JP2872114B2 - Communications system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer operation in a communication system in which a communication terminal is provided with a non-communication state monitoring timer in a communication system of a press talk system such as a local disaster prevention radio system.

[0002]

2. Description of the Related Art FIG. 1 is a diagram schematically showing the configuration of a local disaster prevention radio system, in which 1 is a fixed station,
The fixed station 1 incorporates a radio device 10 and a control device 11, and the control device 11 is connected to a plurality of handsets 3a to 3n constituting a communication terminal. Reference numeral 2 denotes a mobile station constituting a communication terminal. When the mobile station 2 is called a communication terminal, it is called one communication terminal, and the handsets 3a to 3n
Is referred to as the other communication terminal. Also, in FIG. 1, for simplicity of explanation, each of the fixed station 1 and the mobile station 2 is a single system, but generally, a plurality of each are connected to form a system.

[0003] Such a local disaster prevention radio system generally employs a press-talk system because of problems such as obtaining a radio qualification, and the mobile station 2 switches between transmission and reception by switching. Here, when performing individual communication from the mobile station 2 to the handset 3a, by designating the handset 3a, the control device 11 operates and a press-talk communication line is connected between the mobile station 2 and the handset 3a. Is done.

[0004] In addition, when the talker of the mobile station 2 wants to transfer to the handset 3b during the individual communication between the mobile station 2 and the handset 3a, ie, switch the communication line, the talker of the handset 3a is informed. When the caller operates the transfer button or the like of the handset 3a, the control device 11 operates to switch the line to the handset 3b.

[0005] In addition, communication terminals (for example, mobile stations 2) of this kind of regional disaster prevention radio system usually take into account that a communication line is occupied unnecessarily due to forgetting to switch off, simultaneous broadcasts in an emergency, and the like. A non-communication state monitoring timer is provided, and when a non-communication state (that is, when no voice is input for both transmission and reception) continues for a predetermined time (for example, 10 seconds), the non-communication state monitoring timer times out. Automatically cut off the communication line.

[0006]

As described above, in a conventional communication system of this type, a communication terminal is provided with a non-communication state monitoring timer, and when a non-communication state continues for a predetermined time, the line is cut off. When it is desired to transfer to another handset, the operation of the handset 3a, the transfer of a transfer destination, the handover, the transfer of a call, etc. are performed between each handset 3a, 3b and the control device 11. The operation is performed, but this transfer operation often takes 10 seconds or more from the transfer instruction to the end. During this time, nothing is transmitted from the fixed station 1, but the communication terminal (mobile station 2) needs to be in the reception mode until communication from the transfer destination is received. Therefore, during this transfer operation, the non-communication state monitoring timer times out and the connection line is cut off. When the transfer handset 3b is off-hook, the communication line is already cut off, and it is necessary to call again. There was a problem.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and it is possible to prevent a communication line from being interrupted at the time of transfer even when a non-communication state monitoring timer is provided.
It is an object of the present invention to provide a communication system capable of performing transfer while maintaining a communication line.

[0008]

SUMMARY OF THE INVENTION In a wireless communication system according to the present invention, wireless communication is performed between each communication station by a press-talk method, and at least one communication station terminal is provided with a non-communication state monitoring timer, and In a communication system in which a plurality of communication terminals are connected to a communication station and the communication terminal can be switched during the line connection, when the other communication terminal is switched during the line connection, the time until the switching of the communication terminal is completed. Is characterized in that the non-communication state monitoring timer does not interrupt the line.

In addition, wireless communication is performed between each communication station by the press-talk method. At least one communication station terminal is provided with a non-communication state monitoring timer, and the other communication station is connected to a plurality of communication terminals. In a communication system in which communication terminals can be switched during connection, if the other communication station switches communication terminals in response to an instruction from one communication station terminal during line connection, the other communication station switches until the communication terminal switching ends. The station periodically transmits a predetermined signal to one communication station terminal so that the non-communication state monitoring timer of the one communication station terminal does not time out.

The wireless communication system of the present invention having the above-described configuration can prevent inconveniences such as the communication line being already cut off when the transfer handset goes off-hook, and save the trouble of recalling again. It is possible to obtain a system that is easy to use and saves.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a local disaster prevention radio system described in the prior art, but the communication system of the present invention is basically the same as the conventional configuration except that the configuration of the radio device 10 and the operation of the control device 11 are different. The description of the configuration of the entire system is omitted.

Next, the operation will be described. FIG. 2 is a flowchart for explaining the operation of the present embodiment. In the figure, S1 to S10 indicate each processing step. FIG.
In the communication system shown in (1), a communication call is first made from the mobile station 2 to the handset 3a, and the handset 3a is off-hook to start a call. If the caller of the mobile station 2 decides to transfer this call line to the handset 3b during a call (step S1) and informs the caller who is talking on the handset 3a that the When the caller operates the handset 3a (Step S2), the control device 11 operates to notify the wireless device 10 of information indicating that the transfer is performed (Step S3).

The radio 10 includes a timer and a signal output means (not shown) for outputting a predetermined signal at the same level as the call level, in addition to the radio transmission / reception apparatus. The time (for example, 7 seconds) slightly shorter than the time (for example, 10 seconds) set in the communication state monitoring timer is set. When information indicating that the transfer is to be performed is received from the control device 11, the timer is set. Starts and starts counting (step S4).

The control unit 11 also controls the handset 3 of the transfer destination.
b, and monitors whether the handset 3b is off-hook (step S5). When the handset 3b is off-hook and the handset 3a is on-hook, it is considered that the transfer is completed (step S6), and the fact is notified to the wireless device 10 to notify the wireless device 10
Is stopped, and the wireless device 10 returns to the normal transmission / reception operation (step S7).

Before the transfer operation is completed, the radio 1
If the timer 0 has timed out (step S8),
The signal output means provided in the wireless device 10 operates to transmit a predetermined signal of the same level as the call level to the mobile station 2 (step S9), and restarts the timer of the wireless device 10 (step S10). Therefore, when the transfer operation is being performed, the mobile station 2 resets the non-communication state monitoring timer by receiving a predetermined signal equivalent to the call level before the non-communication state monitoring timer times out. An easy-to-use system that does not interrupt the existing line is obtained.

Although the above embodiment has been described using a regional disaster prevention radio system as an example, wireless communication is performed between communication stations by a press-talk method, and at least one of the communication station terminals is in a non-communication state. It goes without saying that the present invention can be implemented in all communication systems provided that a monitoring timer is provided, a plurality of communication terminals are connected to the other communication station, and communication terminals can be switched during line connection. Further, it goes without saying that press talk communication between fixed stations may be used instead of press talk communication between fixed stations and mobile stations. In addition, it goes without saying that the transfer can be similarly performed regardless of the transfer from any of the communication terminals (handsets) connected to the fixed station. Furthermore, in the above-described embodiment, before the non-communication state monitoring timer times out, a predetermined signal equivalent to the call level is received and the non-communication state monitoring timer is reset. A configuration may be adopted in which a signal for stopping the operation of the monitoring timer is transmitted, and the no-communication state monitoring timer is not operated during that time.

[0017]

As described above, in the communication system according to the present invention, when the other communication terminal is switched during line connection, the non-communication state monitoring timer switches the line until the switching of the communication terminal is completed. Since the configuration is not interrupted, it is possible to prevent the inconvenience that the line is interrupted during the transfer operation, and it is possible to obtain an easy-to-use system.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a regional disaster prevention radio system.

FIG. 2 is a flowchart for explaining the operation of the present embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed station 2 Mobile station (one communication terminal) 3a-3n Handset (other communication terminal) 10 Radio 11 Control device

Claims (1)

(57) [Claims] 1. A wireless communication is performed between each communication station by a press-talk method, a non-communication state monitoring timer is provided in at least one communication station terminal, and a plurality of communication terminals are connected to the other communication station. In a communication system in which communication terminals can be switched during connection, one of the communication station terminals receives an instruction from the other communication station during line connection.
When the communication station switches communication terminals, the communication terminal
Until the change is completed, the other communication station sets a predetermined signal.
By transmitting to one communication station terminal periodically,
Timeout of the non-communication status monitoring timer of the other communication station terminal
A communication system characterized in that the communication system is configured not to allow the communication.