KR100331869B1 - Transmitting Speed Control Method When FAX Service is Provided by using WLL System - Google Patents

Abstract

The present invention relates to a transmission speed control method for a fax service using a wireless subscriber network system that can reduce transmission and reception errors in a fax service necessary for adjusting a transmission and reception speed of a fax connected to a WLL system. The present invention comprises the steps of transmitting signals for determining the transmission rate of data in the outgoing fax, and transmitting the signal to the wireless section of the subscriber network system by interpreting the signal in a wireless subscriber network (WLL) system, Receiving, by the terminal provided in the wireless subscriber network system, and transmitting the signal to a called party fax; determining whether the called party fax is a speed that can be received; and as a result of the determination, If it is not a speed that can be received, the called party fax is controlled to transmit a transmission rate determination failure signal for the received signal to the calling party fax to lower the set speed. Therefore, when an analog fax is connected to a WLL system and a fax service is provided, a more accurate transmission speed can be determined according to a state of a wireless section in which a subscriber access device and a base station are provided.

Description

Transmitting Speed Control Method When FAX Service is Provided by using WLL System}

The present invention relates to a fax connection to a wireless subscriber network system, and more particularly, to a transmission rate control method for a fax service using a wireless subscriber network system suitable for reducing transmission and reception errors during a fax service.

In general, a wireless local loop (WLL) system is for wirelessly providing a subscriber line provided between a subscriber and a telephone station. Such a system may connect and use a device for supporting a voice communication service, a facsimile transmission service, and a data communication service when necessary.

The WLL system combines radio frequency (RF) technology developed in the 1970s with semiconductor and wireless communication technology developed in the late 1980s, and solves problems such as frequency efficiency, wireless channel quality, and cost per subscriber. It began to be developed.

The advantage of the WLL system is that construction costs, time, and maintenance costs are reduced compared to the conventional wired network, and it is possible to provide various services such as excellent call quality, data, and ISDN. Therefore, it can be very useful for a new service provider who wants to secure a subscriber network early, or for a developing country in which wired network structure is poor.

The basic configuration of such a WLL system consists of a terminal and a subscriber station (Network Interface Unit: NIU) that enables wireless communication with the terminal during the exchange. In addition, the WLL system is divided into a separate WLL system and an integrated WLL system according to a connection relationship between a terminal and a subscriber access device. The separate WLL system is a wired connection between a fixed terminal and a subscriber access device so that a subscriber having a fixed terminal connected to a conventional wired network can purchase only a subscriber access device without purchasing a terminal when joining the WLL system. On the other hand, in the integrated WLL system, the terminal and the connection device are configured in hardware so that the subscriber who does not have a fixed terminal connected to the existing wired network can easily join the WLL system.

1 is a block diagram of a typical separate and integrated WLL system.

Referring to FIG. 1, a subscriber station 20 connected to a fixed terminal 10 or a fax 80 installed in a home or an office to transmit and receive information on a wireless interface, and a base station to which the subscriber station 20 is connected wirelessly. 40, a base station controller 50 which performs a wired connection with the base station 40 to perform call processing and message forwarding, and an operating device 60 which functions to operate and maintain the WLL system. Here, the switching center 70 is connected to the base station controller 50. Further, reference numeral 30 denotes an integrated terminal having a built-in subscriber access device.

Referring to FIG. 2, a fax service operation when a fax (FAX) is connected to the WLL system configured as described above will be described.

2 is a flowchart illustrating a fax service operation at a transmission speed allowed in a conventional wireless section.

First, the fax number of the destination fax 80 is inputted from the sender fax 90 shown in FIG. Then, the called party fax number output from the sending fax machine 90 is transmitted to the subscriber access device 20 through the WLL system (BS / MSC / IWF) through the common telephone network (PSTN). The subscriber access device 20 sets up a call to the called side fax 80 and then sets up a traffic path between the sending side fax 90 and the called side fax 80 so that data transmission / reception operations are normally performed.

Here, according to the ongoing standard (IS-707-A.7) for the analog fax service, as a method for adjusting the transmission speed of the analog fax, as shown in FIG. Signals that convey information from the side fax 90, for example, a signal that transmits the identification number of the fax (TSI), or the performance (speed, resolution) of the fax to be connected in the sending side fax 90 ) (Digital Commend Signal: DCS), Calling Station (2100Hz 2.6 ~ 4.0sec continuous) (Called Station Identification: CED), DIS Signal (Digital Transmit Command: DTC), caller's response to DIS signal (Digital Command Signal (DCS)), NSF (Non-Standard Facilities Setup: NSS), Train that fails to receive message Train Request signal indicating the need for speed adjustment (Failure To Train (FTT)), message that page transfer is complete (End-Of-Message: EOM), signal that receives another successive call and returns to C phase (Phase) Multi Page Signal (MPS) is delivered to the destination fax (80) connected to the WLL system.

Along with this, a signal for adjusting the speed at the destination fax 80, for example, a signal for transmitting predetermined data at a predetermined speed in the DCS for a predetermined time, and a training signal for determining whether actual transmission is possible at a set speed. Check: TCF is generated by the WLL terminal 10 itself and is transmitted to the receiving side fax 80 without being transmitted to the sending side fax 90.

It also displays the preamble signal (V.21 preamble) to inform the other party before sending the protocol signal, non-standard facility (NSF), and various information of the calling station (country, region Caller ID) (CalledSubscriber Identification, Option (CSI)), a signal indicating that the calling party is a standard fax machine (Digital Identification Signal (DIS)), and a Confirmed To Receive (CFR) for sending messages. It is delivered to the sending side fax 90.

That is, conventionally, by comparing the performance of the destination fax (80) and the sending fax (90) and transmits a predetermined signal promised at the speed that the sending fax (90) to transmit, the destination fax (80) is this Receive the signal to determine if the currently set speed can be transmitted without any problem between the connected line or wired network.

In this case, as shown in FIG. 2, the WLL system does not directly transmit the TCF signal, but the terminal 10 itself of the WLL system directly transmits the TCF of the corresponding speed to the destination side FAX 80 so that the protocol is not broken. (See a1, b1, c1 in FIG. 2).

However, when the TCF signal is not directly transmitted, an error of data generated between the actual wireless section or the line of the wired public telecommunication network (PSTN) is not directly transmitted. Therefore, there is a problem in that the desired speed cannot be determined in the actual transmission period in the FAX service. For example, if the 4800 bps TCF signal sent from the sender fax 90 in FIG. 2 causes a data error due to noise during the transmission on the actual line, the normal fax determines that the data is wrong and speeds the 2400 bps. Retransmission is required, but when a fax is connected to a WLL system to receive a fax service, the terminal 10 generates a new TCF signal so that an error is not transmitted and data is transmitted at 4800 bps. That is, as shown in FIG. 3, the speed of the sending side fax 90 is forcibly lowered in the system (here indicated by BS / MSC / IWF), and a blank line is transmitted to the receiving side fax 80. To compensate for the difference in speed (see a2-f2 in Figure 3).

In this case, since the transmission speed is determined irrespective of the line characteristics between the sending and receiving faxes, normal fax service cannot be achieved.

An object of the present invention has been made in view of the above-mentioned problems of the prior art, the transmission in the fax service using a wireless subscriber network system that can reduce the transmission and reception errors in the fax service required to control the transmission and reception speed of the fax connected to the WLL system It is to provide a speed control method.

According to an aspect of the present invention for achieving the above object, the transmission rate control method for a fax service using a wireless subscriber network system transmitting the signals for determining the transmission rate of data in the outgoing fax, and wireless Interpreting the signal in a subscriber network (WLL) system and transmitting the signal to a wireless section of the subscriber network system; receiving the signal by a terminal provided in the wireless subscriber network system and transmitting the signal to a called party's fax machine; The called party fax determines whether the currently set speed is a receivable speed, and if the determined speed is not a receivable speed, the called fax receives the transmission rate determination failure signal for the received signal. Controlling to lower the set speed by transmitting to a calling side fax.

1 is a block diagram of a typical separate and integrated WLL system.

2 is a flowchart illustrating a fax service operation at a transmission speed allowed in a conventional wireless section.

3 is a flowchart illustrating a fax service operation when a speed initially set in a conventional wireless section is not allowed.

4 is a flowchart for explaining a fax service operation according to the present invention;

Hereinafter, a configuration and an operation according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

First, a transmission side fax (PSTN FAX) 90 transmits a signal (TCF signal) for determining the transmission speed of data to a wireless subscriber network (WLL) system (BS / MSC / IWF). Then, the wireless subscriber network (WLL) system (BS / MSC / IWF) interprets the analog TCF signal and converts it into a digital form and transmits it to the wireless section of the subscriber network system (BS / MSC / IWF). Then, the terminal (MT2) 10 provided in the wireless subscriber network system (BS / MSC / IWF) receives the digital TCF signal, converts it into an analog signal, and delivers it to the called party fax (TE2) 80. do.

At this time, the TCF signal transmitted to the destination side fax (TE2) 80 provided in the wireless subscriber network system (BS / MSC / IWF) transfers the error due to the noise generated through the wired section or the wireless section. Therefore, the called party's fax machine (TE2) 80 may determine whether the currently set speed is a speed that can be received.

When the called party fax (TE2) 80 exceeds the range currently supported by the radio section, the WLL system (BS / MSC / IWF) transmits a transmission rate determination failure signal (as shown by 10 in FIG. 4). Failure Training: FTT) is transmitted to PSTN FAX (90) to lower the currently set speed, and transmission speed determination error signal (Error TCF) is sent to destination fax (TE2) (80) to maintain protocol. do.

Noise on the wired section between the PSTN FAX 90 and the WLL system (BS / MSC / IWF) or the wireless section between the WLL system (BS / MSC / IWF) and the terminal (MT2) 10. If an error occurs, the terminal MT2 10 transmits the FTT signal to the sender's fax machine TE2 90 as it is, as shown by 20 in FIG. The transmission speed is automatically adjusted.

At this time, if a time delay occurs in a procedure in which the terminal MT2 receives the FTT signal and transmits the FTT signal to the sender's fax (TE2) 90, it is transmitted from the receiver's fax (TE2) 80. Rather than transmitting the signal directly to the PSTN FAX 90, a delay signal REF of the transmission speed is received once more and then transmitted according to the protocol time so that a normal protocol can be performed. Thus, transmission is made at the most appropriate transmission / reception speed between the PSTN FAX 600 and the destination fax (TE2) 80.

According to the present invention as described above, when receiving the fax service by connecting an analog fax to the WLL system, there is an effect that can determine the more accurate transmission rate according to the state of the wireless section provided between the subscriber access unit and the base station. In addition, normal data transmission / reception can be performed by applying a compensation for noise between networks that may occur when the fax service according to the existing standard is executed.

Claims (5)

Transmitting signals for determining a transmission speed of data in the calling fax; Interpreting the signal in a wireless subscriber network (WLL) system and transmitting it to a wireless section of the subscriber network system; Receiving, by the terminal provided in the wireless subscriber network system, and transmitting the received signal to a called party's fax machine; Determining whether the called party fax is a speed that can be received; And if the current rate is not a receivable speed, controlling that the called party sends a transmission rate determination failure signal for the received signal to the calling party to lower the set speed. A transmission speed control method for a fax service, characterized in that. The method of claim 1, wherein when the terminal provided in the wireless subscriber network system receives the signal and transmits the signal to the called party's fax machine, the terminal transmits an error due to noise generated through the wired or wireless section. Transmission speed control method for fax service using wireless subscriber network system. The transmission rate in a fax service according to claim 1, wherein, in the controlling step, the wireless subscriber network system transmits a transmission rate error signal to the called party fax to maintain a protocol between the calling party and the receiving fax. Control method. Claim 4 has been deleted. The method of claim 1, wherein if a time delay occurs in the procedure of receiving and transmitting the signal to the called party's fax machine, the transmission speed is not directly transmitted to the sending party fax machine and the transmission speed is determined. A method of controlling a transmission speed in a fax service using a wireless subscriber network system, characterized in that a signal is received at least once and then transmitted according to a protocol time.