JPH0595323A - Simplex group talking interruption system - Google Patents

Abstract

PURPOSE:To detect give-up of dialing on its way to a calling mobile station even during the operation of an automatic reply timer by sending an interruption request signal from a caller mobile station when the caller station gives up its call before the station receives a talking start signal sent from a radio base station. CONSTITUTION:A radio base station 7 receiving call information 16 sends a bell ring signal 17 to a caller mobile station 1 through an outgoing talking channel and sends a cell signal 18 to called mobile stations 2, 3 through an outgoing control channel. Simultaneously, a base station controller 6 starts an automatic reply timer 19 to stop the monitoring of an incoming carrier through a talking channel and a talking monitor signal 14. When the caller mobile station 1 gives up its talk on its way, an interrupt request signal 20 is sent through the incoming control channel. The radio base station 7 receives the signal 20 and sends an interruption signal 21 to an exchange station 8. The radio base station 7 receiving a talking channel open signal 22 from the exchange station 8 turns off a talking channel radio equipment 5 and sends a cell termination signal 23 to the outgoing talking channel to release the called mobile stations 2, 3 and to terminate the talk.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a mobile communication system,
In particular, the present invention relates to a simplex group call disconnection method for group calls in simplex.

[0002]

2. Description of the Related Art A conventional simplex group call disconnection method will be described with reference to FIG.

A mobile station capable of simplex group call, a radio base station for transmitting and receiving radio waves to and from the mobile station, a base station control device for controlling the radio base station, and a mobile station through the base station control device. In a mobile communication system including a switching center that controls connection to a public line, the base station control device 6 receives a calling signal 9 of an uplink control channel from a calling mobile station 1 and receives the received calling signal. The call signal 9 is relayed to the exchange 8. Next, the exchange 8 sends a call channel signal to the base station controller 6 in order to assign a call channel to the originating mobile station 1. Upon receiving the call channel signal, the base station control device 6 sends the call channel signal 13 to the downlink control channel through the control channel radio 4 and, at the same time, puts the corresponding call channel radio 5 into the operating state and the call monitoring signal 12 to the downlink call channel. Is sent.

The originating mobile station 1 that has received the call channel assignment signal 13 broadcast on the downlink control channel moves to the received call channel, receives the call monitoring signal 12 broadcast on the downlink call channel, and then receives the call channel on the uplink. Then, the carrier is sent to and the call monitoring signal 14 that is the same as the call monitoring signal 12 broadcast on the downlink communication channel is transmitted to the uplink communication channel. The base station control device 6 that has received the carrier of the upstream communication channel and the communication monitoring signal 14 is the exchange 8
A call channel connection completion signal 15 is used to report the call channel connection completion.

When the call channel connection of the originating mobile station 1 is completed, the exchange 8 issues a call signal containing information on the same call channel as the call channel assigned to the originating mobile station 1 to the terminating mobile station 2 to the base station controller. Send to 6. Upon receiving this calling signal, the base station control device 6 sends a group calling signal on the downlink control channel, sends a bell ringing signal to the originating mobile station 1 through the downlink call channel, and starts an automatic response timer to start the call channel. Stop monitoring the carrier and call monitoring signals. The originating mobile station 1 that has received the bell ringing signal stops the transmission of the carrier and call monitoring signal 14. The receiving mobile station 2 that has received the group call signal shifts to the call channel assigned by the group call signal, but does not send out the carrier and call monitor signal until it receives the call start signal from the radio base station 7.

When the automatic response timer times out,
The base station control device 6 sends a response signal to the exchange 8 and a call start signal to the originating and terminating mobile stations, respectively, and thereafter, the calls between the mobile stations can be performed by the press-to-talk method. At the same time, the base station control device 6 restarts the monitoring of the carrier of the upstream communication channel and the communication monitoring signal 14. When the base station control device 6 recognizes that either the carrier of the upstream communication channel or the communication monitoring signal is continuously turned off for a predetermined fixed length of time, it determines that it is disconnected and sends a disconnection signal to the exchange 8. 21 and a call channel release signal 22 to the mobile station, and the call ends.

[0007]

In the above-described conventional simplex group call disconnection method, after the caller of the originating mobile station makes a call, the call is abandoned halfway during the operation of the automatic response timer of the base station controller. However, the base station controller cannot detect this midway abandonment, the base station controller's automatic response timer times out, and after a call is started only for the called party with no caller There is a drawback that the carrier cannot be disconnected until the base station controller detects that the carrier does not exist for a certain period of time or longer.

[0008]

According to the simplex group call disconnection method of the present invention, a mobile station capable of simplex group calls, a radio base station for transmitting and receiving radio waves of the mobile station, and a control for the radio base station are provided. In a mobile communication system composed of a base station control device, and a switching center that controls the connection between the mobile station and a general public line through the base station control device,
When a simplex group call between a plurality of mobile stations is started, the call is abandoned halfway after the mobile station on the calling side changes to the call channel and before receiving the call start signal transmitted from the radio base station. In this case, the originating mobile station sends a disconnection request signal to the radio base station through an uplink control channel.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing a signal sequence for explaining an embodiment of the present invention. The originating mobile station 1, the terminating mobile station 2 and the terminating mobile station 3 are subscribers belonging to the same group. The radio base station 7 includes a control channel radio 4 and
A call channel radio 5 and a base station controller 6 are included.
The switching center 8 controls call connection between mobile stations.

Next, call connection and disconnection of a group call between the originating mobile station 1, the terminating mobile station 2 and the terminating mobile station 3 will be described. When the control channel radio 4 receives the calling signal 9 sent from the originating mobile station 1 to the uplink control channel, the wireless base station 7 controls the calling information 1 by the control of the base station controller 6.
0 is sent to the exchange 8. The exchange 8 which has received the call information 10 sends the call channel allocation information 11 to the radio base station 7, and the radio base station 7 which has received the call channel allocation information 11 controls the call channel by the control of the base station controller 6. At the same time as transmitting the allocation signal 13 to the downlink control channel, the transmission of the communication channel radio 5 of the allocated communication channel is turned on, and the carrier and the communication monitoring signal 12 are transmitted to the downlink communication channel.

The transmitting mobile station 1, which has received the call channel assignment signal 13, switches the channel to the designated call channel, receives the carrier and the call monitoring signal 12 sent from the radio base station 7, and then moves to the up call channel. The carrier and call monitoring signal 14 is transmitted. The radio base station 7 receives the carrier and the call monitoring signal 14 and sends a call channel connection completion signal 15 to the exchange 8. Next, the exchange 8 sends the calling information 16 including the same information as the call channel assigned to the originating mobile station 1 to the wireless base station 7.

The radio base station 7 which has received the call information 16
Sends a bell ringing signal 17 to the originating mobile station 1 through the downlink communication channel and a paging signal 18 to the receiving mobile stations 2 and 3 through the downlink control channel. At the same time, the base station controller 6 starts the automatic response timer 19 and stops the monitoring of the carrier of the communication channel and the communication monitoring signal 14. If the originating mobile station 1 abandons the call at this point, the originating mobile station 1 sends a disconnection request signal 20 in the format shown in FIG. 2 to the uplink control channel. The wireless base station 7 receives the disconnection request signal 20,
The disconnection signal 21 is sent to the exchange 8.

The exchange 8 which has received the disconnection signal 21 sends a call channel open signal 22 to the radio base station 7, and the radio base station 7 which receives the call channel open signal 22 turns off the call channel radio 5, An end signal 23 is transmitted to the downlink communication channel to release the receiving mobile stations 2 and 3 to end the communication.

[0015]

As described above, according to the present invention, when a mobile station on the originating side abandons in the middle of a call connection for a group call, a disconnection request signal is transmitted from the abandoned mobile station on an upstream control channel. As a result, the midway abandonment of the calling mobile station can be detected even when the wireless base station is operating the automatic response timer, and there is an effect that the call can be terminated normally.

[Brief description of drawings]

FIG. 1 is a diagram showing a signal sequence for explaining an embodiment of the present invention.

FIG. 2 is a diagram showing a format of a disconnection request signal in FIG.

FIG. 3 is a diagram showing a signal sequence of call connection and disconnection in a conventional simplex group call.

[Explanation of symbols]

 1 Calling mobile station 2, 3 Calling mobile station 4 Control channel radio 5 Call channel radio 6 Base station controller 7 Radio base station 8 Switching station 9 Calling signal 10 Calling information 11 Calling channel assignment information 12 Downlink carrier and call Monitor signal 13 Call channel assignment signal 14 Uplink carrier and call monitor signal 15 Call channel connection completion signal 16 Call information 17 Bell ringing signal 18 Ring signal 19 Automatic response timer 20 Disconnect request signal 21 Disconnect signal 22 Call channel release signal 23 End signal

Claims (1)

[Claims] 1. A mobile station capable of simplex group calls, a radio base station for transmitting and receiving radio waves of the mobile station, a base station control device for controlling the radio base station, and the mobile station through the base station control device. In a mobile communication system composed of a station and a switching center that controls the connection with a general public line,
When a simplex group call between a plurality of mobile stations is started, the call is abandoned halfway after the mobile station on the calling side changes to the call channel and before receiving the call start signal transmitted from the radio base station. In this case, the originating mobile station sends a disconnection request signal to the radio base station through an uplink control channel.