JPH0119663B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a billing method in a mobile communication system that charges charges based on receiving a billing signal.

Generally, in a mobile radio system where a telephone station intervenes, billing towards the mobile station during a call is carried out when the control station detects billing information in which the polarity of the DC voltage supplied to the telephone line is reversed every billing cycle. This is done by generating a low-frequency billing signal from the control station each time, transmitting this signal to the wireless section, and receiving this signal at the mobile station.

However, in mobile communication systems, depending on the conditions, the radio waves may be cut off, resulting in a time when the call is unavailable.Even in this case, if the radio wave is not cut off when the billing signal is sent, billing will be carried out, and the time when the call may be unavailable will be charged. It had the disadvantage of being charged a fee.

SUMMARY OF THE INVENTION An object of the present invention is to provide a billing method in a mobile communication system in which, when a call-disabled time occurs due to radio wave interruption, billing is not performed in the billing signal received after the call-disabled time.

In order to achieve such an objective, the present invention
A mobile station during a call receives pilot signals continuously, and when the pilot signal is not received for a certain period of time, the mobile station will not receive the charge collection signal even if it receives the next charge signal. does not occur. For this reason, the base station is equipped with a pilot signal generating means that sends out a pilot signal during a call, and the mobile station is equipped with a charging signal timer that sends out a first signal for a certain period of time when a charging signal is supplied, and a pilot signal is supplied to the mobile station. A pilot signal detection timer that sends out a second signal when the pilot signal is off, but turns off the second signal if the pilot signal is not supplied for a certain period of time, and a pilot signal detection timer that sends out a third signal when the second signal is off a storage circuit in which the third signal being sent is cut off at the trailing edge of the first signal; and a gate circuit that allows the first signal to pass when the third signal is not supplied. It is something that The present invention will be explained in detail below with reference to figures showing examples.

FIG. 1 is a block diagram showing one embodiment of the present invention, in which a public telephone TELp is connected to a mobile station TS mounted on a train TR. and the railway
Base stations ZN ₁ to ZN _o are arranged at appropriate intervals along the RW, and these base stations ZN ₁ to _{ZN o} are control stations.
It is now selected by MS exchange EX ₁ . In addition, the control station MS is provided with a trunk section TRK that connects the telephone line Lp and the exchange EX ₁ , and the telephone station PS is connected via this trunk section TRK.
A line with exchange EX ₂ is configured.

The telephone station PS exchange EX ₂ has subscriber telephone TEL ₁ .
- TEL _n is connected, and a billing control unit KCT is connected which inverts the polarity of the DC voltage supplied to the telephone line LP at time intervals corresponding to the communication distance and sends billing information Kd. The control station MS is equipped with a signal generator KRS that sends a billing signal fa to the wireless section every time it detects billing information sent via the telephone line LP. Note that among the base stations ZN ₁ to _{ZN o} , those in communication with the mobile station TS continue to send out the pilot signal _fPL at least during the call.

Figure 2 is a block diagram mainly consisting of the mobile station TS, in which the receiver RX is connected via the circulator CQ.
The received radio waves are demodulated and a demodulated output signal is supplied to the reception control unit RC. The reception control section RC sends out a pilot signal _fPL of the demodulated output signal to an output terminal a, and sends a billing signal fa to an output terminal b. TM ₁
is a pilot signal disconnection detection timer, and when a disconnection of the pilot signal _fPL is detected for a certain period of time or more, the DC output signal _fPLD is disconnected. TM ₂ is a billing signal detection timer, and when the billing signal fa is supplied, a DC output signal Ka is sent out for a certain period of time. MEM is a memory circuit and includes a pilot signal disconnection detection timer _TM1.
When the output signal f _PLD is disconnected, this is stored and an output signal is generated, and the storage is canceled at the trailing edge of the output signal Ka of the billing signal detection timer _TM2 . G is a gate circuit, and when no output signal is generated in the memory circuit MEM, the signal Ka from the billing signal detection timer is
The toll collection signal Kp is sent out by.

In the mobile communication system configured in this way, when the public telephone TELp on the mobile station TS side makes a call, the control station MS exchange EX ₁ and trunk section TRK are called via one of the base stations ZN ₁ to _{ZN o} . Since exchange connections are made, the public telephone TELp of the mobile station TS
A telephone line is established between the subscriber telephone and any of the subscriber telephones TEL ₁ to TEL _n on the telephone station PS side.

When entering the call state, the billing control section of the telephone station PS
In the KCT, the telephone line LP sends billing information for each unit call time, so the signal generator KRS of the control station MS sends out a billing signal fa of a low frequency, for example, 3650 Hz, every time it receives billing information. As a result, the base station transmitting radio waves not only sends out the pilot signal f _PL , but also
At the time of billing, a billing signal fa is also sent.

Radio waves transmitted from the base station ZN are received by the receiver RX of the mobile station TS, demodulated, and converted into a pilot signal.
_fPL is supplied to the pilot signal disconnection detection timer _TM1 from the output terminal a of the reception control section RC. The pilot signal disconnection detection timer _TM1 does not disconnect the output signal _fPLD as long as the pilot signal _fPL is supplied.
The memory circuit MEM also does not generate any output.

At this time, when the receiver RX demodulates the charging signal fa, the reception control unit RC sends the charging signal fa to the charging signal detection timer TM ₂ from the output terminal b, so that the charging signal detection timer TM ₂ outputs the signal for a certain period of time. Ka
is supplied to the gate circuit G. Then, since the pilot signal f _PL is continuously received and the memory circuit MEM is not generating an output, the billing signal detection timer is activated.
The gate circuit G to which the output signal of TM ₂ is supplied is:
Sends the toll collection signal Kp to the public telephone TELp,
Billing is done.

On the other hand, when the radio waves are interrupted and the pilot signal _fPL is not received for a certain period of time or more, the output of the pilot signal disconnection detection timer _TM1 changes, so that the memory circuit MEM also generates an output. After this, when the radio wave interruption is restored and the billing signal fa is received, the output signal Ka of the billing signal detection timer TM ₂ is supplied to the gate circuit G, but at this time, the memory circuit MEM generates an output signal. Therefore, the toll collection signal Kp is not sent to the public telephone TELp. Then, when the output signal from billing signal detection timer TM ₂ ends,
That is, at the trailing edge of the output signal Ka, the memory circuit MEM is released from memory and no longer generates an output signal. Therefore, for billing signals received after the memory in the memory circuit MEM is cleared, public telephones
A charge collection signal Kp is sent to TELp.

FIGS. 3 and 4 are timing charts showing the state of signal exchange. FIG. 3 shows a case where there is no interruption in radio waves, and FIG. 4 shows a case where there is an interruption in radio waves.

In FIG. 3, A to C represent signals at the control station MS, and N to H represent signals at the mobile station TS. A is the base station
The state where the pilot signal _fPL is being sent from ZN is shown, and the state where the mobile station TS receives the pilot signal _fPL and the pilot signal disconnection detection timer _TM1 continues to send out the output signal _fPLD is shown. It shows. C is a state in which the charge signal fa is sent from the control station MS based on the charge information LO supplied to the control station MS via the telephone line Lp (actually, the polarity of the DC voltage supplied to the telephone line Lp is reversed). It shows. In E, the mobile station TS receives the charging signal fa, and the charging signal detection timer TM ₂ sends out an output signal Ka, and in H, the toll collection signal Kp is sent to the public telephone TELp by this output signal Ka. It shows the state of being.

FIG. 4 shows a case where there is an interruption in radio waves, and each signal is the same as in FIG. 3. When the pilot signal _fPL is interrupted for a period _T1 in C of the same figure, the output signal of the pilot signal disconnection detection timer _TM1 of the mobile station TS changes as shown in D. Therefore, since the memory circuit MEM generates an output signal, the gate circuit G does not generate the charge collection signal Kp even if the charge signal detection timer TM ₂ generates the output signal Ka.
No charges will be made at this time. However, the memory circuit
Since the MEM is reset at time _t1 at the trailing edge of the output signal of the billing signal detection timer _TM2 , from the next time onwards, the billing signal fa will be used to generate the billing signal.
Generate Kp and charge. Also, a period shorter than the predetermined period that occurs at time t ₂ as shown in Figure 4 C
When the pilot signal is not received by T ₂ ,
Since the pilot signal disconnection detection timer _TM1 does not generate any state change in the output signal as shown in (d), the toll collection signal Kp is normally sent out at time _t3 as shown in (f), and charging is performed.

As explained above, in the billing method in the mobile communication system according to the present invention, a mobile station during a call always receives a pilot signal, and when this pilot signal is not received for a certain period of time, the mobile station receives the next call. Since the system does not charge even if a charging signal transmitted to the terminal is received, charging is not performed when a call failure time occurs, which has an excellent effect of not causing any disadvantage to the user.

[Brief explanation of drawings]

FIGS. 1 and 2 are block diagrams showing one embodiment of the present invention, and FIGS. 3 and 4 are timing charts showing signal transmission and reception. TS...Mobile station, TELp...Public telephone, ZN ₁
~ZN _o ...Base station, EX ₁ , EX ₂ ...Exchange,
TRK...Trunk, KSR...Signal generator, MS
...control station, Lp...telephone line, PS...telephone station,
KCT...Charging control unit, TEL ₁ to TEL _n ...Subscriber telephone, fa...Charging signal, f _PL ...Pilot signal,
Kp...Toll collection signal.

Claims (1)

[Scope of Claims] 1. In a charging method in a mobile communication system in which a mobile station during a call generates a charge collection signal by receiving a charge signal transmitted via a base station, a pilot signal is emitted during a call. a base station equipped with a pilot signal generating means for transmitting a pilot signal; a charging signal timer that transmits a first signal for a certain period of time when a charging signal is supplied; and a charging signal timer that transmits a second signal when a pilot signal is supplied. A pilot signal detection timer that outputs a second signal when the pilot signal is not supplied for a certain period of time; and a pilot signal detection timer that transmits a third signal when the second signal is disconnected; A mobile communication system comprising a mobile station having a memory circuit whose signal is cut off at the trailing edge of the first signal, and a gate circuit which allows the first signal to pass when the third signal is not supplied. Billing method.