KR100365734B1 - Method for transmission dial tone in Wireless Local Loop terminal - Google Patents

Abstract

The present invention relates to a method for transmitting a dial tone in a wireless subscriber network terminal, which is used in a WLL terminal using a CDMA network, so that a user who is familiar with wired lines can use it more conveniently. When a terminal receives a dial tone and a keypad is pressed by a user, a DTMF is generated, the modem detects the DTMF, converts it into a "Send DTMF message", and transfers it directly to the exchange via the base station, thereby controlling at the exchange. All the functions can be applied to the WLL terminal as it is, and thus, there is no need to implement a separate function in the terminal, thereby reducing the load on the terminal and changing the hardware (H / W) in the existing general WLL terminal. Software can be implemented without any software (S / W), and regular wired switch can be used as it is. It relates to much the same way as dial tone transmitted from the wireless subscriber network terminal to control the WLL terminal method as controlling.

Description

Method for transmission dial tone in wireless subscriber network terminal {Method for transmission dial tone in Wireless Local Loop terminal}

The present invention relates to a dial tone transmission method in a wireless subscriber network terminal, in particular, when a terminal receives a dial tone generated in an exchange, and a keypad (Key PAD) is pressed, a DTMF is generated and a modem detects the DTMF and sends the message "Send DTMF. By converting the message into "message" and transmitting it directly to the exchange, all functions controlled by the exchange can be applied to the WLL terminal as it is, so that the terminal does not need to implement a separate function so that the load time of the terminal can be reduced. The present invention relates to a dial tone transmission method in a wireless subscriber network terminal.

In general, a wireless local loop (hereinafter referred to as a "WLL") is a technology for providing a subscriber line wirelessly, unlike a conventional wired subscriber network connecting an exchange and an individual subscriber through a wired subscriber line. As RF technology developed in the 1970s and semiconductor and wireless communication technologies developed in the late 1980s, the previous problems such as frequency efficiency, wireless channel quality, and cost per subscriber were solved. In addition, WLL is easier to construct a subscriber line than existing wired subscriber networks, and can be used as an emergency subscriber line in preparation for natural disasters, and can provide various services such as POTS, data, and ISDN.

Due to the above advantages, the WLL has been spotlighted as a communication infrastructure of developing countries where new subscribers can secure a subscriber network early and establish new subscribers quickly in urban areas, and especially where wired communication network structure is weak. Products developed for WLL include satellite system, fixed microwave system, cellular technology system, and cordless system system. It is used.

The wireless subscriber network (WLL) system is composed of a subscriber access device, a terminal located in a subscriber's home, a base station for converting a wireless signal received from the detachable terminal into a wired signal, and a switch for connecting a transmitting side to a receiving side. The terminal of the wireless subscriber network system is connected to a general telephone, a facsimile, or a personal computer that is an external device through a port.

The wireless subscriber network system can be classified into a narrowband wireless subscriber network system (Narrowband WLL) and a wideband wireless subscriber network system (Wideband WLL), both of which use a CDMA scheme. In particular, the narrowband wireless subscriber network system has only mobility in systems applied to mobile communication technology since the mid-1990s due to the rapid decline in mobile communication technology and the falling prices of systems and terminals and increasing telephone demand in developing countries with low telephone penetration rates. Except for Bay, it was developed as a "Fixed Subscriber" and was developed to serve developing countries.

In addition, the narrowband wireless subscriber network system mainly processes voice, can process low-speed data, fax, etc., and in the case of voice, it is possible to provide the same level of service as the existing wired quality, and is fixed than conventional mobile communication. As the number of subscribers is accommodated, the capacity of subscribers is also increasing.

The analog voice data input from the terminal of the narrowband wireless subscriber network system through the general telephone is converted into digital voice data by the codec through the line port and the SLIC, and controlled by the mobile station modem (MSM). The voice data is transmitted to the base station via the RF unit. On the contrary, the voice data received through the antenna is transmitted to the general telephone of the subscriber via the RF unit, the MSM unit, the codec, and the slick.

In addition, the terminal of the narrowband wireless subscriber network system includes a memory and stores a plurality of outgoing telephone numbers.

In the conventional WLL terminal as described above, when a user picks up a handset (handset) and makes a dial tone by itself, the user dials a telephone number to a system (base station) by pressing a key button. .

However, since the user of the WLL terminal is more accustomed to the landline, there is a situation in which the user wants a method similar to that of a general landline phone in dialing. A lot of effort is being put into grafting.

Accordingly, the present invention is proposed to solve the above problems of the prior art,

It is an object of the present invention to generate a DTMF when a terminal receives a dial tone generated at an exchange and press a key PAD by a user, detect a DTMF in a modem, convert it into a "Send DTMF message", and then pass it through a base station. By directly transmitting to the exchange, all functions controlled by the exchange can be applied to the WLL terminal as it is, and thus, there is no need to implement a separate function in the terminal, thereby reducing the load time of the terminal. The present invention provides a dial tone transmission method in a wireless subscriber network terminal that can be implemented by software (S / W) without changing (H / W).

The present invention for achieving the above object,

Setting an timer when the off-hook occurs in the standby state, checking whether the timer has expired, and

When the timer expires, transitioning to a system access state and calling without a telephone number and checking whether a Receive Service Connect Message is received in a traffic state;

Key scan when the check result message is received, and if the check result message is not received, returning to the access state and uploading a system origination message back to the system; ,

When the key is received, a Send DTMF Message corresponding to the key value is transmitted to the system, and in the system receiving the message, the message is interpreted, converted into analog, and sent to the exchange by wire. Bypassing it,

Receiving, by the exchange, a procedure according to a numbering plan by receiving the message, and ringing a ringing tone to a terminal;

Checking, by the terminal, whether or not a ring tone is generated from the exchange; if a ring tone is not received, performing a new key search; and when a check tone is received as a result of the check, forming a call path and conversing;

The method is characterized in that the terminal is configured to check whether a Receive Release Order is received according to an on hook of a sender or a receiver and return to an initial stage when a command is received. .

1 is a block diagram showing a block configuration of a wireless subscriber network system according to the present invention,

2 is a flowchart illustrating an interface process between a terminal and a system according to the present invention;

3 is a flowchart illustrating an interface process between a terminal and a system according to the present invention.

4 is a flowchart illustrating a dial tone transmission method through a traffic channel in a WLL terminal according to the present invention.

<Explanation of symbols for the main parts of the drawings>

100 ..... WLL Terminal (Wireless Local Loop Terminal)

110 ..... Key PAD

120 ..... Mobile station modem (MSM)

200 ..... System (Systm, Base Station)

300 ..... Exchange (MSC)

Hereinafter, a preferred embodiment of the "dial tone transmission method in a wireless subscriber network terminal" of the present invention according to the above technical concept will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing a block configuration of a wireless subscriber network system according to the present invention.

As shown here, the WLL terminal 100 located in the subscriber's home and wirelessly connected to the base station 200 of the wireless subscriber network system, and receives the wireless signal of the WLL terminal 100 to establish a forward and reverse link. And a base station 200 for converting a wireless signal received from the terminal 100 into a wired signal, and performing a switching function of connecting a transmitting side of a wireless subscriber network system connected to the base station 200 with a receiving side. It consists of an exchange (MSC) 300.

In addition, the WLL terminal 100 receives a telephone number number of a predetermined digit from the sender and dials a DTMF (Dual Tone Multi Frequency), which combines tones of two voice frequencies. Including a keypad 110 generated, and a mobile station modem (MSM) for detecting the DTMF signal generated by the keypad 110, converts it into a transmission DTMF message and transmits it to the switch 300 through the base station 200; It is composed.

Referring to the operation of the system according to the present invention having such a configuration as follows.

When a user lifts the handset of the WLL terminal 100 to make a call, an Off Hook Key is generated. The signal is detected by the mobile station modem 120 to set a timer. and when the timer expires, the mobile station modem 120 transitions to a system access state and originates without a telephone number.

The system 200 receiving the outgoing message transmits a service connection request message to the switch 300, where the system 200 and the switch 300 set up a call according to the TIA / EIA IS-634A standard. Set the call.

When the call setup is completed, the exchange 300 transmits an allocation request message to the system 200, and the system 200 transmits a channel request message to the terminal 100. At this time, call setup processing between the terminal 100 and the system 200 according to international air interface (interface protocol of wireless communication) standards such as TIA / EIA IS-95A and TIA / EIA IS-95B is performed. Done.

When the call setup ends, the system 200 sends a service connection message. When the message is received, the terminal 100 performs a key scan.

When the terminal receives the key, it transmits a transmission DTMF message corresponding to the key value to the system 200, and the system 200 interprets the message and converts the message into an analog, which is sent to the exchange 300 by wire. Pass it by.

The exchange 300 receives this and corresponds to a protocol (language and grammar) between the user and the communication network required for accessing and controlling a numbering plan (telecommunications network). And the ring back tone to the terminal 100.

When the receiver receives the receiver, a call path is formed, and the terminal 100 receives or releases a release order according to an on hook of the transmitter or the receiver.

2 is a flowchart illustrating an interface process between a terminal and a system according to the present invention, and FIG. 3 is a flowchart illustrating an interface process between a terminal and a system and an exchange period according to the present invention.

First, in a conventional wireless terminal or a conventional WLL terminal, a dial tone heard by a user by picking up a handset is a signal generated by the terminal itself, whereas as shown in FIG. 2, the present invention first accesses the system. You will be dialed in and you will hear the dial tone made by the switch as you would a regular telephone. Therefore, since all functions controlled by the exchange (such as a beep coming from the handset when the user holds the handset for a long time) can be applied to the WLL terminal as it is, the terminal does not need to implement these functions separately. Much less.

This will be described in detail with reference to FIG. 3.

As shown in Fig. 3, an Off Hook Key is generated when a user picks up the handset to make a call. Once the off-hook key is detected, a timer is set between 0.005 ms and 0.001 ms and waits for the timer to expire. When the timer expires, the terminal 100 transitions to a system access state and attempts to originate without a telephone number.

Next, the system 200 that receives the origination message transmits a CM service request message to the exchange 300. At this time, the system 200 and the exchange 300 set up a call according to the TIA / EIA IS-634A standard. Once the call setup is completed, an assignment request message is finally sent from the exchange 300. ) Is transmitted to the system 200, and the system 200 transmits a channel assignment message to the terminal 100. At this time, call setup processing is performed between the terminal 100 and the system 200 according to international air interface standards such as TIA / EIA IS-95A and TIA / EIA IS-95B. Done.

In the normal case, the call setup process ends in 1 to 2 seconds, and when the call setup ends, the system 200 sends a service connect message, and the terminal 100 waits for this message. When the message is received, a key scan is performed, and if not, a key scan is performed, and when the message is not received, the message is returned to the access state and the system origination message is sent back to the system 200.

On the other hand, when the terminal 100 receives a key, a Send DTMF message corresponding to the key value is uploaded to the system 200, and the system 200 interprets the message and converts the message into an analog. This bypasses the switch 300 by wire. The exchange 300 receives this, performs a procedure according to a numbering plan, and gives a ring back tone to the terminal 100.

The receiver 100 receives a handset and a call path is formed. The terminal 100 receives or releases a release order according to an on hook of a transmitter or a receiver.

On the other hand, there are a few things to note in the present invention, firstly the user should set up (call) as soon as possible pick up the handset. To this end, the terminal not the service option negotiation (service option nego) procedure. This is because when the terminal sends an origination message, the service option supported by the system is set in a menu and stored in nonvolatile memory (NV). You can omit the option nego procedure, which allows you to receive a dial tone from the exchange in one to two seconds.

Secondly, if the user lifts the handset and presses the key at the call setup time before the dial tone comes down from the system, the key value may be missed. In order to prevent this, the present invention used a key buffering technique in the call setup period.

Whenever the user picks up the handset and presses the handset, the key value is unconditionally stored in a random address in the SRAM. When a service connect message comes down from the system, the SRAM designated as the buffering address is searched for the key value. If present, the values are sequentially loaded into the system and the key buffering algorithm is exited.

4 is a flowchart illustrating a dial tone transmission method through a traffic channel in a WLL terminal according to the present invention.

As shown in FIG. 11, it is checked whether an off hook has been generated as in step ST12 in the terminal standby state as in step ST11. When the off hook occurs as a result of the check, in step ST13, between 0.005 ms and 0.001 ms A timer is set, and in step ST14, it is checked whether the timer expires.

When the timer expires, in step ST15, the terminal transitions to a system access state and attempts to originate (No Digit), and in step ST16, the originated service connection is established in a traffic state. Check whether the message is received (Receive Service Connect Message), if the message is received in step ST17 (Key Scan), if the check result message is not received, return to the access state (Access State) again to send the system Post a System Origination Message back to the system.

Next, when a key is received in step ST17, a send DTMF message corresponding to the key value is transmitted to the system in step ST18, and in step ST19, the system that receives the message interprets the message to analog Convert it to analog and bypass the exchange by wire.

Next, the exchange receives the message and performs a procedure according to a numbering plan as in step ST20, and gives a ringing tone to the terminal.

Next, the terminal checks whether or not a call tone generated from the exchange is received as in step ST21. If there is no call tone reception, the terminal moves to step ST17 to renew the key search, and when the check result is received (at the receiving side) In the step ST22, a telephone path is formed to converse.

Next, in step ST23, the terminal checks whether or not a Receive Release Order is received according to an on hook of the transmitting side or the receiving side. If no command is received, the terminal continues to perform the call in step ST22. If received, return to the initial stage.

According to the present invention described above, the method for transmitting a dial tone in a wireless subscriber network terminal, after the terminal receives a dial tone, the terminal detects the DTMF, converts it into a "Send DTMF message", and transmits it to the base station. In this case, since the signal is directly transmitted to the exchange, all the functions controlled by the exchange can be applied to the WLL terminal as it is, and thus, there is no need to implement these functions in the terminal, thereby reducing the load on the terminal.

In addition, it can be implemented by software (S / W) without changing hardware (H / W) in the existing general WLL terminal, and it is possible to use the general wired switch as it is. Has the advantage.

Claims (4)

In the wireless subscriber network terminal, Setting an timer when the off-hook occurs in the standby state, and checking whether the timer expires; When the timer expires, transitioning to a system access state, calling without a telephone number, and checking whether a Receive Service Connect Message is received in a traffic state; Key scan when the check result message is received, and if the check result message is not received, returning to the access state and uploading a system origination message back to the system; ; When the key is received, a Send DTMF Message corresponding to the key value is transmitted to the system, and in the system receiving the message, the message is interpreted, converted into analog, and sent to the exchange by wire. Bypassing; Receiving, by the exchange, a procedure according to a numbering plan by receiving the message, and ringing a ringing tone to a terminal; Checking, by the terminal, whether or not a ring tone is received from the exchange, if a ring tone is not received, performing a new key search; And checking the recovery release order according to the on-hook of the transmitting side or the receiving side of the terminal, and returning to the initial stage when the command is received. How to send dial tone from the terminal. The terminal of claim 1, wherein the terminal is in the off hook state. When posting an origination message, the service option supported by the system is set in the menu in advance and stored in nonvolatile memory, and the service option negotiation procedure is performed. Dial tone transmission method in a wireless subscriber network terminal, characterized in that to perform a quick call setup by omission. The terminal of claim 1, wherein the terminal is in the off hook state. When a key is input at a call setup time by a user, a method for transmitting a dial tone in a wireless subscriber network terminal, comprising performing a key buffering algorithm. The method of claim 3, wherein the key buffering algorithm, Stores the key value pressed by the user at any address in the SRAM, retrieves the SRAM designated as the buffering address when the service connect message comes down from the system, and if there is a key value A method of transmitting a dial tone in a wireless subscriber network terminal, characterized by performing a key buffering algorithm by sequentially transmitting to the system.