JPH0955980A - Incoming call connection method for mobile station - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the incoming call connecting rate by making a incoming call inhibiting state when confirming an authorized mobile station by authentica tion. SOLUTION: When a call incomes, a timer 31 is started and a call incoming request 30 is sent to mobile stations 14 and 15 through base stations 12 and 13 which belong to the presently existing register zone. At the time of receiving a call-incoming response 36 from the illegal mobile station 14 which does not make a contact with this system, an authentication request request 38 is outputted to the mobile station 14 to investigate the authentication response by an authentication part 24 and at the time of judging it to be illegal, a cutting processing 43 is given to the mobile station 14. When a call-incoming response 44 from the authorized mobile station 15 is received and authentication to this is given. Then upon judging this mobile station 15 to be authorized, a timer 31 is stopped to make the call-incoming response into a rejecting state to follow a termination connection procedure 51 to the mobile station 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of connecting an incoming call to a mobile station in mobile communication.

[0002]

2. Description of the Related Art FIG. 5A shows a portion related to the present invention in a mobile communication system. The communication control device 11 is usually provided in a mobile station subscriber switching center, and when an incoming call is made to the mobile station, it sends an incoming call request signal to a plurality of base stations 12 and 13 belonging to the zone in which the mobile station is registered. Then, the base stations 12 and 13 radiate the incoming call request signals by the control channel radio waves and emit the incoming call request signals to the mobile stations 1 in the service area.
Send to 4, 15.

In the communication control device 11, as shown in FIG. 5B, the communication control unit transmits and receives signals for connection with the base station via the interface unit 22, and the timer control unit 23, the authentication unit 24, and the state management. It exchanges signals with the unit 25. The processing procedure of the communication control device 11 is shown in FIG. When an incoming call arrives from the network side, the state management unit 25 is first set to the incoming call acceptance state (S ₁ ), and an incoming call request signal is sent to each base station in the zone in which the mobile station corresponding to the incoming call is registered. Also, a timer setting request is issued to the timer control unit 23 (S ₂ ), an incoming response signal is waited (S ₃ ), and when the incoming response signal is received, the state management unit 25 is inquired about the state (S ₂ ).
₄ ). The state management unit 25 checks whether the incoming call is allowed (S ₅ ), and if the incoming call is allowed, notifies the communication control unit 21 of that (S ₆ ).

Upon receipt of this, the communication control unit 21 issues a timer stop request to the timer control unit 23, and the state management unit 2
5 is set to the incoming call non-permission state, and an authentication request signal is sent to the base station that sent the incoming call response signal (S ₇ ). After that, the authentication unit 24 is caused to check the authentication response signal received from the mobile station (S ₈ ). If there is a notification from the authentication unit 24 that a correct authentication result has been obtained (S ₉ ), the base station and the communication control device 11 are connected (S ₁₀ ), and the caller side and the mobile station are connected. A call is made. When the call ends (S
_11), and ends go the cutting of the line (S _12).

When the incoming call response signal is not received in step S ₃ , it is checked whether the timer has timed out (S ₁₃ ). If it has not timed out, the process returns to step S ₃ and if it has timed out, it is checked whether it is the second time out. (S _14), if the second time-out step S
Returning to step ₂ , the incoming call request signal is sent again, and if the second time-out occurs, the process ends. If the incoming call is not permitted in step S ₅ of the state management unit 25, the communication control unit 21 is notified that the incoming call is not permitted (S ₁₅ ), and the communication control unit 21 receiving this notification performs the line disconnection process. Perform (S ₁₂ ).

The conventional incoming call connection method will be described in detail with reference to FIG. (1) The communication control unit 21 in the communication control device 11 transmits an incoming call request signal 30 to the base station 12 and the base station 13 in the zone in which the mobile station to be called is registered, and receives the incoming call response. Allow signal reception. (2) At the same time as the transmission of the incoming call request signal 30, the communication control unit 2
1 transmits a signal 32 requesting the setting of the timer 31 which is activated for a fixed time to the timer control unit 23.

(3) The timer control section 23 sets the timer 31. (4) The base station 12 having received the incoming call request signal 30 transmits the incoming call request signal 33 to the mobile station 14. (5) The base station 13 having received the incoming call request signal 30 transmits the incoming call request signal 34 to the mobile station 15.

(6) An unauthorized mobile station 14 not contracted with the communication control device 11 transmits an incoming call response signal 36 to the incoming call request signal 33 to the base station 12. (7) The base station 12 that has received the signal 36 transmits the incoming call response signal 36 ′ to the communication control unit 21 in the communication control device 11. (8) The communication control unit 21 transmits a timer stop request signal 37 to the timer control unit 23 to disallow the subsequent incoming call response.

(9) The timer control unit 2 which has received the signal 37
3 stops the timer 31. (10) The communication control unit 21 transmits an authentication request signal 38 for confirming the legitimacy of the mobile station 14 to the base station 12 which has transmitted the incoming response signal 36 '. (11) The base station 12 that has received the signal 38
The authentication request signal 38 'for confirming the validity of

(12) The unauthorized mobile station 14 that has received the signal 38 'receives the authentication response signal 39 for the authentication request 38'.
Is transmitted to the base station 12. (13) The base station 12 that has received the signal 39 transmits an authentication response signal 39 ′ to the communication control unit 21 in the communication control device 11. (14) The communication control unit 21 determines the content of the signal 39 'from the authentication unit 2
4 and makes an authentication confirmation request 41.

(15) The authentication unit 24 checks the authentication response signal 39 'transmitted by the mobile station 14 via the base station 12, determines that the mobile station 14 is invalid, and sends an authentication confirmation notification for notifying the fact. The signal 42 is transmitted to the communication control unit 21. (16) Based on the content of the signal 42, the communication control unit 21 transmits a disconnection signal 43 to the base station 14 in order to reject the incoming connection to the unauthorized mobile station 14, and performs the connection processing with the base station 14. finish.

(17) The base station 12 which receives the signal 43
Transmits a disconnection signal 43 ′ to the unauthorized mobile station 14 and ends the connection processing with the unauthorized mobile station 14. (18) On the other hand, the legitimate mobile station 15 having a contract with the operator providing the mobile communication system sends the incoming call request signal 1
The signal 44 of the incoming call response to No. 5 is transmitted to the base station 13.

(19) Base station 13 which has received signal 44
Transmits an incoming call response signal 44 ′ to the communication control unit 21 in the communication control device 11. (20) Since the reception of the incoming call response is not permitted, the communication control unit 21 transmits a disconnection signal 45 to the base station 13 to reject the incoming connection to the legitimate mobile station 15, The connection processing with 13 is terminated.

(21) The base station 13 which has received the signal 45
Transmits a disconnection signal 45 'to the legitimate mobile station 15 and ends the connection processing with the legitimate mobile station 15.

[0015]

Conventionally, when there is an incoming call request to a mobile station, the timer control section 12 is notified to the timer control section 12 when the first incoming call response signal 36 for the incoming call request signal 30 from the communication control apparatus 11 is received. The mobile station 1 that has transmitted the signal 37 for requesting the stop of the timer 31 and has responded to the incoming call.
4 is selected as the mobile station for the incoming connection, but the incoming call response signal to the mobile station that responds after that is invalid because the communication control device 11 rejects the reception regardless of whether the mobile station is illegal or legitimate. The mobile station 14 uses the communication control device 1
When the incoming call response signal 36 is transmitted earliest in response to the incoming call request signal 30 from 1, the legitimate mobile station 15 does not select the incoming call connection target mobile station even if it sends the incoming call response signal 44, and the timer Since the termination request signal 31 is stopped and the incoming request signal is not retransmitted, the incoming call connection to the legitimate mobile station 15 cannot be performed.

[0016]

According to the present invention, when the legitimacy of the mobile station is verified on the basis of the incoming call response signal, if it is legitimate, even if a predetermined time has not elapsed from the transmission of the incoming call request. , Refuses to accept the subsequent incoming call response signal,
If it is not legitimate, it will not refuse acceptance of the incoming call response signal thereafter.

If a valid incoming call response signal is not received within a predetermined time, the incoming call request signal is sent out again, and the incoming call response signal is allowed to be received for a predetermined time from this time, and when a valid incoming call response signal is detected, the subsequent steps are performed. Reject the incoming call response signal.
In other words, according to the present invention, when it is confirmed by the authentication procedure that the mobile station is valid, the reception of the incoming call response signal after that is rejected.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a processing procedure of a communication control device 11 to which the present invention is applied, and the same processing parts as those in FIG. 6 are denoted by the same symbols. 5 is different from FIG. 5 in that when the incoming call response signal is received and the state management unit 25 is in the incoming call accepting state at that time, an authentication request signal is issued to the base station that transmitted the incoming call response signal in step S ₂₀ , but a timer stop request is issued. Don't give it
Further, the state management unit 25 is not brought into the incoming call non-permission state.

If the result of checking the authentication response signal from the mobile station is not valid (S ₂₁ ), the connection line with the mobile station is disconnected in step S ₂₂ without proceeding to step S ₁₂ . The process returns to step S ₃ and waits for the next incoming call response signal. If the mobile station in step S ₂₁ has authenticated that is legitimate, at this time, the timer control unit 23 in Step S ₂₃
A timer stop request is issued to the status management unit 25, and the status management unit 25 is set to the incoming call non-permission status, and then the connection processing with the base station is performed in step S ₁₀ .

A concrete processing example corresponding to FIG. 6 is shown in FIG. 2, and the corresponding portions are designated by the same reference numerals. In this embodiment, the communication controller 2 receives the incoming call response signal 36 from the mobile station 14.
When it is received by 1, the authentication request signal 38 for confirming the legitimacy of the mobile station 14 is transmitted to the base station 12 which has transmitted the incoming response signal 36 'without issuing a timer stop request. The unauthorized mobile station 14 receiving this signal 38
The authentication response signal 39 is returned via the base station 12.

The signal 39 of the authentication response is checked to determine that the mobile station 14 is illegal, and an authentication confirmation notifying signal 42 for notifying the fact is transmitted to the communication control section 21. Based on the content of this signal 42, the communication control unit 21 transmits a disconnection signal 43 to the base station 12 to reject the incoming connection to the unauthorized mobile station 14, and ends the connection processing with the base station 12. Further, the base station 12 ends the connection processing with the unauthorized mobile station 14.

On the other hand, after that, the legitimate mobile station 15 contracted with the operator who provides this mobile communication system.
However, when the incoming call response signal 44 is transmitted to and received by the communication control unit 21 in the communication control device 11, the communication control unit 21 sends the incoming call response signal 44 'to the base station 13 and the mobile station 15 Authentication request signal 46 for confirming the validity of

Upon receiving the signal 46, the base station 13 transmits an authentication request signal 46 'for confirming the validity of the mobile station 15. The legitimate mobile station 15 receiving the signal 46 '
An authentication response signal 47 for the authentication request signal 46 'is transmitted to the base station 13. The base station 13 receiving the signal 47
The authentication response signal 47 'is transmitted to the communication control unit 21 in the communication control device 11.

The communication control unit 21 transmits the content of the signal 47 'to the authentication unit 24 and makes an authentication confirmation request 48. The authentication unit 24 checks the authentication response signal 47 transmitted from the mobile station 15 via the base station 13, determines that the mobile station 15 is valid, and sends the authentication confirmation notification signal 49 for notifying the fact to the communication control unit 2
Send to 1.

The communication control unit 21 transmits a timer stop request signal 37 to the timer control unit 23 to disallow the subsequent incoming call response. The timer control unit 23 that has received the signal 37 stops the timer 31. Based on the content of the signal 49, the communication control unit 21 performs the incoming call connection procedure 51 for the legitimate mobile station 15 via the base station 13.

The communication control unit 11 and the legitimate mobile station 15 transit to the communicating state 52 via the base station 13. Claim 2
As a specific example of the invention of (1), an unauthorized mobile station responds earliest, but the legitimate mobile station cannot respond within the timer that allows the mobile station to accept the incoming call response signal to the first incoming call request signal. A case of responding during the second timer activation will be described with reference to FIG. Also in this case, FIG. 2 and FIG.
The same symbols are attached to the portions corresponding to.

As in the case of FIG. 2, the communication control unit 21 sends out the incoming call request signal 30, and the unauthorized mobile station 14 sends an incoming call response signal in response to this, and as a result of the authentication to the mobile station 14, the mobile station 14 is authenticated. Is determined to be improper, the disconnection process is performed to reject the incoming connection to the improper mobile station 14, and then the timer 31 expires. A timer 54 that transmits a signal 53 to the communication control unit 21 and that is activated for a certain period of time
Set.

Upon receiving the signal 53, the communication control unit 21 transmits an incoming call request signal 55 to the base station 12 and the base station 13. The base station 12 that receives this transmits an incoming call request signal 56 to the mobile station 14, and the base station 13 that receives the signal 55 sends an incoming call request signal 57 to the mobile station 15. A legitimate mobile station 15 that has a contract with an operator providing this mobile communication system transmits a signal 58 of an incoming call response to the signal 57 to the base station 13, and the base station 13 that receives the signal 58 receives the incoming call response. The signal 58 ′ is transmitted to the communication control unit 21.

The communication control unit 21 having received the signal 44 transmits an authentication request signal 46 for confirming the validity of the mobile station 15 to the base station 13 which has transmitted the incoming call response signal 44, and FIG. As shown in FIG. 5, the validity of the mobile station 15 is authenticated, and the authentication confirmation notification signal 49 is transmitted to the communication control unit 21.
Is received, the communication control unit 21 transmits a timer stop request signal 37 to the timer control unit 23, disallows subsequent incoming call response reception, and the legitimate mobile station 15 via the base station 13 The incoming call connection procedure 51 is performed by the communication control device 1
1 and the legitimate mobile station 15 transit to the communicating state 52 via the base station 13.

As an embodiment of the third and fourth aspects of the invention, a legitimate mobile station and an unauthorized mobile station are provided in a timer which allows the communication control device to accept an incoming call response signal from the mobile station in response to the first incoming call request signal. A case will be described with reference to FIG. 4 in which the incoming call processing is terminated if the call cannot be answered and the second timer does not respond. Also in this case, the parts corresponding to those in FIGS.

As in FIG. 2, the communication control unit 21 transmits the incoming call request signal 30 to the base station 12 and the base station 13 to allow reception of the incoming call response, and at the same time, activates the timer control unit 23 for a certain period of time. A signal 32 requesting the setting of the timer 31 is transmitted. The base stations 12 and 13 are mobile stations 1 respectively.
Incoming call request signals 33 and 35 are transmitted to 4 and 15.
However, the timer control unit 23 detects that the timer 31 has expired before the incoming call response signal to the signal is received,
Sends a resend request signal 53 of the incoming call request signal to the communication control unit 21, and sets a timer 54 which is activated for a certain period of time. The communication control unit 21 sends the incoming request signal 55 to the base station 1
2 and 13, and the base stations 12 and 13 transmit incoming request signals 56 and 57 to the mobile stations 14 and 15, respectively. However, the timer 54 expires before the incoming call response signal is received, and the incoming call process ends.

As has been done in the past, the state management unit 25 may be omitted and the incoming call is allowed when the timer is running and may be processed when the timer is stopped.

[0033]

As described above, in the prior art, when the incoming call response signal from the mobile station is first received, the mobile station that has transmitted the incoming call response is selected as the incoming mobile station because the incoming call is not permitted. If a legitimate mobile station sends an incoming call response signal, but it is delayed in time from the incoming call response of an unauthorized mobile station, the legitimate mobile station is not selected as the incoming mobile station, and the incoming call is not allowed. Therefore, the incoming request signal is not retransmitted. However, in the present invention, since the incoming call non-permission state is set when the legitimate mobile station is confirmed by the authentication, even if the incoming call response of the legitimate mobile station lags behind the unauthorized mobile station in time, Since the response signal can be accepted and the call request signal can be retransmitted when the predetermined time in the incoming call allowable state has expired in the inventions of claims 2 and 3, only the legitimate mobile station can be selected as the incoming mobile station. There are advantages.

[Brief description of drawings]

FIG. 1 is a flowchart showing a processing procedure of a communication control unit and a state management unit in the method of the present invention.

FIG. 2 is a diagram showing an incoming connection sequence in the embodiment of the invention of claim 1;

FIG. 3 is a diagram showing an incoming call connection sequence in an embodiment of the invention of claims 2 and 3;

FIG. 4 is a diagram showing an incoming connection sequence in the embodiment of the invention of claim 4;

FIG. 5 is a block diagram showing a portion related to the present invention in a mobile communication system, and B is a diagram showing a functional configuration of the communication control device 11 thereof.

FIG. 6 is a flowchart showing a processing procedure of a communication control unit and a state management unit in the conventional incoming call connection method.

FIG. 7 is a diagram showing an incoming call connection sequence according to a conventional method.

Claims (4)

[Claims] 1. An incoming call request signal is simultaneously transmitted from a communication control device to a plurality of mobile stations via a plurality of base stations, and at the same time,
When the incoming response signal for the incoming call request signal is received from the mobile station through the base station and received by the communication control device, the mobile station that has sent the incoming call response signal is received. The legitimacy of
In the mobile station incoming call connection method for performing incoming call connection processing to a legitimate mobile station, if the legitimacy is not verified when the above legitimacy is verified, the subsequent acceptance of incoming call response signals is not rejected and Once the sex is verified, even if the above specified time has not elapsed,
A mobile station incoming connection method characterized by refusing to accept subsequent incoming call response signals. 2. The incoming call connection method according to claim 1, wherein when an incoming call response signal from a legitimate mobile station is not received when the predetermined time has elapsed, an incoming call request signal is sent again.
Mobile station incoming connection characterized by allowing the incoming call response signal to be received for a predetermined period of time, and rejecting subsequent incoming call response signals when an incoming call response signal from a valid mobile station is detected within that time. Method. 3. The incoming call connection method according to claim 1, wherein if the incoming call response signal is not received within the predetermined time, the incoming call request signal is retransmitted when the predetermined time elapses, and the incoming call response is received for the predetermined time. A mobile station incoming connection method characterized by allowing reception of a signal. 4. The incoming call connection method according to claim 2 or 3, wherein after the incoming call request signal is retransmitted, if an incoming call response signal from a valid mobile station is not received within a predetermined time, the incoming call process is terminated. Mobile station incoming connection method.