JPS59216346A - Call reserving system - Google Patents

Abstract

PURPOSE:To make efficient packet communication possible by reserving a call from a terminal. CONSTITUTION:A terminal 1 transmits a call reserving signal to a communicating circuit 2 at the time when the terminal 1 wants to call. When a signal detecting circuit 300 in an exchange 3 receives and detects this call reserving signal, a packet processing part 31 is instructed through an indication line 311 to set the terminal 1 to the call reservation state. Since the packet processing part 31 inhibits incoming calls from the other terminals to the terminal hereafter by this instruction, the processing of call from the terminal 1 is not hindered. That is, when the terminal 1 inputs a call command, the packet processing part 31 analyzes this call command received through the communication line 2 and the signal detecting circuit 300 and controls the connection of the terminal 1 to a desired other-party terminal 5 through a communication line 4 and controls the packet transfer between both terminals 1 and 5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a call reservation system, and particularly to a call reservation system in a packet switching network.

Conventionally, when a subscriber terminal accommodated in a packet-switched network makes a call, it inputs a calling abbreviation, a communication partner terminal number, and, if necessary, a facility designation such as a call termination charge request, using a calling command. However, since the calling command itself inputs divine parameters, it takes a long time to complete the input, so it often happens that the calling terminal receives an incoming call from another terminal while inputting. on the other hand,
When the switching center receives the final code of the calling command from the calling terminal, it recognizes it as a calling command and performs the necessary processing, so the switching center recognizes the calling command as the calling command after the terminal generates the intention to call. The time it takes to recognize it also takes longer. Therefore, in the above case, the terminal's intention to make a call is ignored, and there is a drawback that it is desirable to be able to make a call while there is an incoming call.

An object of the present invention is to define a special call reservation signal to shorten the time difference between the time when the terminal generates the intention to make a call and the time when the switching center recognizes the calling command, and the switching center When a reservation signal is received, the terminal is placed in a call reservation state, and while this reservation state continues, incoming calls from other terminals to the call reservation terminal are prohibited, thereby eliminating the above disadvantages and achieving efficient packet communication. An object of the present invention is to provide a call reservation method that enables the following.

The call reservation method according to the present invention is a packet switching network in which packet communication is performed between a plurality of subscriber terminals via a switching center, in which a specific call reservation signal transmitted by the subscriber terminal prior to a call command is sent to the The present invention is characterized in that it includes call reservation means for prohibiting incoming calls from other subscriber terminals to the subscriber terminal when the call is received at the exchange. Further, the call reservation means includes a reservation signal detection circuit that receives and detects a specific call reservation signal from the subscriber terminal, and a timer circuit that is set when the call reservation signal is detected. The present invention is characterized in that when the reservation signal detection circuit detects the call reservation signal, the reservation signal detection circuit instructs the packet processing unit to enter the call reservation state, and when the timer times out, instructs the packet processing unit to cancel the call reservation state.

Next, the present invention will be explained with reference to the drawings.

The figure is a block diagram showing an embodiment of the call reservation system of the present invention. In the figure, the packet switching network includes a terminal for both sending and receiving calls (hereinafter simply referred to as a terminal) 1 and a terminal 1 via a communication line 2.
A packet switching center (hereinafter simply referred to as a switching center) 3 connected to
Another terminal 5 connected to the exchange 3 via the communication list 4
It consists of The exchange 3 includes a call reservation device 30 interposed between the communication lines 2 and 4, and a packet processing unit 31 that performs call control and packet transfer control between the accommodated terminals including the terminals 1 and 5, and includes, for example, Packets being transferred between the terminals 1 and 5 are sent to the communication line 22 by the calling reservation means 0. It is transmitted and received via the packet processing unit 31 and the communication line 4. Note that special signals (for example, specific characters that are different from each other) are defined in advance between the terminal 1 and the call reservation device 30 as a call reservation signal and a call reservation cancellation signal. The call reservation device 30 is connected to the communication line 2 and detects the signal through a signal detection circuit 300 that receives and detects the call reservation signal and the call reservation cancellation signal from the terminal 1, and a timer setting line 310. A timer circuit 301 that starts timing at a predetermined time according to instructions received from the circuit circle.
The signal detection circuit 300. Timer circuit 3
01 issues a call reservation status instruction 2 to the packet processing unit 31 via instruction lines 311 and 312, respectively, to cancel the call reservation status.

Next, the operation of this embodiment will be explained.

When the terminal 1 wants to make a call, it transmits the call reservation signal to the communication line 2. At the exchange 3, a signal detection circuit 30
0 receives and detects the call reservation signal, the instruction line 311
It instructs the packet processing unit 31 to change the state of the terminal to a call reservation state via the terminal. In response to this instruction, the packet processing unit 31 prohibits the terminal 1 from receiving calls from other terminals from this point forward using a generally known method.
There will be no hindrance to call processing from. That is, when the terminal l inputs a calling command, the #distribution packet processing unit 31 connects the communication line 2. The calling command received via the signal detection circuit 300 is analyzed, and the connection to the desired partner terminal 5 is controlled via the communication line 4.
Performs packet transfer control between Note that the time circuit 301 starts timing according to an instruction from the signal detection circuit 300 at the time when the call reservation signal is received and detected, and when a preset time has elapsed (timeout), the time circuit 301 starts timing via the instruction line 312. The packet processing section 31
Since the instruction to cancel the call reservation state is given to the packet processing unit 3
1 cancels the incoming call prohibition state to the terminal 1. Therefore, even if the terminal 1 makes a call reservation but does not make a call, the state in which incoming calls to the terminal 1 are prohibited will not continue forever. Further, when the terminal 1 wants to cancel the call reservation before the timeout, when the signal detection circuit 300 receives and detects the call reservation cancellation signal from the nuclear terminal 1, the packet is sent via the instruction line 311. Processing section 31
Since the packet processing unit 31 issues an instruction to cancel the incoming call prohibition state, the packet processing unit 31 similarly releases the incoming call prohibition state to the terminal 1.

It should be noted that all the constituent elements of the call reservation device 30 can be easily realized using conventional techniques.

As is clear from the above questions, according to the call reservation method of the present invention, if the call reservation is made from the terminal, the call will not be blocked even during times when there is a lot of communication traffic. This has the effect of realizing efficient packet communication.

[Brief explanation of drawings]

The figure is a block diagram showing an embodiment of the call reservation system of the present invention.

Claims (1)

[Claims] (1) In a packet-switched network that performs communication between a plurality of subscriber terminals via a switching center, a call reservation method is characterized in that the subscriber terminal includes a specification transmitted prior to a call command. (2. In the call reservation method described in claim (1), the call reservation means includes a reservation signal detection circuit that receives and detects a specific call reservation signal from the subscriber terminal, and a timer circuit that is set when a reservation signal is detected; A call reservation method characterized in that when a timeout occurs, an instruction is given to cancel the call reservation state.