JPH08331642A - Mobile station-addressed incoming call transfer system, base station and service control station - Google Patents

Abstract

PURPOSE: To offer the incoming call transfer service to a mobile station by means of only the resources of the mobile network side. CONSTITUTION: One or both of base stations 30-A2 an 30-B2 are provided with the incoming call transfer service information storage parts 34-A2 and 34-B2 which update and store the information on the mobile station which performs an incoming call transfer operation and also on the transfer destination terminal in response to the external information, and the incoming call transfer parts 33-A2 and 33-B2 which transfer the incoming states to the corresponding transfer destination terminal 22-2 when the information on a calling mobile station 31 are stored in the parts 34-A2 and 34-B2. Furthermore, a service control station 32 includes an incoming transfer control part 36 which updates and controls the store contents of a position register part 21 as well as the parts 34-A2 and 34-B2. So that a call given to the mobile station under the service registration reaches a prescribed base station and this station can send the call to its transfer destination terminal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an incoming call transfer system for a mobile station, a base station and a service control station, and is preferably applied to, for example, a simple portable telephone system (PHS; personal handyphone system).

[0002]

2. Description of the Related Art An incoming call transfer service in a mobile communication system is a service for transferring an incoming call to a mobile station (PS) that has a contract for this service in advance to another telephone terminal.

In a mobile communication system in which a mobile communication network having a switching function (mobile exchange) is provided in addition to a fixed network, such a call transfer service is provided from a calling terminal 1 as shown in FIG. This is realized by transferring the call to the designated transfer destination terminal 5 by using the incoming call transfer mechanism 4a of the mobile switching center 4 located outside the fixed network 3 for controlling the incoming call to the contracted mobile station 2. ing.

Here, there are the following three modes (1) to (3) as modes for realizing the call transfer service.

(1) The contracted mobile station 2 registers the start of service and the transfer destination terminal 5 in advance in the mobile communication network via the base station (CS) 6, and the contracted mobile station 2 receives a call. In this case, the mobile switching center 4 that recognizes this transfers the call to the designated transfer destination terminal 5.

(2) When the contracted mobile station 2 receives an incoming call, the contracted mobile station 2 moves through the base station 6 according to an instruction from the receiving user (or the mobile station autonomous operation by setting the mode to the contracted mobile station 2). A transfer request is made to the body exchange 4, and the mobile exchange 4 that has received the request transfers the call to the designated transfer destination terminal 5.

(3) Whether the contracted mobile station 2 is turned off,
When the service is out of the service area and does not respond within a certain time, the calling mobile switching center 4 transfers the call to the transfer destination terminal 5 designated in advance.

[0008]

Even in PHS, which is about to start its operation, it is desired to provide the call transfer service to the contracted mobile station, like other mobile communication systems.

However, in the PHS, as shown in FIG. 3, a wired communication network operator operating a fixed network (wired communication network) 3 including a base station control function (for example, a location registration function 3a), a base station 6, It has been instructed by the Ministry of Posts and Telecommunications to provide mobile communication services by clearly separating the mobile station (PS) 2 and the PHS operator operating the service control station 7 that performs the authentication function, etc. The PHS business operator cannot freely use the resources for providing the additional service in the exchange owned by the wired communication network business operator.
Therefore, when the PHS operator intends to provide an incoming call forwarding service to its own customer, if the incoming call forwarding mechanism in the exchange in the fixed network 3 owned by the wired telecommunications carrier can be used, the incoming call forwarding is performed. Although it is possible to realize the service, a contract procedure is required between the business operators, and it is impossible for the PHS business operator to independently operate the call transfer service for the customer.

Therefore, as in the existing mobile communication system, there is a demand for a new call transfer method addressed to a mobile station, which can be realized by using fixed network resources in a general communication mode and can be applied to PHS. .

[0011]

In order to solve such a problem, the first aspect of the present invention is such that a plurality of base stations capable of accommodating mobile stations and a service control station having an authentication function unit are provided with a position registration unit. (A) In a mobile communication system connected to a wired network that the user has, (A) a call transfer service information storage unit that updates and stores information of a mobile station that executes a call transfer operation and a transfer destination terminal according to external information. And an incoming call transfer unit for transferring the incoming call to the corresponding transfer destination terminal when the mobile station relating to the call is stored in the incoming call transfer service information storage unit, in all or some of the base stations. With
(B) A call transfer service information storage unit and a location registration unit are provided so that a call to a mobile station relating to service registration reaches a predetermined base station and the base station can execute an incoming call to a transfer destination terminal. The service control station is provided with an incoming call transfer control unit for updating and controlling the stored contents.

The base station of the second aspect of the present invention is (A-1) Call forwarding service information storage for updating and storing the information of the mobile station executing the call forwarding operation and the forwarding destination terminal according to the information from the outside. Section and (A-2) the mobile station relating to the call has an incoming call forwarding section for forwarding the incoming call to the corresponding forwarding destination terminal when stored in the incoming call forwarding service information storage section. And

The base station of the third aspect of the present invention is: (a-1) Call transfer for updating and storing information of a mobile station and a transfer destination terminal which execute a call transfer operation when there is no response, in accordance with information from the outside. When the service information storage unit and (a-2) the mobile station related to the call are stored in the call transfer service information storage unit and there is no response for a predetermined time, the call is transferred to the corresponding transfer destination terminal. And a call forwarding unit.

In the service control station of the fourth aspect of the present invention, a call to the mobile station during the call transfer service registration reaches a predetermined base station, and the base station can execute the call reception to the transfer destination terminal. , A call forwarding service information storage unit provided in the base station and a call forwarding control unit for controlling update of stored contents of a location registration unit under the wired network.

[0015]

In the first to fourth aspects of the present invention, the call transfer control unit of the service control station is responsive to a registration request, a deregistration request, or the like, and only a call to the mobile station during service registration is given to the predetermined base station. And the stored contents of the incoming call transfer service information storage unit and the location registration unit are updated and controlled so that the base station can execute the incoming call to the transfer destination terminal.

In such a situation where the contents stored in the call transfer service information storage section and the location registration section are such that the call transfer section of the base station stores the mobile station related to the call in the call transfer service information storage section. When it recognizes that there is a call (including the case where it is stored for automatic forwarding when there is no response), it forwards the incoming call to the corresponding forwarding destination terminal.

As a result, it becomes possible to transfer the incoming call to the mobile station to the transfer destination terminal only by adding the function unit to the base station and the service control station, in other words, without adding the function on the wired network side.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to PHS will be described in detail below with reference to the drawings. Here, FIG. 1 shows the overall configuration of the PHS of this embodiment that can provide a call transfer service.

(A) Configuration of Embodiment In FIG. 1, in this embodiment, a fixed network (digital network) 20 operated by a cable communication network operator and a position registration unit 2 are used.
1 is not provided with a dedicated configuration for call transfer, and is responsible only for general communication functions. Further, the fixed terminals 22-1 and 22-2 accommodated in the fixed network 20 do not need any dedicated function for transferring an incoming call.

On the other hand, with respect to the resources operated by the PHS carrier, a mechanism for transferring a call is provided. That is, a plurality of base stations (CS) 30-A1 to 30-A3, 30- belonging to the same calling area AR-A, AR-B.
At least one (may be all or one in a plurality of calling areas) of the base stations 30-A2 and 30-B2 among the B1 to 30-B3, the call transfer unit 3
3-A2, 33-B2 and call transfer service information storage unit 3
4-A2 and 34-B2 are provided. The service control station (SCP) 32 is also provided with an incoming call transfer control unit 36 in addition to the authentication function unit 35. Further, the mobile station (PHS terminal: PS) 31 is also provided with a call transfer service setting instruction unit 37 for instructing registration and cancellation of the call transfer service.

The call transfer service setting instructing section 37 of the mobile station 31 is instructed to register or cancel registration when the user inputs an instruction to register or cancel the call transfer service. Is transmitted to the base station. Here, when the special number input is assigned to registration and deregistration, the general key input configuration is the call transfer service setting instruction unit 37.

The call transfer service information storage units 34-A2 and 34-B2 in the base stations 30-A2 and 30-B2 are
Under the control of the service control station 32, the information of the mobile station 31 set in the execution mode of the call transfer service is stored together with the number of the transfer destination terminal.

The call transfer units 33-A2, 33-B2 in the base stations 30-A2, 30-B2 are the service control stations 3
Under the control of 2, the corresponding call transfer service information storage unit 3
The storage processing and the deletion processing for 4-A2 and 34-B2 are executed. In addition, the call transfer unit 33-A2, 33
-B2 is the corresponding call transfer service information storage unit 34-
When a mobile station whose mobile station number is stored in A2, 34-B2 is detected, or in a corresponding call transfer service information storage unit 34-A2, 34-B2, the mobile station number is the transfer target when no response is received. When the stored mobile station does not respond for a predetermined time, a calling sequence (incoming call transfer) to the transfer destination terminal number stored in association with the mobile station (terminal number) is executed. .

For example, the base station is, in terms of hardware,
A wireless interface unit, a wired interface unit (I ′ interface unit), a switch unit for exchanging wireless channels and wired channels, a central processing unit (CPU) for controlling a call sequence, a memory used by the central processing unit, and the like. The memory corresponds to the call transfer service information storage section 34-A2, 34-B2, and the switch section and the central processing unit correspond to the call transfer section 33-A2, 33-B2.

The call transfer control section 36 of the service control station 32
When a mobile station receives a call transfer service registration request, the mobile station determines a base station (and hence a calling area) to execute the call transfer operation for the mobile station.
The pseudo corresponding information of the calling area (base station) is registered in the position registration unit 21, and the above-mentioned information necessary for call transfer is stored in the call transfer service information storage unit of the determined base station. Further, when an incoming call transfer service release request is issued from a mobile station, the incoming call transfer control unit 36 recognizes a pseudo base station accommodating the mobile station at that time and receives an incoming call from the base station. Information is deleted from the transfer service information storage unit for transfer, and information on the base station actually accommodating the mobile station at that time is registered in the position registration unit 21. Further, the incoming call transfer control unit 36 of the service control station 32 also performs position registration for automatic transfer operation when there is no response, which will be described later, and timer control.

In terms of hardware, the service control station is
It is composed of an interface unit (I 'interface unit) with a fixed network, a central processing unit for executing various processes as a service control station, a memory which the central processing unit appropriately uses, and the like. It corresponds to the transfer control unit 36.

(B) Operation of Embodiment (B-1) Call Transfer Service Registration Operation by Contract Mobile Station First, the call transfer service registration operation by the contract mobile station in the embodiment system is shown in the system block diagram of FIG. In addition, the details will be described with reference to the sequence diagram of FIG.

(1-1) The base station 30-A1 which is in the calling area AR-A to which it belongs and which has received an incoming call transfer request including transfer destination terminal information from a mobile station 31 is the fixed network 2
A call transfer service registration request (start request) is issued to the service control station 32 via 0. At this time, the mobile station 3
The call forwarding service registration request from step 1 may be a method such as inputting a specific dial number or a specific arrangement between the mobile station and the base station, which method is outside the features of this embodiment. In short, the request from the mobile station 31 is transmitted to the base station 30.
Any instruction method can be used as long as it is a method by which the A1 can reach the service control station 32.

(1-2) When the incoming call transfer service start request is given, the incoming call transfer control unit 36 of the service control station 32 transfers the incoming call to the mobile station 31 using the built-in decision reference information 36a. A base station (30-B2) to operate is determined. That is, in this embodiment, not the base station 30-A1 accommodating the mobile station 31 but the determined other base station 30-B1 executes the call transfer.

For example, as the decision reference information 36a, charge area information (36) in which the station number of the fixed network and the base station are associated with each other.
(a) is prepared, the base station expected to have the lowest call charge to the designated transfer destination terminal is analyzed, and the base station performing the call transfer operation for the base station having the lowest charge is determined. In this analysis, in addition to the call charge, the logic of selecting a low-traffic base station with reference to the traffic information (36a) for each base station managed by itself may be added.

FIG. 5 is a flow chart showing a processing example of such a determination method. First, of the base stations that have not yet been searched for determination, the base station with the lowest communication charge with the transfer destination terminal is extracted (step 100), and then the traffic volume of that base station is extracted (step 100). 101),
The traffic amount is compared with a threshold value (step 102),
If it is smaller than the threshold, the base station is decided (step 10).
3) If it is larger than the threshold value, the process returns to step 100 to confirm the next cheapest base station.

Although different from FIG. 4, the service control station 32 performs the processing (1-2) again due to the fluctuation of traffic, and the base station executing the call transfer service is dynamically changed according to the traffic volume. You may make it fluctuate. FIG. 6 is a flowchart showing a processing example in this case. First, when recognizing a base station in which the number of accommodated mobile stations has changed, the processing shown in FIG. 6 is started, and the pair information of the mobile station and the destination terminal, which make the base station the execution base station of the call transfer operation, One is taken out from the memory or its base station (step 200), and then the processing shown in FIG. 5 is performed based on the taken out transfer destination terminal information and the like (step 20).
1) After that, it is determined whether or not the pair information of the mobile station and the destination terminal whose base station is the execution base station of the call transfer operation remains (step 202). For example, the process returns to step 200 above.

(1-3) The service control station 32 requests the determined base station 30-B2 to register (start) the call transfer service, and the mobile station 31 is present under this base station. In this way, the instruction to pseudo-register the location is given. At this time, the service control station 32 activates the call transfer service to the mobile station 31, and confirms that the base station 30-
It is stored that pseudo location registration is performed for B2 (note that transfer destination terminal information may also be stored).

(1-4) The base station 30-B2 receiving the instruction
According to a general location registration procedure (for example, standardization recommendation JT-Q931-b "Call processing sequence location registration" of the Telegraph and Telephone Technical Committee Corporation), the fixed network (the digital network) 20
To the calling area A of the mobile station 31
Location registration is performed as RB. As a result, the fixed net 2
At 0, the location information of the mobile station 31 is used as the calling area AR-B.
Therefore, subsequent calls to the mobile station 31 are made to the base station groups 30-B1 to 30-B3 in the calling area AR-B.

FIG. 7 is a sequence diagram showing a general location registration procedure. In the process (1-4), the latter half process shown in FIG. 7 is executed.

(1-5) The base station 30-B2, which has performed the pseudo location registration with the fixed network 20, stores the service requesting terminal number (mobile station number) in its own call transfer service information storage unit 34-B2. And the transfer destination terminal number.

In the above description, the base stations 30-A2 and 30-B2 capable of actually executing the call transfer are shown to be able to register the service. However, such a registration operation based on a request from the contracted mobile station and deregistration described later. As a matter of course, the operation may be performed by the base station that cannot execute the call transfer.

(B-2) Call Transfer Service Registration Operation by Other Terminal Next, call transfer is performed using a terminal (fixed terminal or mobile station) other than the mobile station with which the user has a contract for the call transfer service. The operation for registering the start of the service will be described. The sequence diagram at this time is omitted.

Here, it is assumed that a base station (referred to as base station 30-A2) dedicated to the registration operation from another terminal is determined. The identification number DMI of the pseudo mobile station which does not actually exist as the instruction information of the call transfer service from the other terminal.
It is assumed that D-1 is assigned. The location registration unit 21 fixedly performs location registration such that the pseudo mobile station (identification number DMID-1) is located in the calling area AR-A including the base station 30-A2.

In such a state, for example, the fixed terminal 22-
When 1 makes a call to the pseudo mobile station (identification number DMID-1), the call setting signal reaches the base station 30-A2 from the fixed network 20 according to the contents of the location registration unit 21.
At this time, the base station 30-A2 (the call transfer unit 33-A thereof)
2) is its own call transfer service information storage unit 34-A2
After recognizing that it is a service registration start request from another terminal based on the stored contents of, and establishing a call with the calling terminal (same as the processing of (2-1) and (2-2) described later ), And the terminal numbers of the mobile station and the transfer-destination terminal related to registration are fetched.

The subsequent operation is the same as when a registration request is made from a mobile station that has a contract for a call transfer service (the latter half of the processing in (1-1) above and (1-2) above). ) ~ (1-
Refer to the processing of 5)).

(B-3) Location registration refusal operation during call forwarding service Although illustration of the sequence diagram is omitted, it is a new case such as when the mobile station 31 requesting the call forwarding service is turned on again after powering off. When the location registration request is issued, the authentication process is executed between the base station (30-A1) accommodating the mobile station 31 and the service control station 32. The service control station 32 uses the above (1-3). Based on the information stored in
Recognizing that the call transfer service is set for the mobile station 31, the authentication at the time of location registration is not established, and the fixed network 2
New location registration to 0 is prohibited.

As described above, the service control station 32 that has received the call transfer request rejects the new position registration until it receives the call transfer cancellation request from the mobile station 31, and prevents the call transfer service from being unintended by the user. .

It is another embodiment of the present invention that the service control station 32 processes the new location registration request during the call transfer service as a call transfer cancellation request.

(B-4) Call Forwarding Operation Based on Setting Registration Next, the operation when there is an incoming call to the mobile station 31 for which the incoming call forwarding service is registered and the call is forwarded to the forwarding destination terminal 22-2 will be described.

Here, FIG. 8 is a sequence diagram showing the call transfer operation, and FIG. 9 is a block diagram showing an image of the call transfer. In FIG. 8, the calling terminal 2
An incoming call sequence for an outgoing call from 2-1 is, for example,
Telegraph and Telephone Technical Committee Standardization Recommendation JT-Q931
-B "Call processing sequence: Incoming call", and the calling sequence from the base station 30-B2 to the transfer destination terminal 22-2 is, for example, the Japan Telegraph and Telephone Technical Committee Standardization Recommendation JT-Q931-b. It is based on “Call processing sequence Call”. In FIG. 8, the code (1) added to the rear of the term indicating the sequence indicates signal exchange with the calling terminal 22-1, and the code (2) is the transfer destination terminal 22-2.
It shows the exchange of signals with and.

Further, the transfer destination terminal 22-2 is added to the mobile station 31.
It is assumed that the operation for performing the call transfer service for the call is performed, the service control station 32 determines the base station 30-B2 to perform the call transfer, and the call transfer service is started ( Above (B-1) or (B-2)
reference).

(2-1) When a call from a certain terminal 22-1 to the mobile station 31 occurs, in the fixed network (digital network) 20, based on the registration content (pseudo registration content) of the location registration unit 21. , The area in which the mobile station 31 is located is determined to be the calling area AR-B, and all the base stations 30- in the calling area AR-B are determined.
Call setup is performed for B1 to 30-B3.

As described above, since the location registration for the mobile station 31 based on the request for starting the call transfer service is performed regardless of the area in which the mobile station 31 is located, at this time, the mobile station 31 is located in the calling area AR-B. Most do not.

(2-2) In the base station 30-B2, it is confirmed that the mobile station 31 relating to the incoming call is registered as the mobile station that executes the incoming call forwarding service in its own incoming call forwarding service information storage section 34-B2. It recognizes and activates the call transfer function by the call transfer unit 33-B2, and does not execute the incoming call sequence with the mobile station 31 and calls the calling terminal 22 via the fixed network 20.
The incoming call sequence for -1 is executed.

Since the other base stations 30-B1 and 30-B3 in the calling area AR-B do not receive an incoming call response even when calling the mobile station, no further processing is executed.

(2-3) Base station 30-B2 (incoming call transfer unit 33
-B2) next reads the call transfer destination to the mobile station 31 from the call transfer service information storage unit 34-B2 of its own, and performs the call setting process for the terminal 22-2 associated with the acquired transfer destination terminal number. To execute. As the calling terminal number at this time,
The number of the mobile station 31 is used, and the fixed network 20 uses the mobile station 3
1 is recognized as a call from the terminal 22-2.

In the normal calling operation from the mobile station, an authentication sequence exists in the sequence, but since the authentication related to the registration of the call transfer is performed (the above description is omitted), This can be omitted in the calling sequence at the time of call transfer, and FIG. 8 shows this case.

(2-4) The base station 30-B2 is the transfer destination terminal 2
2-2 responds to the calling terminal 22-1 in response to the response.

(2-5) The call transfer unit 33-B2 in the base station 30-B2 causes the calling terminal 22-1 to move to the base station 30-B.
Incoming call to B2, base station 30-B2 to transfer destination terminal 22-
2 calls of 2 are simultaneously established, and the calling terminal 22-1
From the transfer destination terminal 22-2. At this time, the fixed network 20 only recognizes that two independent calls are generated.

The interface (for example, I'interface) applied between the base station 30-B2 and the fixed network 20 allows simultaneous communication of a plurality of channels (for example, 2 × n (n is a natural number) B channels). It is easy to handle such two independent calls.

As described above, as shown in the image of FIG. 9, the incoming call from the calling terminal 22-1 to the mobile station 31 is transferred to the transfer destination by the function of the incoming call transfer unit 33-B2 of the base station 30-B2. It can be transferred to the terminal 22-2.

In the above, the transfer destination terminal is the fixed network 20.
However, the transfer destination terminal may be a mobile station, and in this case, the call sequence to the transfer destination terminal is for the mobile station.

(B-5) Operation for Canceling Call Forwarding Service Registration by Contracted Mobile Station Next, an operation for canceling the registered state of the call forwarding service will be described. Here, FIG. 10 shows a sequence during such an operation.

(3-1) The base station 30-A1 which has received the registration cancellation request (stop request) of the call transfer service from a certain mobile station 31 in the calling area AR-A to which it belongs
Makes a request for canceling the registration of the call transfer service to the service control station 32 via the fixed network 20. At this time, the registration cancellation request from the mobile station 31 may be a method such as inputting a specific dial number or a specific arrangement between the mobile station and the base station.

(3-2) In the service control station 32, the mobile station 3
The base station (base station 30-B2) that has been pseudo-registered in order to realize the call forwarding function of No. 1 is searched, and the stored information relating to the call forwarding inside itself is deleted, and the fixed network 2
A pseudo location registration cancellation request is issued to the base station 30-B2 via 0.

(3-3) Incoming call transfer unit 33 of base station 30-B2
-B2 is its own call transfer service information storage unit 34-B
The information of the mobile station 31 (registration mobile station and transfer destination terminal information of the call transfer) is deleted from 2. At this time, it is not necessary to perform a special operation on the fixed network 20.

(3-4) The mobile station 31 issues a location registration request automatically when a predetermined time has elapsed after issuing the registration cancellation request or in response to a user operation. Although the authentication sequence is omitted in FIG. 10, the current location registration by the mobile station 31 is accepted by canceling the call transfer to the service control station 32. Further, the calling area AR-A at this time is newly registered in the position registration unit 21, and the normal service state is restored.

(B-6) Operation for canceling registration of call transfer service by another terminal Next, a call is received using a terminal (fixed terminal or mobile station) other than the mobile station with which the user has a contract for the call transfer service. The operation when deregistering the transfer service will be described. The sequence diagram at this time is omitted.

Here, it is assumed that a base station (referred to as base station 30-A2) dedicated to the operation of deleting registration from another terminal has been determined. Further, it is assumed that the pseudo mobile station identification number DMID-2 that does not actually exist is assigned as the call forwarding service cancellation instruction information from the other terminal. And
The location registration unit 21 fixedly registers the location such that the pseudo mobile station (identification number DMID-2) is located in the calling area AR-A including the base station 30-A2.

In such a state, for example, the fixed terminal 22-
When 1 makes a call to the pseudo mobile station (identification number DMID-2), the call setting signal arrives from the fixed network 20 to the base station 30-A2 according to the contents of the location registration unit 21. At this time, the base station 30-A2 (the incoming call transfer unit 33 thereof)
-A2) is its own call transfer service information storage unit 34-
After recognizing that it is a service registration cancellation request from another terminal based on the stored content of A2 and establishing a call with the calling terminal 22-1 ((2-1) and (2-2) above) (Similar to the processing of 1)), the terminal number of the mobile station related to the registration cancellation is fetched.

The operation thereafter is the same as when a registration cancellation request is issued from a mobile station that has a contract for a call transfer service (the latter half of the above (3-1) process and the above (3- 2) ~
(Refer to the processing of (3-4)).

(B-7) Call Forwarding Operation by No Response of Mobile Station As is well known, the mobile station performs position registration when the mobile station is powered on. Further, when it is recognized that the calling area (or the accommodating base station) has changed due to the movement of the mobile station, the location is automatically registered. Therefore, the calling area recognized by the fixed network is the calling area when the mobile station last performed the location registration operation. For this reason, there is a case where the fixed network calls the mobile station but does not respond from any of the base stations in the calling area. In this case, it is either out of service area or the power of the mobile station is cut off. It is in the state of being.

In the fixed network, since it is possible to recognize that there is no response from the calling base station, the wired communication network operator can provide the call transfer service relatively easily at this occasion. However, as mentioned at the beginning, the PHS business operators cannot provide this service independently because the business operators are different.

In the following, a call transfer operation that can be executed when the mobile station does not respond even though the fixed network side executes a normal call sequence will be described.

The operation for executing the call transfer when there is no response is divided into two kinds of operations, that is, a registration operation for the representative base station and a transfer operation when an actual call is received, which will be described below in order. Note that FIG. 11 is a sequence diagram relating to the former operation, and FIG. 12 is a sequence diagram relating to the latter operation.

The base station (hereinafter referred to as the representative base station) that executes the call transfer when there is no response is called by each calling area AR-.
One is set for each of A and AR-B. In the case of FIG. 1, it is assumed that the base stations 30-A2 and 30-B2 are designated as the representative base stations. Further, the call transfer when there is no response is allowed only to the mobile station that has a service contract (a service contract higher than a general call transfer service) for that purpose. This contract content also includes information on the transfer destination terminal, which is stored and managed by the service control station 32. It should be noted that the transfer destination terminal at the time of no response is not always the call transfer that the user was aware of, and therefore it is considered that the transfer destination terminal is often a terminal equipped with an answering machine function.

(4-1) When general location registration is made from the mobile station 31 that has signed the call transfer service contract when no response is received, the accommodation base station (30-A1) moves the location. Service control station 32 to authenticate station 31
Communication with.

(4-2) At this time, the service control station 32
If the mobile station 31 is a mobile station that has previously contracted the call transfer when the mobile station does not respond, the non-answer call transfer contract is concluded with the representative base station 30-A2 in the calling area AR-A. It notifies that the mobile station 31 that is present has been registered in the calling area AR-A. The notification also includes the transfer destination terminal number of the mobile station 31 managed by the service control station 20.

(4-3) Representative base station 30-
A2 stores the corresponding mobile station 31 in the call transfer service information storage unit 34-A2 as a call transfer target mobile station when there is no response. At this time, the number of the call transfer destination, which is included in the notification from the service control station 20 and which is registered in advance by the mobile station 31 at the time of contract, is also stored.

Next, the operation when a call (incoming call) is made to the mobile station 31 for which the call transfer registration at no answer is made will be described in detail with reference to FIG.

(5-1) When a call is made to the mobile station 31 in the calling area AR-A, the base station 30-A2, which is the representative base station, requests the service control station 32 to perform the same request as the authentication request. Take a sequence. At this time, if the mobile station 31 responds within this area AR-A, the authentication request of the base station 30-A2 is discarded and the call is established in the normal sequence.

(5-2) When the service control station 32 receives the authentication request from the representative base station 30-A2, the service control station 32 sets the internal timer Tx, and when the time measured by the timer Tx is up, the service control station 32 Returns an authentication response to the representative base station 30-A2. This authentication response is the representative base station 30-A.
From the viewpoint of 2, it means the activation of the call transfer operation.

The set time of the internal timer Tx is
The fixed network 20 is selected to be shorter than the set time for determining that there is no response.

(5-3) On this occasion, the representative base station 30-A2 executes the same processes as in (2-2) to (2-5) described above, and the base station from the calling terminal 22-1. Incoming call to station 30-A2,
2 of calls from the base station 30-A2 to the transfer destination terminal 22-2
A call is established at the same time, and a call from the calling terminal 22-1 to the transfer destination terminal 22-2 becomes possible.

The access of the authentication function unit 35 at the time of the location registration request from the other calling area AR-B of the mobile station 31 (in this case, the registration operation for the new representative base station 30-B2 is executed). However, the service control station 32 finds out that the registration of the mobile station 31 to the representative base station 30-A2 has been canceled, and the access to the service control station 32 such as authentication from the target base station 30-A2 is made. By adding deregistration information to the response when it occurs,
Deregistration can be realized.

(C) Effects of the Embodiment (1) According to the above embodiment, the call transfer service can be provided by adding the functional units to the base station and the service control station, and the fixed network side can be changed or the fixed network can be provided. Since a dedicated line for the call transfer service is not required, it is possible to minimize the improvement part necessary for providing the service. Also,
Since only the functions of the base station and service control station are added,
The PHS business operator can independently develop the service, and the cost for the user to enjoy the service is limited to the PHS business operator, so that the service function of the system can be enhanced.

(2) Since the position of the mobile station is irrelevant at the time of call transfer, the base station that realizes the call transfer service can be changed, and it can be static or dynamic depending on the traffic situation of normal calls and the call charge to the transfer destination terminal. Since it is possible to assign a base station for executing call transfer to the base station, it is possible to effectively operate a base station with low traffic and further improve the quality of service to the user.

(3) Further, since it is possible to carry out call forwarding when there is no response, and service start registration and deregistration from another terminal, a very effective call forwarding service can be realized.

(D) Other Embodiments In the above description of the embodiments, various other modified embodiments have been mentioned, but the following other embodiments can be mentioned.

(1) In the above embodiment, the location registration is performed by associating the mobile station with the calling area.
The present invention can be applied to a system for registering a location by associating a mobile station with a base station. In this case,
For example, the base station that has received the location registration request from the mobile station may be set as the representative base station for call transfer when there is no response.

(2) In the above embodiment, the base station that executes the operation of transferring to the transfer destination terminal at the time of incoming call also has the normal communication function. However, the base station that executes such operation performs the operation. It may be a pseudo base station that exclusively handles only the above. Even in this case, it is preferable to provide at least one call area for each call area in consideration of call forwarding when there is no response. Also in this case, the pseudo base station to be used may be determined in consideration of the traffic volume and the call charge.

(3) Although only one transfer destination terminal can be registered as the transfer destination terminal in the above embodiment, a plurality of transfer destination terminals may be registered by setting a priority order. In the case of medium or the like, the data may be transferred to a transfer destination terminal having a low priority.

(4) In the above embodiment, when the representative base station receives the incoming call response from the mobile station, the normal communication operation is performed. In other words, the mobile station responds to the incoming call request. Although it is shown that the call transfer cannot be instructed, the mobile station may be provided with a function of transmitting a special number signal and the like, and the representative base station that receives the special number signal and the like may execute the call transfer operation.

(5) The distribution of functions between the service control station and the base station in the above embodiment is not limited to this. If possible, the function of one station may be made the function of the other station.
For example, in the above-described embodiment, the location registration for the location registration unit is all performed by the base station, but the location control for the assigned base station may be performed by the service control station. Is a pseudo base station
As a unit, the transfer function to the transfer destination terminal may be performed, and the registration request from another terminal may be directly given to the service control station without using the base station by using the location registration information. Is also good.

Although the terms used in the claims are used in accordance with the embodiment, the terms in the modified embodiment are included.

(6) In the above embodiment, the transfer destination terminal in a general call transfer operation (call transfer operation other than when there is no response) is designated each time the registration operation is performed. It may be set at the time of conclusion and stored in the service control station, and when the allocation base station is determined, the mobile station information and the storage transfer destination terminal information thereof may be notified to the allocation base station.

(7) In addition, all PHs are
The call transfer service may be provided to the S terminal.

(8) In the above embodiment, the present invention is applied to PH.
Although it is shown that the present invention is applied to S, the present invention can be applied to other mobile communication systems because the base station and the service control station may be provided with a function unit for transferring an incoming call. it can. For example, the present invention can be applied to a cordless telephone system for business establishments including a PBX and a base station, and an exchange and a base station in a public mobile communication network. Therefore, the interface between the base station and the network side is not limited to the I'interface, and the incoming call sequence and the outgoing call sequence are not limited to those of the above embodiment.

[0095]

As described above, according to the present invention, the base station is provided with the call transfer service information storage section and the call transfer section.
Just by providing an incoming call transfer control unit in the service control station, incoming calls to the mobile station can be transferred to the transfer destination terminal, and there is no need to change the wired network side or to use a dedicated line for the incoming call transfer service with the wired network. , It is possible to minimize the improvement parts necessary for providing the service.

[Brief description of drawings]

FIG. 1 is a block diagram of a mobile-addressed call transfer system according to an embodiment.

FIG. 2 is an explanatory diagram of a conventional call transfer method.

FIG. 3 is an explanatory diagram of a conventional problem.

FIG. 4 is a sequence diagram showing a service registration operation by the contracted mobile station of the embodiment.

FIG. 5 is a flowchart (No. 1) showing a method of determining a base station that executes a call transfer operation according to the embodiment.

FIG. 6 is a flowchart (No. 2) showing the method of determining the base station that executes the call transfer operation of the embodiment.

FIG. 7 is a sequence diagram for explaining location registration of a call transfer execution base station according to the embodiment.

FIG. 8 is a processing flowchart of a call transfer operation based on setting registration of the embodiment.

FIG. 9 is an image diagram of call transfer based on setting registration of the embodiment.

FIG. 10 is a sequence diagram showing a registration cancellation operation by the contracted mobile station of the embodiment.

FIG. 11 is a sequence diagram showing a registration operation for no response in the embodiment.

FIG. 12 is a sequence diagram showing a call transfer operation when there is no response from the mobile station according to the embodiment.

[Explanation of symbols]

20 ... Fixed network (digital network), 21 ... Position registration part, 22-1, 22-2 ... Fixed terminal, 30-A1-30-A3, 30-B1-30-B3 ... Base station (CS), 30- A2, 30-B2 ... Representative base station, 31 ... Mobile station (PHS terminal: PS), 32 ... Service control station (SCP), 33-A2, 33-B2 ... Call transfer unit, 34-A2, 34-B2 ... Call forwarding service information storage unit, 36 ... Call forwarding control unit, AR-A, AR-B ... Calling area.

Claims (7)

[Claims] 1. In a mobile communication system in which a plurality of base stations capable of accommodating mobile stations and a service control station having an authentication function unit are connected to a wired network having a location registration unit, a call transfer operation is performed. The call transfer service information storage unit that updates and stores the information of the mobile station and the transfer destination terminal to be executed according to the information from the outside, and the mobile station related to the call are stored in this call transfer service information storage unit. At this time, an incoming call transfer unit for transferring the incoming call to the corresponding transfer destination terminal is provided in all or some of the base stations, and a call to the mobile station during service registration reaches a predetermined base station, A call transfer control unit for controlling update of the contents stored in the call transfer service information storage unit and the position registration unit so that the base station can execute an incoming call to the transfer destination terminal,
A mobile station addressed call transfer system provided in the service control station. 2. The call transfer control unit, when requesting registration of a call transfer service from a mobile station, executes a call transfer related to the mobile station of a base station having the lowest communication charge with the transfer destination terminal. The mobile station call transfer system according to claim 1, wherein the storage contents of the call transfer service information storage unit of the determined base station and the position registration unit are updated. 3. The incoming call addressed to a mobile station according to claim 2, wherein the incoming call transfer control unit determines the base station that executes the incoming call transfer even if the traffic volume of each base station is small or large. Transfer system. 4. The call transfer control unit, when authentication for new location registration from a predetermined mobile station is requested, transfers the call when the mobile station does not respond to a call for a predetermined time. Recognizing the representative base station to be automatically executed, updating the stored contents of the incoming call transfer service information storage unit and the position registration unit of the recognized representative base station, the incoming call transfer unit of the representative base station, The call transfer to the transfer destination terminal stored in the call transfer service information storage unit is executed when there is no incoming call response from the predetermined mobile station for a predetermined time. The call transfer system for mobile stations as described in crab. 5. A call transfer service information storage unit for updating and storing information on a mobile station executing a call transfer operation and a transfer destination terminal according to information from the outside, and a mobile station relating to a call, A base station of a mobile communication system, comprising: an incoming call transfer unit that transfers the incoming call to a corresponding transfer destination terminal when stored in the service information storage unit. 6. A call transfer service information storage unit that updates and stores information of a mobile station and a transfer destination terminal that execute a call transfer operation when there is no response, and a mobile station related to a call, A base station of a mobile communication system, comprising: an incoming call transfer unit which is stored in the incoming call transfer service information storage unit and transfers the incoming call to a corresponding transfer destination terminal when there is no response for a predetermined time. . 7. An incoming call provided in a base station such that a call to a mobile station during registration of an incoming call transfer service reaches a predetermined base station and the base station can execute an incoming call to a transfer destination terminal. A service control station of a mobile communication system, comprising: an incoming call transfer control unit that updates and controls the contents stored in a transfer service information storage unit and a location registration unit under the wired network.