JPH0358598A - Squelch on-hook recalling system - Google Patents

Abstract

PURPOSE:To restart a call between a moving terminal and a subscriber as a called party by providing a call re-incoming means in a traveling body exchange so that the call can be restarted with the subscriber as the called party in a holding state when the re-incoming of a call is repeated to the moving terminal and the moving terminal makes a response. CONSTITUTION:A call re-incoming means 100 holds connection to a subscriber 2 as the called party when a radio base station 4 detects the gradation of transmission quality in a radio line 6 to a moving terminal 5 and transmits a squelch on-hook signal to a traveling body exchange 1. After the connection to the moving terminal 5 is once released, the re-incoming of the call is repeated to the moving terminal 5 and when the moving terminal 5 makes the response, the call is restarted with the subscriber 2 as the called party in the holding state. Thus, when the transmission quality is recovered in the radio line between the moving terminal and radio base station, the moving terminal can start the call with the subscriber as the called party again.

Description

[Detailed Description of the Invention] [{Already required] This invention relates to squelch end call re-call method 2 in a mobile communication system that connects a mobile terminal to a partner subscriber via a non-VA base station and a mobile switching equipment. The purpose of this is to make it possible to resume interrupted calls to the mobile terminal as much as possible when the transmission quality of the wireless line between the wireless base station and the mobile terminal deteriorates temporarily. When deterioration in transmission quality is detected on the wireless line and a squelch end signal is transmitted to the mobile exchange, the connection to the other party is put on hold, the connection to the mobile terminal is temporarily released, and the call is repeated to the mobile terminal. , the mobile exchange is equipped with a call re-terminating means that resumes the call with the other subscriber on hold when the mobile terminal answers, and the call re-terminating means re-terminating the call to the mobile terminal that was once released. As a result of repeating this, if the mobile terminal does not respond within a predetermined time, the other subscriber is connected to the message storage means, and messages from the other subscriber to the mobile terminal are stored. .

[Industrial application field]

The present invention relates to a squelch call-return method in a mobile communication system that connects a mobile terminal to a partner subscriber via a radio base station and a mobile exchange.

Mobile terminals such as car phones or mobile phones are connected via wireless lines to wireless base stations installed in each predetermined service area. Transmission quality may deteriorate due to obstacles such as objects.

[Conventional technology]

FIG. 4 is a diagram showing an example of a conventional mobile communication system, and FIG. 5 is a diagram showing an example of the squelch call termination process in FIG. 4.

In FIG. 4 and FIG.
BWT) 1 3, call path p1 and call trunk (TRK) 1 set within network (NW) 1 1
Assume that the subscriber 2 is connected to the other subscriber 2 via the subscriber 2 and is in a conversation state.

In this state, the mobile terminal (MSS) 5 enters a tunnel, for example, and the mobile terminal (MSS) 5 connects to the wireless base station (MBS).
) 4 drops below a specified value, the squelch unit 41 in the wireless base station (MBS) 4 detects the drop in radio field strength and transmits a disconnection command a to the mobile terminal (MSS) 5. At the same time, a squelch end signal b is repeatedly sent to the mobile exchange 1 via the radio channel control unit (MCU) 3 at regular intervals.

In the mobile switch 1, a central processing system (CP) 1
When the squelch call termination signal b transmitted from the wireless base station (MBS) 4 is detected, the squelch call termination processing unit 141 is activated.

The activated squelch call termination processing unit j41 releases the communication path p set in the network (NW) 11, and connects the wireless base station (
MBS) 4 transmits a mobile call termination confirmation signal C, and transmits a restoration signal d to the other subscriber 2.

When the wireless base station (MBS) 4 detects the mobile call termination confirmation signal C transmitted from the mobile exchange 1, it stops sending out the squelch call termination signal b.

As a result of the above, the connection between the mobile terminal (MSS) 5 and the opposite subscriber 2 is released.

[Problem to be solved by the invention]

As is clear from the above explanation, in a conventional mobile communication system, a mobile terminal (MSS) 5 and a radio base station (
When the transmission quality of the wireless line 6 between the mobile station (MSS) 4 and the wireless base station (MBS) 4 deteriorates and the wireless base station (MBS) 4 sends out a squelch termination signal b, the mobile switching equipment 1 Since the connection with the subscriber 2 is cut off, there is a problem in that the reliability and serviceability of the mobile communication system are significantly impaired.

SUMMARY OF THE INVENTION An object of the present invention is to make it possible to resume an interrupted call of a mobile terminal as much as possible when the transmission quality of a radio link between a mobile terminal and a radio base station temporarily deteriorates.

[Means to solve the problem]

FIG. 1 is a diagram showing the principle of the present invention.

In FIG. 1, 1 is a mobile switching equipment, 4 is a wireless base station,
5 is a mobile terminal; 6 is a wireless line connecting the wireless base station 4 and the mobile terminal 5; 2 is a subscriber on the other end of the conversation with the mobile terminal 5; 20
0 is a message storage means.

Reference numeral 100 denotes a re-termination means provided in the mobile exchange 1 according to the present invention.

[Operation] The call repeating means 100 detects deterioration in transmission quality in the radio line 6 between the radio base station 4 and the mobile terminal 5, and
When a squelch end signal is transmitted to the other subscriber 2, the connection to the other party 2 is suspended, the connection to the mobile terminal 5 is once released, and the call is repeated to the mobile terminal 5, and when the mobile terminal 5 responds, To resume a call with a subscriber 2 on hold.

Note that the call re-termination means 100 connects the other subscriber 2 to the message storage means 200 when the mobile terminal 5 does not respond within a predetermined time as a result of repeated re-termination to the mobile terminal 5 that has been once released. Messages sent from the other subscriber 2 to the mobile terminal 5 are stored.

Therefore, if the transmission quality of the wireless link between the mobile terminal and the wireless base station is restored, the mobile terminal can resume talking with the other party, and if the mobile terminal does not respond to the call again, It also becomes possible to connect the other subscriber to the message M storage means and entrust the message, thereby preventing a decline in the reliability and service of the mobile communication system.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a diagram showing a mobile communication system according to an embodiment of the present invention, and FIG. 3 is a diagram showing an example of the squelch re-arrival processing process in FIG. 2. Note that the same reference numerals indicate the same objects throughout the figures.

In FIG. 2, a squelch end call repeating unit 142 is provided in the central processing system (CP) 14 in the mobile switching system 1 as the call repeating means 100 in FIG.

In FIG. 2 and FIG.
BWT) 13, the communication path p1 and communication trunk (TRK) 12 set within the network (NW) 1
Assume that the user is connected to the other subscriber 2 via , and is in a conversation state.

In this state, the mobile terminal (MSS) 5 enters a tunnel, for example, and the mobile terminal (MSS) 5 connects to the wireless base station (MBS).
) 4 drops below the specified value, the squelch unit 41 in the wireless base station (MBS) 4 detects a drop in the radio field strength as described above, and disconnects the mobile terminal (MSS) 5. In addition to transmitting command a, the radio network control station (
A squalch termination signal b is repeatedly sent to the mobile exchange 1 via the MCU) 3 at regular intervals.

In mobile exchange [1, central processing unit (CP) 1
When the squelch end signal b transmitted from the wireless base station (MBS) 4 is detected, the squelch end call re-termination section 142 is activated.

The activated squelch end call re-termination unit 142 temporarily releases the communication path ρ1 set within the network (NW) 11, and connects it to the wireless base station (MBS) 4 via the wireless network controller (MCU) 3. A release signal e is transmitted to.

Next, the squelch end call re-termination unit 142 connects the network (
NW) l Set up a call path p2 in I to create a call trunk (
Connect TRK) 12 and talkie device (TKY) 15,
The callback message f generated by the talkie device (TKY) 15 is sent to the call path p2 and the call trunk (TRK) 12.
The mobile station (MSS) 5 with which the call was made is sent to the other subscriber 2 via the mobile terminal 2 to notify that the mobile terminal (MSS) 5 with which the call was made will be recalled, and the mobile station (MBS) via the radio network controller (MCU) 3
4, a re-arrival signal g to the mobile terminal (MSS) 5 is repeatedly transmitted at predetermined intervals (for example, at intervals of 1 to 30 seconds).

The radio base station (MBS) 4 that has received the re-arrival signal g transmits the incoming signal h to the mobile terminals (MSS) 5 all at once.

Eventually, the mobile terminal (MSS) 5 pulls out of the tunnel, the transmission quality of the wireless line 6 is restored, and the mobile terminal (MSS) 5 that has received the incoming signal h transmits the incoming response signal i to the wireless base station CM.
BS) 4, the radio base station (MBS) 4 returns an incoming call acceptance signal j to the mobile exchange 1 via the radio network control unit (MCU) 3.

In the mobile switching equipment 1, the Skylch terminated call re-termination section 14
When 2 detects the incoming call acceptance signal j returned from the wireless base station (MBS) 4, it stops sending out the re-incoming signal g, and then
It captures the mobile side trunk (MBWT) 13 and transmits an incoming line setting signal k to the radio base station (MBS) 4 via the radio network controller (MCU) 3.

Radio base station (MBS) 4 that received the incoming line setting signal k
configures a wireless line 6 for the mobile terminal (MSS) 5, sends a conduction signal m to the configured wireless line 6, and when the conduction signal m is returned from the mobile terminal (MSS) 5, the wireless line It is determined that the continuity test for 6 has been successfully completed, and a continuity completion signal n is sent back to the mobile exchange 1 via the radio network control unit (MCU) 3.

In the mobile exchange @1, the squelch end call re-termination section 14
When 2 detects the conduction completion signal n returned from the radio base station (MBS) 4, it transmits a call start command signal 0 to the radio base station (MBS) 4 via the radio network control unit (MCU) 3, and Network (NW) 1 Call path p being set up in 1! is released and a communication path p is set up, and the call generated by the ring tone source (RBT) 16 is returned to the other party 2 via the communication path p3 and the communication trunk (TRK) 12.

On the other hand, the wireless base station (MB
S)4 transmits the paging command signal p to the mobile terminal (MSS) 5'.

The mobile terminal (MSS) 5 that has received the paging command signal p sounds a paging signal tone.

When the subscriber of the mobile terminal (MSS) 5 hears the ringing signal tone and raises the handset, the mobile terminal (MSS) 5 returns a response signal r to the radio base station (MBS) 4.

The radio base station (MBS) 4 that has received the response signal r returns a mobile response signal S to the mobile exchange 1 via the radio network control unit (MCU) 3.

In the mobile exchange 1, the squelch call termination unit 14
2 detects the mobile response signal S returned from the wireless base station (MBS) 4, it releases the communication path p3 being set in the network (NW) 11, sets up the communication path p1, and connects the communication trunk (TRK). ) 12 and mobile trunk (MBWT)
)1 Connect with 3.

As described above, the mobile terminal (MSS) 5 and the opposite subscriber 2 are connected again to the radio line 6, the radio base station (MBS) 4, the radio network controller (MCU) 3, and the mobile side trunk (MBWT) of the mobile exchange 1. 1 3. Call path p1 and call trunk (TRK) 1 set within network (NW) 1 1
2, and the call can be resumed.

Note that after the mobile switching equipment 1 transmits the release signal e to the radio base station (MBS) 4 via the radio network controller (MCU) 3, the mobile terminal (MS)
S) 5 moves out of the service area of the radio base station (MBS) 4, the mobile switching equipment 1
CU) 3 to the radio base station (MBS) 4 at predetermined intervals, and the radio base station (MBS) 4 that has received the repeat arrival signal g transmits the incoming signal to the mobile terminal (MSS) 5. Even if h is sent all at once, the mobile terminal (MSS)
5 does not return the incoming call response signal i.

In this state, when the squelch end call re-terminating section 142, which is repeatedly transmitting the re-incoming signal g, detects that a predetermined time T (for example, 3 minutes) has elapsed, the squelch end call re-terminating section 1
42 is the communication path p being set up in the network (NW) 11
After releasing t, a communication path p4 is set within the network (NW) 11 to connect the communication trunk (TRK) 12 to one terminal of the intra-office trunk (TIOT) 17, and a known message connection section 143 Start.

The activated message connection unit 143 connects to the network (NW)
1 Set up a communication path p, within 1, and connect the local trunk (TI
Voice response device W (ART) 1 is connected to the other terminal of OT) 17.
B, and the voice response device (ART) 1B sends an answering machine connection message t indicating that an answering machine service will be provided, to the call path p,, the in-office trunk (TIOT) 17,
After returning to the other subscriber 2 via the communication path P4 and the communication trunk (TRK) 12, the network (NW) 1
1, and release the communication path p5 set within the communication path p6.
, and connect the other end of the local trunk (Tl○T) 17 and the terminal to the VS opposite bidirectional trunk (VCSBWT) 19.

As a result of the above, the other subscriber 2 uses the call trunk (TRK 1)
2. Communication path T'S within the network (NW) l, local office 73) (TrOT) 1 7, connection to message stacking device 7 via communication path Pad and VS opposite bidirectional trunk (VCSBWT) 19 and records the message U entrusted by the other subscriber 2.

As is clear from the above description, according to the present embodiment, from the mobile terminal (MSS) 5 in a call state to the radio base station (MBS)
S) Even if the strength of the radio waves reaching the wireless base station (MBS) 4 is lower than the specified value and the squelch end signal b is transmitted from the wireless base station (MBS) 4 to the mobile switching equipment 1, the mobile terminal (MSS) 5 was repeatedly attempted to receive the call again.
When the propagation conditions of the wireless line 6 are restored and the mobile terminal (MSS) 5 responds within a predetermined time T, the communication is reconnected to the other subscriber 2 who was on hold during that time, and a conversation becomes possible.

tl: The mobile terminal (
If the mobile terminal (MSS) 5 does not respond, it is also possible to connect the other subscriber 2 to the answering machine function and leave a message for the mobile terminal (MSS) 5.

Note that FIGS. 2 and 3 are only one embodiment of the present invention, and for example, the elapse of the predetermined time T during an attempt to receive a call again is limited to being timed only by the squelch end call repeating unit 142. Without any problem, the radio channel control station (MCtJ) 3 also measures time in parallel, and the radio channel control station (MCU) 3, which detects the elapse of the predetermined time T, transmits the absence notification signal V to the mobile exchange 1. Many other modifications may be considered, such as, but the effects of the present invention remain the same in any case.

Note that, apart from the present invention, the mobile exchange 1 that receives the squelch call termination signal b immediately activates the answering machine function and sends the message U to the other subscriber 2 without activating the squelch call termination unit 142. [A system that does not perform call re-termination is outside the scope of the present invention (see claims)], but in combination with the present invention, a squelch end call re-termination unit is also considered. 142 and try to receive the call again, or
Alternatively, the mobile terminal (MS)
S) Many other modifications are considered, such as specifying every 5, but the effect of the tree invention remains the same in either case.

〔Effect of the invention〕

As described above, according to the present invention, in the mobile communication system, when the propagation conditions of the radio line of sight between the mobile terminal and the radio base station are restored, the mobile terminal can resume talking with the other subscriber, and furthermore, If the mobile terminal does not respond to the call again, it becomes possible to connect the other subscriber to the answering machine function and leave a message, thereby preventing a decline in the reliability and serviceability of the mobile communication system. .

[Brief explanation of drawings]

FIG. 1 is a diagram showing the principle of the present invention, FIG. 2 is a diagram showing a mobile communication system according to an embodiment of the present invention, and FIG.
FIG. 4 is a diagram showing an example of a conventional mobile communication system, and FIG. 5 is a diagram showing an example of the squelch call termination process in FIG. 4. In the figure, 1 is a mobile exchange, 2 is a partner subscriber, 3 is a radio network controller (MCU), and 4 is a radio base station (MBS).
), 5 is a mobile terminal (MSS), 6 is a wireless line, 7 is a message storage device, 1l is a network (NW), 12 is a call trunk (TRK), 13 is a mobile side trunk (MBWT)
, 14 is the central processing system unit (cp), 15 is the talkie device (TKY), 16 is the ring tone source (RBT), 17 is the local trunk (TTOT), and 18 is the voice response device (ART).
), 19 is VS opposing bidirectional to 'y7') (VCSBWT
), 41 is a squelch unit, 100 is a call repeating means, 141 is a squelch call termination processing unit, and 142 is a squelch call termination re/¥-c
a,) n7i n+u brown/figure%21f2::E+γ combination. i+1 Kei Chobu 841
5) Yoichiko

Claims (2)

[Claims] (1) In a mobile communication system in which a mobile terminal (5) is connected to a partner subscriber (2) via a radio base station (4) and a mobile exchange (1), the radio base station (4) is connected to the When deterioration in transmission quality is detected in the wireless line (6) between the mobile terminal (5) and a squelch termination signal is transmitted to the mobile exchange (1), the connection to the other party (2) is terminated. On hold, the mobile terminal (
After once releasing the connection to the mobile terminal (5),
), and when the mobile terminal (5) responds, the mobile exchange (1
) is a squelch end call recall system. (2) When the mobile terminal (5) does not respond within a predetermined time as a result of repeatedly re-terminating the call to the once-released mobile terminal (5), the re-terminating means (100) A squelch end call re-call system characterized in that the other party subscriber (2) is connected to a message storage means (200) and messages from the other party subscriber (2) to the mobile terminal (5) are stored.