the call connection status of the calling terminal station and the call status part of the destination PS are busy. (S4)
And a step (S5) of judging the end of the call. If the call is not ended in the judgment of the step S5, a step S5
Is repeatedly executed, and when the call is terminated in the determination of step S5, the step (S6) of setting the call connection state of the calling state section of the calling terminal station and the called state section of the called destination PS to idle is executed, and (S7), and if the result of the determination in step S2 is busy, a step of determining whether or not the transfer destination PS is described in the plurality of N busy destinations of the destination PS (step S7). S10), if the result of the determination in step S10 is not described, the call is disconnected (S11). If the result of the determination in step S10 is described, the call connection status of the transfer destination PS is changed to A step (S12) of making a determination with reference to the call state part; a step (S14) of connecting the call to the transfer destination PS if the result of the determination in the step S12 is idle; The call of the transfer destination PS The step (S15) of making the call connection state of the state part busy, the step (S16) of judging the end of the call, and the step S16 if the call is not ended in the judgment of the step S16. When the call is terminated in the determination of S16, the step (S17) of setting the call connection state of the calling state section of the calling terminal station and the transfer destination PS to idle is executed to disconnect the call (S1).
8) If the result of the determination in step S12 is busy, a step of determining whether or not the next transfer destination PS is described in the plurality of N busy transfer destinations of the destination PS (step S12). S20), if the result of the determination in step S20 is not described, the call is disconnected (S13), and step S2 is performed.
If the result of the determination of 0 indicates that there is a description, the next transfer destination PS is set as the transfer destination PS, and the process returns to step S12 to enable the transfer to be performed.
Executing a step of searching for.

[0015]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a call control / management system in a portable telephone system according to the present invention.

In the present embodiment shown in FIG. 1, a plurality of service exchanges (Service Sw
Switching network 1 including switching point (SSP)
And an SCP (Service) as an external server having a database connected to the switching network 1 independently of the switching network 1
ce Control Point (service control station)
2, a CS (Cell Station: base station) 4 for a plurality of mobile phone services connected to the switching network 1,
Multiple PSs as mobile terminals for wireless communication with CS4
(Personal Station: terminal station) 5;
It comprises a plurality of fixed telephones 6 connected to the switching network 1.

Although SCP2 has a database,
In particular, it has a state storage unit 3 for managing the call connection states of a plurality of PS5s. The state storage unit 3 stores a subscriber terminal number 31 indicating the terminal number of the PS 5 and a subscriber terminal number 3
A call state 32 indicating whether the subscriber terminal described in No. 1 is currently busy during a call, or not performing a call and in an idle state, and a subscriber terminal described in the subscriber terminal number 31 Is busy, the transfer destination 33 indicates the subscriber terminal number of the transfer destination that transfers the destination to another PS5. SCP2
Terminal number 31 of the state storage unit 3 in the database of
The busy destination 33 can be registered by a registration unit (not shown).

In FIG. 1, CS4 is composed of CS4-1, CS4-2, and CS4-3 for simplicity of explanation, and PS5 is a PS5-1 that performs radio communication with CS4-1. , Which performs wireless communication with CS4-2, and PS5-2, which performs wireless communication with CS4-3.
This is referred to as S5-3.

Next, the operation of this embodiment will be described with reference to FIGS. 2, 3, and 4.

FIG. 2 is a diagram for explaining an example of the operation of the embodiment of FIG.

In FIG. 2, components corresponding to those shown in FIG. 1 are denoted by the same reference numerals or symbols, and description thereof is omitted.

FIG. 3 is a flowchart showing the operation of the SCP of the present invention.

First, as shown in FIG. 2, the status storage unit 3 of the SCP 2 stores PS5-1 and PS5- as subscriber terminals.
2. It is assumed that all PS5-3 are registered in the subscriber terminal number 31, and the respective call states 32 are all "idle". In addition, the busy destination 33 is
PS5-2 is set only, and the transfer destination is PS5.
-3.

At this point, a calling operation is performed by designating PS5-1 to PS5-2 as destinations.

When the PS 5-1 performs a calling operation,
Information such as the caller number as well as information such as the dialed number of the destination is transferred to the SCP 2 via the CS 4-1 and the switching network 1 (this state is shown as a control signal 7 in FIG. 2). The SCP 2 that has received the control signal 7 (S2 in FIG. 3)
1) Perform subscriber authentication such as whether the caller is a legitimate subscriber, and refer to the state storage unit 3 to change the call state 32 of the subscriber terminal PS5-2 designated as the destination to " Whether it is "busy" or "idle" is identified (S2 in FIG. 3). FIG.
Since the call state 32 of the PS 5-2 is "idle", the calling operation is performed so that the call is received at the destination specified by the caller (S3 in FIG. 3), and the destination PS 5-2 responds. As a result, PS5-1 and PS5-2 enter a communication state (this situation is shown as call flow 8 in FIG. 2). While the communication state continues, the SCP 2 treats the call state 32 of PS5-1 and PS5-2 as "busy" (S4 in FIG. 3), and determines whether or not the communication has been completed (FIG. 3).
S5), when the communication is completed, each call state 32 is returned to the "idle" state (S6 in FIG. 3), and the call is disconnected (S7 in FIG. 3).

Next, FIG. 3 and FIG. 4 show the operation of this embodiment when the call state 32 of the subscriber terminal PS5-2 designated as the destination is "busy" in S2 of FIG. It will be described with reference to FIG.

FIG. 4 is a second diagram illustrating an example of the operation of the embodiment of the present invention.

FIG. 4 is different from FIG. 2 only in that the call state 32 of the subscriber terminal PS5-2 designated as the destination is "busy".

Here, when a call operation is performed by designating PS5-1 to PS5-2 as destinations, information such as a dialer number of the destination and information such as a caller number are stored in C
It is transferred to the SCP 2 via the S4-1 and the switching network 1 (shown as the control signal 7 in FIG. 4 as in FIG. 2). The SCP 2 that has received the control signal 7 (S1 in FIG. 3) performs subscriber authentication such as whether the caller is a valid subscriber and refers to the state storage unit 3 to specify the destination. It is determined whether the call state 32 of the subscriber terminal PS5-2 is "busy" or "idle" (S2 in FIG. 3). PS in FIG.
Since the call state 32 of 5-2 is "busy", the SCP
Next, it is determined whether the busy transfer destination 33 of the PS 5-2 is described in the state storage unit 3 (S1 in FIG. 3).
0), if the busy transfer destination is not described (“No” in S10 of FIG. 3), the call is disconnected (S11 of FIG. 3),
The process ends.

If there is a description in the busy transfer destination 33 (FIG. 3
The SCP 2 refers to the call state 32 of the transfer destination (PS5-3 in FIG. 4) (S1 in FIG. 3).
2) If the call state 32 of the transfer destination is "busy", the call is disconnected (S13 in FIG. 3), and the process ends. If the call state 32 of the transfer destination is "idle", FIG.
("Idle" in S12), a call is connected to the transfer destination (S14 in FIG. 3), and the transfer destination PS5-3 answers and the PS5-1 and PS5-3 enter a communication state (this state). Is shown as a call flow 9 in FIG. 4). While the communication state continues, SCP2 is connected to PS5-1 and PS5-3.
Is handled as "busy" (S1 in FIG. 3).
5), it is determined whether or not the communication has been completed (S1 in FIG. 3).
6) At the end of the communication, each call state 32 is returned to the "idle" state (S17 in FIG. 3), the call is disconnected (S18 in FIG. 3), and the processing is terminated.

Next, SCP2 in the case where a call is made from the fixed telephone 6 in FIG.
The operation of will be described.

From the fixed telephone 6 to the PS5-
When the calling operation is performed by designating 2 as the destination, the SSP or the like that accommodates the fixed telephone 6 in the switching network 1 determines the destination and the destination is a portable terminal.
A control signal requesting an incoming call to the mobile terminal is transferred to the mobile terminal 2. The SCP2 that has received the control signal is shown in FIG.
The same operation as described above is performed. That is, S
As described in the flowchart of FIG. 3, CP2 determines the call state 32 of the destination PS5-2, and if "idle", connects the call to PS5-2 and connects the fixed telephone 6 and PS5-2. When the call state 32 of the destination PS5-2 is "busy", control is performed to connect the call to the transfer destination described in the transfer destination 33 when busy. If the call state 32 of the PS5-3 described in the transfer destination 33 during busy is also "busy", the call is disconnected and the call state 32 of the PS5-3 is set to "idle".
If so, an operation for enabling communication between the fixed telephone 6 and the PS 5-3 is performed. As described above, when a call operation is performed from the fixed telephone 6 by designating the PS5-2 as a portable terminal as a destination, the same operation as when the call operation is performed from the PS5-1 is performed by the SCP2. Do.

As described above, in the present invention,
SC as an external server deployed in a mobile phone system
In P, a state storage unit for managing the call connection state of the subscriber terminal is provided, and when the subscriber terminal is busy during a call, the call can be transferred to a pre-registered busy transfer destination. Can be realized.

Further, by registering a plurality of transfer destinations at the time of busy in one subscriber terminal, it becomes possible to realize a representative number receiving service using the one subscriber terminal as a representative number.

In order to realize the representative number receiving service, first, in the state storage section 3 shown in FIG.
The state storage unit 3 is extended so that can be set. Second
In the operation flowchart of the SCP2 shown in FIG. 3, it is determined whether or not there is a description of the next transfer destination which has not been searched yet among the plurality of N busy transfer destinations 33 between step S12 and step S13. Step S20 is additionally inserted. If the result of this determination is that there is a description of the next transfer destination, the flow returns to step S12 to search whether transfer is possible for the next transfer destination, and the next transfer destination is searched for. If there is no description, the SCP2 disconnects the call (proceed to step S13).
The operation of can be extended. This operation flowchart is shown in FIG. 5, but is different from the flowchart of FIG. 3 only in that the above-described step S20 is additionally inserted, so that further description will be omitted.

[0037]

According to the call control / management system in the portable telephone system of the present invention, since the external server of the portable telephone system has a function of managing the call connection state of the subscriber terminal, the busy transfer service and the representative number reception This has the effect of realizing the service.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of a call control / management method in a mobile phone system of the present invention.

FIG. 2 is a diagram illustrating an example of an operation of the exemplary embodiment in FIG. 1;

FIG. 3 is a flowchart showing the operation of the SCP of the present invention.

FIG. 4 is a second diagram illustrating an example of the operation of the embodiment of the present invention.
FIG.

FIG. 5 is a second flowchart showing the operation of the SCP of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Switching network 2 SCP 3 State storage part 31 Subscriber terminal number 32 Talk state 33 Busy transfer destination 4-1 4-2, 4-3 CS 5-1 5-2, 5-3 PS 6 Fixed telephone

 ──────────────────────────────────────────────────続 き Continuing on the front page F term (reference)

Claims (7)

[Claims] 1. An S for controlling a network service.
CP (Service Control Point):
Service control station),
Multiple PS (Personal St) as mobile terminal
the SCP is provided with a call connection state storage device for indicating whether the terminal is in a busy state during a call or in an idle state without a call, and any one of the plurality of PSs Is called, the call connection state of the destination PS is determined with reference to the call connection state storage device, and the destination of the call is determined according to the result of the determination. A call control / management method in a cellular phone system, further comprising a connection destination determining means for determining whether or not to change the connection and connecting the call to the SCP. 2. The method according to claim 1, wherein the call connection state storage device includes a plurality of PSs.
And a call connection state indicating whether the PS described in the subscriber terminal number section is currently in a busy state during a call or in an idle state without a call. And a busy transfer destination indicating a transfer destination terminal number for transferring an incoming call to the PS to another PS when the PS described in the subscriber terminal number is busy. 2. The call control / management method according to claim 1, wherein the call control / management method comprises a mobile phone system. 3. The method according to claim 2, wherein the connection destination determining means includes a certain PS.
When a call that designates a destination is made, the destination P
The terminal number of S is searched for by searching the subscriber terminal number section of the call connection state storage device, and the call connection state of the destination PS is referred to by referring to the call state section of the call connection state storage device. If the result of the determination is idle, the call is connected to the destination PS. If the result of the determination is busy, the transfer destination of the call is transferred to the destination of the call connection state storage device. A destination determination is performed to determine whether or not the destination is described in the busy-time destination. If the destination is described as a result of the destination determination, the call is transmitted to the PS described in the busy-time destination. 3. The portable telephone system according to claim 1, wherein the call is disconnected when the transfer destination is not described as a result of the transfer destination determination. Control / management method. 4. The method according to claim 1, wherein the connection destination determining means includes a certain PS.
(S1) receiving control information including calling information when a call is made to designate the destination P
Searching for the terminal number of S by searching the subscriber terminal number section of the call connection state storage device, and determining the call connection state of the destination PS by referring to the call state section (S2). If the result of the determination in step S2 is idle, the step of connecting the call to the destination PS (S3), and the call connection status of the calling terminal station and the call status part of the destination PS are busy. (S4),
A step of determining the end of the call (S5);
If the call is not completed in the determination of step 5, the step S5 is repeatedly executed, and when the call is completed in the determination of step S5, the call connection state of the calling state unit of the calling terminal station and the destination PS. Is executed (S6) to disconnect the call (S7). If the result of the determination in step S2 is busy, the transfer destination PS of the destination PS is described in the busy transfer destination section. Step (S10) for determining whether there is a call, and if the result of the determination in step S10 is not described, the call is disconnected (S11). If the result of the determination in step S10 is described, then the call is terminated. A step (S12) of determining the call connection state of the transfer destination PS by referring to the call state section, and a step of connecting the call to the transfer destination PS if the result of the determination in step S12 is idle (S14). )When, The step of the call connection state of the call state of the call source terminal station and said destination PS busy (S1
5) and a step of determining the end of the call (S16);
If it is determined in step S16 that the call is not terminated, step S16 is repeatedly executed. When the call is terminated in step S16, the call connection between the calling terminal station and the call state part of the transfer destination PS is performed. A step of setting the state to idle (S17) is performed to disconnect the call (S18), and if the result of the determination in step S12 is busy, a step of disconnecting the call (S13) is performed. A call control / management method in the mobile phone system according to claim 1 or 2. 5. The method according to claim 1, wherein the call connection state storage device includes a plurality of PSs.
And a call connection state indicating whether the PS described in the subscriber terminal number section is currently in a busy state during a call or in an idle state without a call. And a call state section for transferring the incoming call to the PS to any one of the plurality of N PSs when the PS described in the subscriber terminal number section is busy. 2. The call control / management method according to claim 1, further comprising a plurality of N busy destinations indicating a destination terminal number. 6. The method according to claim 1, wherein the connection destination determining means includes a PS
When a call that designates a destination is made, the destination P
The terminal number of S is searched for by searching the subscriber terminal number section of the call connection state storage device, and the call connection state of the destination PS is referred to by referring to the call state section of the call connection state storage device. If the result of the determination is idle, the call is connected to the destination PS. If the result of the determination is busy, the transfer destination of the call is transferred to the destination of the call connection state storage device. A transfer destination determination is performed to determine whether or not the destination is described in the plurality of N busy destinations, and as a result of the transfer destination determination, the destination is transferred to any of the plurality of N busy destinations. When described, any one of the plurality of N busy-time transfer destination units is described and the call connection state of the transfer destination PS is transferred and connected to a PS whose state is idle; When the destination is not described as a result of the destination determination, or 6. The mobile phone system according to claim 1, wherein when all of the plurality of N PSs in the busy transfer destination are in a busy state, the call is disconnected. Call control / management scheme. 7. The method according to claim 1, wherein the connection destination determining means is a PS
(S1) receiving control information including calling information when a call is made to designate the destination P
Searching for the terminal number of S by searching the subscriber terminal number section of the call connection state storage device, and determining the call connection state of the destination PS by referring to the call state section (S2). If the result of the determination in step S2 is idle, the step of connecting the call to the destination PS (S3), and the call connection status of the calling terminal station and the call status part of the destination PS are busy. (S4),
A step of determining the end of the call (S5);
If the call is not completed in the determination of step 5, the step S5 is repeatedly executed, and when the call is completed in the determination of step S5, the call connection state of the calling state unit of the calling terminal station and the destination PS. Is executed (S6) to disconnect the call (S7), and if the result of the determination in step S2 is busy, the call is transferred to the plurality of N destination transfer destinations of the destination PS. A step (S10) of determining whether or not there is a description of the preceding PS, and if the result of the determination in step S10 is not described, the call is disconnected (S11), and if the result of the determination in step S10 is described. Next, a step (S12) of determining the call connection state of the transfer destination PS by referring to the call status section, and if the result of the determination in step S12 is idle, the call is connected to the transfer destination PS. Step (S And 4) the calling terminal station and the destination P
A step (S15) of making the call connection state of the call state part of S busy, and a step of determining the end of the call (S1)
6) and if the call is not terminated in step S16, step S16 is repeatedly executed, and step S16
When the call is terminated in the determination of (1), the step (S17) of setting the call connection state of the calling state section of the calling terminal station and the transfer destination PS to idle is executed to disconnect the call (S18).
If the result of the determination in step S12 is busy,
A step (S20) of determining whether or not the next transfer destination PS is described in the plurality of N busy destinations of the destination PS, and if the result of the determination in step S20 is not described If the result of the determination in step S20 is that the call is disconnected (S13), the next transfer destination PS is set as the transfer destination PS, and the process returns to step S12 to search for a transferable PS. The call control / call control in the mobile phone system according to claim 1 or 5, wherein
Management method.