KR20010063276A - Method for dividing voice and fax in WLL system - Google Patents

Abstract

PURPOSE: A method for automatically distinguishing a voice from a fax in a wireless local loop is provided to prevent a time out error due to a fax timer and to enable a user to use an analog fax in a WLL(Wireless Local Loop) system by a same manner used in a universal wire line. CONSTITUTION: Upon dialing of a terminal, a transmission-side fax regards a call as a voice call, connects to a receipt-side fax, and checks whether the fax corresponds to an automatic transmission mode. In the case of the automatic transmission mode, the receipt-side fax detects a fax tone of the transmission side and performs a fax call. Otherwise, the transmission-side fax detects the fax tone of the receipt side and changes a service option from the voice call to the fax call to perform the fax call.

Description

Method for automatic classification of voice and fax in wireless subscriber network system {Method for dividing voice and fax in WLL system}

The present invention relates to a method for automatically distinguishing between voice and fax in a wireless local loop (WLL) system. In particular, when a WLL system and an analog fax are serviced, the voice and fax modes are automatically divided into fax timers. The present invention relates to a method for automatically distinguishing between voice and fax in a wireless subscriber network system, which reduces error occurrence and makes it suitable for a user to use analog fax in a WLL system in the same manner as a general wired line.

In general, a WLL system using a code division multiple access (CDMA) wireless access standard can be divided into an N-CDMA (Narrowband-CDMA) (IS-95) method and a W-CDMA (Wideband-CDMA) method. Compared to the N-CDMA scheme, the W-CDMA scheme has a difference in frequency bandwidth, voice bandwidth data rate, and whether ISDN BRI (2B + D) service can be provided.

In addition, the wireless subscriber network system is a system that replaces a predetermined section between each subscriber's home and the public switched telephone by wireless instead of wires in the existing Public Switching Telephone Network (PSTN) system. Responsible for connection and disconnection of a bearer by a mobile terminal (MT) that receives a user's signal from a telephone (TE) in a home and transmits the signal to a base station, and the subscriber wireless access device (RIU) wirelessly. A base station controller (BS), a base station controller (BSC) that performs a function of connecting a call link between the switch and the base station, and an existing public line switching network (PSTN); It consists of a mobile subscriber line network switch (MSC) that is responsible for link establishment of a call.

Therefore, the wireless subscriber network can easily install the telephone network than the existing wired network system, the cost of facility expansion is low, and the flexibility of the network design according to the increase of subscribers has the advantage.

The W-CDMA wireless subscriber system also enables the implementation of integrated services digital network (ISDN) services and packet networks, as well as call, fax and data transmission, unlike conventional narrowband CDMA networks. .

According to the ongoing specification (IS-707-A.7) for analog fax service in the WLL system, when a user of an analog fax machine wants to send a fax, BS / MSC detects a fax tone (V.21 preamble) and negotiates service. Service Negotiation is the transition from voice to fax service options.

In this case, the method of determining whether a fax or voice is determined by the response of the reception side causes inconveniences of having to wait at the transmission side until receiving a ring from the reception side and responding.

1 is a flowchart illustrating a method of changing to a fax service option after a conventional voice connection.

As shown therein, when the terminal TE2 is dialed, attempting a voice connection to the BS / MSC (ST1 to ST4); Performing a telephone connection from the BS / MSC to a receiver (ST5 to ST8); When the terminal TE2 transmits a signal indicating that the fax is a fax, the receiving side transmits a signal indicating the fax to the terminal TE2 (ST9); Notifying that the fax is received, and transmitting and receiving the information of the receiving party and the specification of the receiving fax to the BS / MSC to enable the fax call (ST11 to ST15); The BS / MSC sets a protocol for transmitting or receiving data or fax on CDMA and then transmits the information of the receiving side and the specification of the received fax to the terminal (ST16 to ST29).

2 is a flowchart illustrating a conventional fax processing method.

As shown in the figure, when the terminal is dialed, it is set as a voice call and connected to the receiving side fax (ST31 to ST35); Detecting a fax tone generated at a receiving side and changing a connection of a wireless network from a voice call to a fax call (ST36 to ST39); Setting a CDMA fax protocol when the fax call is changed (ST40 to ST50); The step (ST51 to ST60) is performed to transmit information at the maximum transmission / receiving speed in the wireless section through the set fax call.

Referring to the operation of the conventional device in detail as follows.

Therefore, according to the analog G3 fax transmission protocol defined in IS-707-A.7, when sending / receiving faxes in the WLL system, first connect the voice call and then confirm that the fax tone (V.21 preamble) is detected and send the fax. Has a structure to switch service options.

As shown in Fig. 1, after dialing by a terminal, a BS / MSC detects a fax signal that is received after a counterpart's response is converted into a fax service option.

That is, when an off-hook is sent from a terminal equipment 2 (TE2) that is an analog fax machine to a mobile terminal 2 (MT2) that is a WLL terminal, the MT2 sends a dial tone to the TE2. TE2 then checks the dial tone and dials it by entering the telephone number in the DTMF (Dual Tone Multi Frequency) digit.

Then, the service option (S.O.) is divided into a voice call between the MT2 and the BS / MSC. Here, S.0. = Voice means voice call. In WLL system, voice call and modem use (fax or data communication) are distinguished due to the characteristics of the network, and each case is represented as S.O.

In BS / MSC, the originator calls to the PSTN (originate call to dialed number), and the PSTN sends a ring to the PSTN fax. When the receiving fax sends an off-hook to the PSTN, the PSTN announces that it is connected to the BS / MSC.

In addition, TE2 sends a CNG (Calling Tone), which indicates that the sender is a fax, to the receiving side FAX, and sends a CED (Called Station Identification), which is a signal indicating that the receiving side is a fax, to the TE2.

Accordingly, the voice call is changed from the voice call to the fax call state between the MT2 and the BS / MSC. That is, the service option between MT2 and BS / MSC is set to be a fax call. In this case, the receiving side fax transmits a V.21 preamble, a ready signal indicating that the signal is transmitted to the BS / MSC, and indicates the non-standard facility (NSF) signal representing the special function, not the standard function, and the information of the receiving side ( It transmits the Called Subscriber Identification (CSI) signal, which is the subscriber number, country, region, etc.) and the Digital Identification Signal (DIS) signal indicating the specifications of the standard fax.

Then, between MT2 and BS / MSC, a protocol for transmitting or receiving data or fax on CDMA is set (Synch TCP / IP-PPP-RLP). Here, AT + CFG is a command for distinguishing between sending and receiving.

The NSF, CSI, and DIS signals are transmitted from the receiving side fax to the BS / MSC, and the BS / MSC transmits the message at the maximum transmission rate.

On the other hand, in Figure 2, Voice Service Option Processing is to set the connection of the wireless network to the voice call to connect.

Thus, a DTMF digit is transmitted by sending an off-hook from TE2 to MT2, a dial tone from MT2 to TE2, and then entering a telephone number from TE2 to MT2, where the waiting time is 5 seconds after the last DTMF signal transmission. Here, Last DTMF wait time (5sec) means the start time of the actual call 5 seconds after the last DTMF digit input.

And the paging time for voice call setup is 5 ~ 10 seconds. Here, the paging time is the time until the terminal transmits the ring start signal to the other party after the call reaches the destination.

The PSTN sends a ring signal to the receiving fax machine, with the ring time being optional. This is the ring forwarding time until the PSTN fax is off-hook, and typically 2 to 4 rings are selected depending on the user's selection of the PSTN fax, which may take 6 to 20 seconds.

An example of time required is shown in Table 1 below.

CountOn / off time 1 time Episode 2 3rd time 4 times 2 sec On / 2 sec Off 2 sec 6 sec 10 sec 14 sec 2 sec On / 4 sec Off 2 sec 8 sec 14 sec 20 seconds

In general G3 fax, the ring counter is set more than 2 times or more than 4 times (in case of auto answering), and in case of ring on / off time, it is not possible to determine the general timing.

A CNG tone is sent from the TE2 to the receiving fax and a CED tone is sent from the receiving fax to the TE2, which takes 3 to 5 seconds to send and detect. This is the time until the system detects the fax tone after the PSTN fax is off-hook. If the CED tone is bypassed, the service option can be changed after detecting the CED tone signal (2.4 seconds to 4 seconds). Therefore, the time required to detect a signal after off-hook takes more than three seconds.

When the receiving fax sends a V.21 preamble to the BTS (or BS) / MSC, the service option changes from voice call to analog fax call between the BTS / MSC and MT2. The BTS / BSC is set to IWF (Interworking Function) and analog fax, so that the IWF sends a connection command to the BTS / BSC, and the BTS / BSC responds to the IWF.

PPP and TCP / IP are set between MT2 and IWF, and modem setting is performed.

The BTS / BSC and IWF establish a phone number, handle calls, and send and receive warning and connection signals and connection response signals.

The time it takes to set up the system is 8-12 seconds. This is the setup time inside the system for data call connection, which takes 8 ~ 12 seconds depending on the actual field measurement result (8 ~ 10 seconds for SK Telecom and 10 ~ 12 seconds for LG Telecom).

The receiver sends the V.21 preamble, NSF, CSI, and DIS signals to the IWF, and the BS / MSC sends the message to MT2 at the maximum baud rate. At this time, the transmission time of the fax tone is 2 to 2.5 seconds, and the paxton is transmitted twice so that the paxton is detected, and the interval when transmitting is 3 seconds. The total time taken is 7 to 8 seconds, which is the time required to detect a fax signal from the PSTN fax on the IWF modem after the data call system is set up as a data service option. In general, in the case of a sending fax modem, it is often impossible to receive a fax signal (CED, V.21 preamble, CSI, DIS) transmitted at the receiving end correctly.

The MT2 sends the V.21 preamble, CSI, and DIS signals to the TE2, which takes two to 2.5 seconds to send two Paxtons. That is, it is the time to generate and send a fax signal using the CSI and DIS values received from the system.

Therefore, the maximum waiting time after dialing outgoing faxes is 35.5 seconds, and the time for signal transmission to outgoing faxes when sending WLL faxes is 35 to 61.5 seconds.

However, since the conventional technology has to detect a signal generated at the receiving side in order to transmit a fax, it takes 35 to 60.5 seconds until the fax signal is actually connected. T1 of the fax standard (ITU-T.30) There was a problem that the probability of generating a fax error due to timeout became very high. In other words, when the user transmits a fax automatically when the user starts transmission immediately after dialing, there is a problem in that the probability of a fax error is very high.

Accordingly, the present invention has been proposed to solve the conventional problems as described above, and an object of the present invention is to automatically distinguish between voice and fax modes when a WLL system and an analog fax service are used, and thereby errors due to a fax timer. It aims to reduce the incidence and provide an automatic method for distinguishing voice and fax in a wireless subscriber network system that allows users to use analog fax in a WLL system in the same way as in a regular wire line.

In order to achieve the above object, the voice and fax automatic classification method of the wireless subscriber network system according to the present invention,

When dialing at the terminal, setting up a voice call to connect with a receiving fax machine and determining whether the fax is in an automatic transmission mode; If the fax is in an automatic transmission mode, detecting a fax tone of a sending terminal to perform a fax call; When the fax is in the manual transmission mode, the technical configuration is characterized by detecting the faxstone of the receiving side fax, changing a service option from a voice call to a fax call, and then performing a fax call.

1 is a flowchart illustrating a method of changing to a fax service option after a conventional voice connection;

2 is a flowchart showing a conventional fax processing method;

3 is a flowchart illustrating an automatic classification method of voice and fax in a wireless subscriber network system according to an embodiment of the present invention;

4 is a flowchart showing the method of FIG. 3 in detail.

Hereinafter, an embodiment according to the technical idea of the automatic classification method of voice and fax of the present invention wireless subscriber network system as described above are as follows.

3 is a flowchart illustrating a method for automatically distinguishing between voice and fax in a wireless subscriber network system according to an embodiment of the present invention.

As shown in the figure, when the terminal is dialed, it establishes a voice call to connect with the receiving side fax and determines whether the fax is in an automatic transmission mode (ST101 to ST103); If the fax is in an automatic transmission mode, detecting faxes of the transmitting terminal to perform a fax call (ST104) (ST105); If the fax is in the manual transmission mode, a fax stone of the receiving side fax is detected, the service option is changed from a voice call to a fax call, and then a fax call is performed (ST106) (ST107).

The operation of the automatic classification method of voice and fax in the wireless subscriber network system according to the present invention configured as described above will be described in detail with reference to the accompanying drawings.

First of all, the present invention relates to the conventional IS-707-A.7 in the case where an analog fax service defined in IS-707-A.7 is used to initially detect a fax tone in a voice call and switch to a fax transmission / reception service option. This is to solve the timing problem shown in.

Therefore, when switching to the fax transmission / reception mode, not only the conventional fax signal of the receiving side is detected, but also the fax signal (CNG) generated from the transmitting side is prevented to prevent a time out error, and the WLL Allows the system to automatically switch to fax mode when using analog fax.

The basic operation of the present invention is that when the WLL system attempts an analog fax transmission, as well as the method according to IS-707-A.7, as shown in FIG. This prevents a timeout error from occurring.

So, when dialing in an analog fax connected to TE2, call setup is first performed in the same way as voice connection.

If the fax is an automatic transmission, it immediately starts to send a fax tone (CNG) after dialing, at which time the TE2 detects the fax tone and starts the service option. This prevents timeout errors.

In addition, if the fax is a manual transmission, since the fax tone does not occur when the user is holding the handset after dialing, the receiving fax tone is detected first. In this case, the service option is changed by the receiving BS / MSC. You lose. Also, in this case, since the outgoing fax is started after being connected to the receiving end by the user, an error caused by the fax timer (T1 time) does not occur.

The operation of the present invention will be described in more detail with reference to FIG. 4 as follows.

That is, a DTMF digit is transmitted by sending an off-hook from TE2 to MT2, transmitting a dial tone from MT2 to TE2, and then entering a telephone number from TE2 to MT2, where the waiting time is 5 seconds after the last DTMF signal transmission. . Here, Last DTMF wait time (5sec) means the start time of the actual call 5 seconds after the last DTMF digit input.

Then perform setup of the system.

That is, in the automatic transmission mode, TE2 sends CNG tones to the receiving side fax. Set the service option to analog fax between MT2 and BTS / BSC, set the service option to analog fax from BTS / BSC to IWF, and send the ring signal to the receiving fax from the PSTN. The receiving fax sends a CED tone to the IWF and a V.21 preamble, a ready signal to indicate that the signal is being sent in front of the signal, the IWF sends a connection signal to the BTS / BSC, and the BTS / BSC to the IWF. Send a connection response signal.

Set up PPP and TCP / IP between MT2 and IWF and perform modem setup.

The BTS / BSC and IWF establish a phone number, handle calls, and send and receive warning and connection signals and connection response signals.

This system setup takes 8-12 seconds. Here, the system setup time is the setup time inside the system when data call is connected, and it takes 8 ~ 12 seconds depending on the actual field measurement result system (8 ~ 10 seconds for SK Telecom and 10 ~ 12 seconds for LG Telecom. )

It also detects fax tones twice.

That is, V.21 preamble and NSF, CSI and DIS signals are transmitted from the receiving fax machine to the IWF, and the BS / MSC transmits the message to the MT2 at the maximum transmission rate. At this time, the transmission time of the fax tone is 2 to 2.5 seconds, and the paxton is transmitted twice so that the paxton is detected, and the interval when transmitting is 3 seconds. The total time taken is 7 to 8 seconds, which is the time required to detect a fax signal from the PSTN fax on the IWF modem after the data call system is set up as a data service option. In general, in the case of a sending fax modem, it is often impossible to receive a fax signal (CED, V.21 preamble, CSI, DIS) transmitted at the receiving end correctly.

In addition, MT2 transmits V.21 preamble, CSI, and DIS signals to TE2, and it takes 2 ~ 2.5 seconds to send two Paxtons. That is, it is the time to generate and send a fax signal using the CSI and DIS values received from the system.

Therefore, the maximum waiting time after dialing outgoing fax is 35.5 seconds, and the time for signal transmission to outgoing fax is 19 ~ 22.5 seconds when sending WLL fax.

As described above, the present invention is to separate the voice and fax mode automatically when the WLL system and the analog fax service are connected, so that the user can use the analog fax in the WLL system in the same manner as in a general wired line.

Although the preferred embodiment of the present invention has been described above, the present invention may use various changes, modifications, and equivalents. It is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments. Accordingly, the above description does not limit the scope of the invention as defined by the limitations of the following claims.

As described above, the voice and fax automatic classification method of the wireless subscriber network system according to the present invention has the effect of reducing the occurrence of fax errors due to the fax timer problem in the initial connection step in the service of analog fax in the WLL system Will be.

Claims (1)

When dialing at the terminal, setting up a voice call to connect with a receiving fax machine and determining whether the fax is in an automatic transmission mode; If the fax is in an automatic transmission mode, detecting a fax tone of a sending terminal to perform a fax call; If the fax is in the manual transmission mode, detecting the faxstone of the receiving side fax, changing the service option from the voice call to the fax call, and then performing a fax call. Automatic classification method.