JPS61121544A - Radio channel setting system for mobile communication - Google Patents

Abstract

PURPOSE:To make good use of a radio channel and to attain the incoming of calls to an incoming no-charge subscriber by allocating the radio channel when a fixed period of time elapses before the answer signal, ring-back tone, etc. are not detected after a mobile station delivered a call. CONSTITUTION:When a subscriber of a mobile station 1 delivers a call, both calling and dial signals are transmitted from the station 1 and relayed to a radio base station 2, a radio circuit control station 3 and an exchange station 4 for mobile communication respectively. The station 4 performs connections to fixed network exchange stations 5 and 6 and a telephone 7 and at the same time sets the time T to a timer 19. When a mobile subscriber calls an incoming no-charge subscriber of the fixed network, a called subscriber gives an answer immediately in a short connection time. In such a case, no ring-back tone RBT is detected 18 and therefore a radio channel CH is set when the timer 19 counts the time T. When the called subscriber gives a slow answer, the RBT is detected. Then the answer of the called subscriber is detected by the break of the RBT, and the CH is set for talking. In case the RBT is not detected within the time T with a long connection time, the CH is set concurrently with the lapse of the time T.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] 1. The present invention relates to control in the case of allocating a line channel to a mobile station in mobile communication.

[Conventional technology]

FIG. 1 is a diagram showing an example of the configuration of a mobile communication system.

In FIG. 1, 1 is a mobile device, 2 is a radio base station, 3 is a radio network control station, 4 is a mobile communications switching center, 5 and 6 are respective fixed network switching offices, 7 is a fixed network telephone, and 8 is a fixed network telephone. 9 represents a wireless communication channel, and 9 represents a wireless control channel.

In the case of a call from a mobile subscriber, a calling signal and a dialing signal are sent from the mobile device 1 through the control channel 9, and are transmitted via the radio base station 2, the common control channel 11, the radio network control station 3, and the common control channel 13. , and relayed to the mobile communication switching center 4.

The mobile communication switching center 4 connects the fixed network switching centers 5 and 6 via the communication channel 14. The destination switching center 6 analyzes the status of the destination subscriber, and if the subscriber is busy, transmits a busy tone to the mobile communication switching center 41.

Furthermore, even if the outgoing line is blocked in the relay section up to the destination subscriber, this busy tone is sent to the mobile communication switching center 4 from the fixed switching center that detects the blockage.

As shown in FIG. 3, this busy tone is a 400 Hz audio frequency signal that is transmitted for 0.5 seconds and then interrupted for 0.5 seconds.

If the destination subscriber is free, the destination switching center 6 makes a call and sends a ringback tone to the mobile communication switching center 4, and when the subscriber responds, sends a response signal to the fixed switching center 5, 6.

This ringback tone is 400 as shown in Figure 2.
The Hz audio frequency is amplitude-modulated at 16 Hz and is transmitted for 1 second and cut off for 2 seconds.

Conventionally, a wireless channel for a telephone call is designated and set to a mobile device immediately after receiving a call signal from the mobile device.

Recently, in order to make effective use of radio channels in time, a control method has been proposed in which a radio channel for communication is not set when a calling signal is received, but a 141M channel is set when the called subscriber responds. ing.

FIG. 4 is a 7077 diagram of the mobile communication exchange 4 in this case, where 15 is a control circuit, 16 is a response signal detection circuit, and 1
7 represents a busy tone detection circuit, and 18 represents a ringback tone detection circuit.

The operation of the control circuit 15 is shown in a flowchart in FIG.

As shown in FIG.
Detect either ringback tone or response signal,
The setting of the mM channel is being determined.

[Problem that the invention seeks to solve]

In the conventional method described above, in which a wireless channel is set after the called party responds, in the case of an incoming call to a toll-free subscriber, a response signal is not returned to the originating switching center, so the mobile communications switching center does not respond (q The signal cannot be detected and the channel cannot be set.

Therefore, in the method of setting a wireless channel after the called party responds, there is a problem in that a mobile device cannot receive a call from a toll-free telephone.

The present invention takes advantage of the method of setting up a wireless channel after the called party responds, and provides an Mm channel setting method that allows connection from a mobile subscriber to a toll-free subscriber without reducing α. The purpose is

EMBODIMENT OF THE INVENTION Hereinafter, the structure etc. of this invention will be described in detail based on the drawing of an Example.

〔Example〕

FIG. 6 is a block diagram of a mobile communication switching center according to an embodiment of the present invention, in which 4' is a mobile communication switching center, 15' is a control circuit, 16 is a response signal detection circuit, 17 is a pinot tone detection circuit, 18 represents a ringback tone detection circuit, and 19 represents a timer.

The operation of the control circuit 15' in this figure is shown as a diagram in Figure tpJ7. Hereinafter, regarding this embodiment, the configuration diagram of the mobile communication system shown in Figures 6, 7, and 1 will be referred to. I explain while crying.

Note that the mobile communications switching center 4 in FIG. 1 may be replaced by a mobile communications switching center 4' (corresponding to 4' in FIG. ).

In FIG. 1, when a mobile subscriber makes a call, a calling signal and a dialing signal are sent from the mobile device 1 through a control channel 9. Line control station 3, common control channel 1
3 and then relayed to the mobile communications switching center 4'.

The mobile communication switching center 4' starts the timer 19 at the same time as performing outgoing connection processing to the fixed network. Based on the dial signal,
The call is routed within the fixed network to a switching center 5.6 and a telephone wall 7. The time T set for one timer is the time between the mobile communication switching center 4' and the telephone 1fi? Minimum time required within the fixed network to connect to the fixed network switching center 6 that accommodates (fixed network subscribers) 1
'. and T1, which is the allowable time to wait from the time the target responds until the conversation becomes possible.

For each of these actual times, To is about 5 seconds and T
, is about 3 to 5 seconds, and in this case T is 8 to 1
Set to 0 seconds.

When the mobile communication switching center 4' receives a response signal from the fixed network in the control circuit 15', detects the ring bank tone from the fixed network once at 8!18, and then detects ring bank tone disconnection. The common control channel 13
It instructs the radio network control station 3 to set up a radio communication channel via.

Based on this, the radio network control station 3 selects the empty P & rope channel, and instructs the mobile device 11 to switch to this communication channel via the common control channel 11, the radio base station 2, and the control channel 9. This will switch to call channel 8! It is connected to the call channel 14 via the lt#i base station 2, the call channel 10, the radio network control station 3, the call channel 12, and the mobile communication switching center 4', and starts a call.

Below, system operations will be summarized and explained separately for calls from a mobile subscriber to a fixed network toll-free subscriber and calls to subscribers other than the toll-free subscriber.

First, in the case of a call from a mobile subscriber to a fixed-line toll-free subscriber, if the connection time is short enough and the called party answers the call immediately after receiving the call, the ringback tone cannot be detected. When timer 19 counts time T, a wireless channel is set.

If the connection time is short enough and the called party's response is slow, the ringback tone is detected, and the called party's response is detected by the disconnection of the ringback tone, which establishes a wireless channel and starts the call. becomes possible.

If the connection time is long and the ringback tone cannot be detected within time T, the mobile subscriber will not be able to detect the ringback tone from the fixed network because the wireless channel will be set up when timer 19 measures time T. After listening, the call begins when the called party responds.

On the other hand, if the called party or the middle person is busy and a pinot tone is received within time T after the call is made, the mobile terminal notifies the user of the tone on the control channel. If a pinot tone is detected after time T, the call channel is set up once after the call is made, and then the pinot tone from the fixed network is sent to the mobile subscriber via the call channel 8. The termination will be at the discretion of the subscribers.

Alternatively, the once-set communication channel may be disconnected by sending a disconnection signal to the mobile unit 1 via the communication channel 8 at the time when the pinot tone is detected after the time interval T.

In the case of a call from a mobile subscriber to a Canadian subscriber other than a fixed-line toll-free call, if the called party answers within a time 'r after the call is made, the 5111 call channel is activated upon response detection. Set. If the called party responds later than this and a ringback tone is detected within time T, a wireless communication channel is established by receiving a response signal when the called party responds thereafter.

If the connection time is long and the ringback tone cannot be detected within time T, and if the called party or trunk line is busy, the case is the same as in the case of a call to a toll-free subscriber described above.

Although the above explanation assumes that the called party is a fixed network subscriber, the present invention can be similarly applied to a mobile subscriber.

〔Effect of the invention〕

As explained in detail above, according to the system of the present invention, a plurality of mobile stations share one or more wireless channels,
In a mobile communication system in which a radio channel is assigned to a mobile station for each call, there is an advantage that it is possible to effectively use the radio channel, and it is also possible to receive calls to subscribers who receive calls free of charge. .

[Brief explanation of drawings]

Fig. 1 is a diagram showing an example of the configuration of a mobile communication system, Fig. 2 is an explanatory diagram of a ringback tone, Fig. 3 is an explanatory diagram of a pinot tone, fJS4 is a block diagram of a conventional switching center for mobile communication, FIG. 5 is a flowchart showing the operation of a control circuit of a conventional mobile communication switching center, FIG. 6 is a block diagram of a mobile communication switching center according to an embodiment of the present invention, and FIG. 7 is a block diagram of a mobile communication switching center according to an embodiment of the present invention. 3 is a flowchart showing the operation of a control circuit of a mobile communication switching center. ] ...Mobile device, 2 ...Radio base station, 3 ...Wireless line control station, 4.4' ...
... Mobile communication switching center, 5.6 ... Switching center, 7 ... Telephone, 8 ... Radio communication channel, 9 ... Radio control channel ,
1m, 12.14 ・・・・・・Call channel,
11.13...Common control channel, 1
5.15” ...control circuit, 116 ...-
...Response signal detection circuit, 17 ...Bitone detection circuit, 18 ...Ringback tone detection circuit, 19 ...Timer agent Patent attorney Takashi Honma 7 Figure 2 Figure 31 Figure 4

Claims (1)

[Claims] In a mobile communication system in which multiple mobile stations share one or more wireless channels and allocate a wireless channel to each mobile station for each call, the mobile station detects a response signal from the called party after making a call, or Either a certain period of time has passed after the mobile station has made a call and no response signal, ringback tone, or busy tone has been detected from the called party, or a ringback tone has been detected after the mobile station has called, but within the same period of time as the above-mentioned period of time. 1. A wireless channel setting method in mobile communications, characterized in that a wireless channel is assigned based on an event that occurs earliest among the times when disconnection of the ringback tone is detected.