KR19990059022A - Control Method of Bypass Mode Switching Operation of Mobile Communication System Vocoder - Google Patents

Abstract

The present invention provides a voice in a mobile communication system (MOBILE TELECOMMUNICATION SYSTEM) that performs communication using a CDMA (CODE DIVISION MULTIPLE ACCESS) method or a TDMA (TIME DIVISION MULTIPLE ACCESS) method. The present invention relates to an operation control method of a VOCODER for modulating and demodulating a signal. In particular, when either party of a sender and a receiver communicates using a fixed terminal, the VOCODER operates in a vocoding mode. In the operation mode control method of the vocoder to switch the operation mode of the vocoder to operate in the bypass mode when the communication using the, the bypass mode switching method of the vocoder, the paging signal for the call connection request of the caller terminal Response to detect whether or not a response message indicating whether or not the called terminal responds to A detection step (100) and; If it is determined that a response message indicating a response of the called party terminal is received as a result of performing the response status detecting step, the called party vocoder and the calling party are simultaneously switched to the bypass mode of the called party vocoder and the calling party vocoder. Bypass mode switching operation control of the mobile communication system vocoder, characterized in that it comprises a mode switching control step of transmitting a bypass mode switching message 200 which is a message to switch the operation mode of the vocoder to the bypass mode to the side vocoder. Way.

The present invention has an effect that can prevent the degradation of the call quality due to the mismatch of the bypass mode switch.

Description

Control Method of Bypass Mode Switching Operation of Mobile Communication System Vocoder

The present invention provides a voice in a mobile communication system (MOBILE TELECOMMUNICATION SYSTEM) that performs communication using a CDMA (CODE DIVISION MULTIPLE ACCESS) method or a TDMA (TIME DIVISION MULTIPLE ACCESS) method. The present invention relates to a method of controlling an operation of a vocoder for modulating and demodulating a signal. In particular, an operation of a bypass mode of a vocoder in a bypass mode is performed at an exchange to bypass a receiver terminal and a caller terminal. By performing the mode operation at the same time, it is to prevent the degradation of the call quality due to the mismatch of the bypass mode operation time point between the called party terminal and the calling party terminal.

As is well known, a mobile communication system is a communication system for a mobile device such as a person, a car, a ship, a train, an aircraft, and includes a mobile phone (mobile phone, a vehicle phone), a port phone, an aircraft phone, a mobile public phone ( Trains, cruise ships, express buses), radio calling, radiotelephony, satellite mobile communication, amateur radio, and fishing service ships.

Such mobile communication includes an AMPS (ADVANCED MOBILE PHONE SERVICE) system using an analog method, a CDMA system using a DIGITAL method, a TDMA system, and a FDMA (FREQUENCY DIVISION MULTIPLE ACCESS: frequency division multiple access) system.

As shown in FIG. 1, the CDMA system selectively or simultaneously supports the services of the AMPS system and the services of the CDMA system, thereby being a terminal device that enables a subscriber to communicate through a mobile communication network. 10; A base station (BASE TRANSCEIVER SUBSYSTEM) 20 for communicating with the terminal 10 using a protocol defined in IS-95 in a wireless section; A base station controller 30 for controlling the radio link and the wired link and performing a handoff function for maintaining the continuity of the call even when the subscriber is moving; A switching station (MOBILE SWITCHING CENTER) 40 which configures a subscriber's call path and performs a connection with another communication network; Subscriber information is entered, and consists of a home location register (HOME LOCATION REGISTER) (50) for communicating with the switching center (40).

In such a mobile communication system, when a subscriber attempts to access a call through a calling party terminal, the mobile communication network (eg, CDMA network, PSND (PUBLIC SWITCHED DATA) is transmitted through the base station 20, the control station 30, and the switching station 40. NETWORK, etc.) to connect with the called party.

Here, the home location register 50 is a system for storing subscriber information.

On the other hand, the vocoder mounted on the control station 30 of the mobile communication system performs an operation of modulating or demodulating a voice during a call between a caller and a called party, and is used in both a vocoding mode and a bypass mode.

In general, when a call between a mobile communication terminal and a fixed terminal is used in the vocoding mode, the call is used both of the bypass between the mobile communication terminal. This is because there is no need for vocoding due to the characteristics of the mobile communication system. Here, the reason for using the bypass mode is to improve the sound quality by removing the modulation error and the demodulation error generated when the voice is modulated and demodulated.

Hereinafter, a process in which the vocoder is normally set to the vocoding mode and the call is switched to the bypass mode to perform a call will be described in detail with reference to FIGS. 2 and 3 as follows.

First, when a caller attempts to access a call through the caller terminal 10a and the called party terminal 10b responds, the voice message in the control station 30b controlling the operation of the called party terminal 10a is answered. After the selector 32b of the TRANSCODING SELECTOR BANK (hereinafter referred to as TSB) receives and operates the receiving side vocoder 31b in bypass mode, the CALL CONTROL PROCESSOR: CCP 33b) to the switch 40 'of the switching center 40.

Then, the exchange 40 'transmits the response message of the called party's terminal to the selector 32a through the CCP 33a of the calling party, and the calling side selector 32a receiving the response message of the called party's terminal is the caller. The side vocoder 31a is operated in the bypass mode.

3 illustrates the bypass mode switching process, which will be described below.

First, when a caller attempts to call through the caller terminal 10a, the call connection request signal is received by the switch 40 'via the caller side base station 20a and the control station 30a.

Then, the switch 40 'transmits an "Alerting with Info" signal, which is a RingBack tone signal, to the caller terminal 10a side, and an "Alerting with," which is a paging signal, to the called party terminal 10b side. Info "signal.

That is, when the switch 40 'transmits an alerting signal to the calling party CCP 33a, the CCP 33a receives the alerting signal Msg_Alert and transmits the alerting message to the selector 32a. Then, the selector 32a transmits an "Alerting with Info" signal to the caller terminal 10a.

In addition, after the exchange 40 'transmits the alarm signal to the calling party CCP 33a, the switching unit 40' transmits a "Call_confirm" signal, which is a signal indicating a call connection, to the called party CCP 33b. Then, when the CCP 33b receives this and transmits an alert message Msg_Alert to the selector 32a, the selector 32b transmits an "Alerting with Info" signal to the called party terminal 10b.

On the other hand, when the called party responds to the " Alerting with Info " signal transmitted from the selector 32b through the called party terminal 10b, the called party terminal 10b issues a connect command (Connect_order) for requesting connection. Will be sent to.

The selector 32b receiving the connection command Connect_order sends a bypass command to the vocoder 31b to switch the operation mode of the vocoder 31b to the bypass mode, thereby bypassing the operation mode of the vocoder 31b. After switching to the pass mode, the connection message Msg_Connect is transmitted to the CCP 32b.

Thereafter, the called party CCP 32b transmits a Connect signal to the switch 40 ', and the switch 40' sends the Connect signal to the calling party CCP 32a, and the calling party CCP 32a receives the signal. The connection message Msg_Connect is transmitted to the selector 32a.

Then, the selector 32a receiving the connection message Msg_Connect transmits a bypass command to the caller side vocoder 31a to switch the operation mode of the vocoder to the bypass mode. The vocoder 31a, which has received the Bypass command, switches the operation mode to the bypass mode and makes a call with the called party's terminal 10b.

At this time, after the vocoder 31b on the called side is converted to the bypass mode, it takes an average time of about 20 msec to 40 msec before the vocoder 31a on the calling side is converted to the bypass mode and operated.

In addition, during the above time (about 20 msec to 40 msec) before the calling party terminal is switched to the bypass mode after the called party terminal is switched to the bypass mode, the calling party terminal enters the vocoding mode state and the called party terminal is bypassed. The pass mode will be maintained.

Therefore, severe noise is generated at the calling party terminal and silence at the called party terminal.

In general, after the called terminal is switched to the bypass mode, the time required for the calling terminal to be switched to the bypass mode is a very short time (about 20 msec to 40 msec), which makes the subscriber almost unrecognizable.

However, in the conventional vocoder operation control method as described above, when the time required for the caller terminal to switch to the bypass mode after the caller terminal is switched to the bypass mode becomes long, the caller is in a severe noise state. There is a problem in that the call is put in a silent state and degrades the call quality, and malfunctions due to inconsistency of the vocoder mode prevents a normal call.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems. In particular, when the call between the mobile communication terminals, the switching in the switch to perform the switching operation of the calling party terminal and the calling terminal vocoder to bypass mode at the same time In addition, the present invention provides a " method for controlling the bypass mode switching operation of a mobile communication system vocoder " which can prevent a decrease in call quality due to a mismatch of a bypass mode operation time between a called party terminal and a calling party terminal.

In order to achieve the above object, the present invention "method for controlling the bypass mode switching operation of a mobile communication system vocoder", when either party of the sender and the receiver communicates using a fixed terminal, operates in the vocoding mode, In the method of controlling the operation mode of the vocoder to switch the operation mode of the vocoder to operate in the bypass mode when the caller and the receiver both communicate using the mobile terminal,

The vocoder bypass mode switching method includes: a response detection step of detecting whether or not a response message indicating whether a called terminal responds to a paging signal for a call connection request from a calling terminal; If it is determined that a response message indicating a response of the called party terminal is received as a result of performing the response status detecting step, the called party vocoder and the calling party are simultaneously switched to the bypass mode of the called party vocoder and the calling party vocoder. And a mode switching control step of transmitting a bypass mode switching message, which is a message to switch the operation mode of the vocoder to the bypass mode, to the side vocoder.

In addition, the detection of the response of the receiver terminal in the response detection step is characterized in that the exchange detects whether the connection message received from the selector through the CCP.

In addition, the bypass mode switching message of the mode switching control step, characterized in that for transmitting at the same time to the called terminal and the calling party terminal at the exchange.

The bypass mode switch message is characterized in that when the exchange receives a response message of the called terminal.

In addition, the bypass mode switching message of the mode switching control step, when the exchange receives a response message from the called party's terminal, sends a connection message to the calling party's vocoder and responds to the access message transmitted from the CCP to the calling party's vocoder. Characterized by a message.

The present invention "method of controlling the bypass mode switching operation of the mobile communication system vocoder" is that, when the called terminal responds to the paging signal for the call connection request of the calling terminal, the response message is received at the exchange, the called party's vocoder at the exchange. And the caller side vocoder to switch to bypass mode at the same time, and the operation mode of the receiver side vocoder and the caller side vocoder is simultaneously switched to bypass mode. Will be able to prevent.

1 is a block diagram schematically showing a configuration of a mobile communication system;

2 is a block diagram schematically illustrating a configuration of a mobile communication system to explain a process of switching a vocoder to bypass mode;

3 is a control flowchart illustrating a bypass mode switching operation control method of a conventional mobile communication system vocoder;

4 is a flowchart illustrating a method for controlling bypass mode switching operation of a vocoder of a mobile communication system according to the present invention;

5 is a control flow diagram illustrating an embodiment of the present invention "method for controlling the bypass mode switching operation of a mobile communication system vocoder",

Figure 6 is a control flow diagram showing another embodiment of the present invention "method for controlling the bypass mode switching operation of the mobile communication system vocoder".

<Explanation of symbols for important parts of the drawing>

10: terminal 10a: caller side terminal

10b: called party's terminal 20: base station

20a: Calling party base station 20b: Calling party base station

30: control station 30a: caller side control station

30b: called party control station 31a: calling party vocoder

31b: Caller side vocoder 32a: Caller side selector

32b: Called party selector 33a: Called party CCP

33b: Callee's side CCP 40: Exchange

40 ': Exchange 50: Home location register

100: response status detection step 200: mode switching control step

Hereinafter, with reference to the accompanying drawings, the configuration, operation and effect of the embodiment according to the technical idea of the present invention "method of controlling the bypass mode switching operation of the mobile communication system vocoder" configured as described above are as follows.

In the present embodiment, the same reference numerals are given to the same components as the conventional apparatus.

Example 1

This embodiment 1 is a bypass mode switching message for instructing the switching mode of the called party's vocoder and the calling party's vocoder to the bypass mode by using a new message "Transcoding_Mode". Example.

First, as shown in FIG. 4 and FIG. 5, after transmitting the paging signal "Alerting with Info" for the call connection request of the calling party terminal to the called party terminal 10b, the response detection step 100 is performed. The presence or absence of a connection command (Connect_order) transmitted from the called party terminal 10b is detected.

At this time, when a connect command (Connect_order) of the called terminal (10b) is received through the selector 32b and the CCP (33b) to the switch 40 ', the mode switching control step 200 is performed, the switch 40 ') Transmits, to the called vocoder 31b and the calling vocoder 10a, the control signal " Transcoding_Mode " to switch the operation mode of the vocoder to the bypass mode.

That is, when the switch 40 'receives a connection command (Connect_order) of the called party terminal 10b through the called party selector 32b and the CCP 33b, the " Transcoding_Mode " signal is sent to the called party CCP 33b and the caller. Simultaneous transmission to the side CCP 33a is performed.

Then, the called CCP 33b and the calling CCP 33a transmit the received "Transcoding _ Mode" signal to the called side selector 32b and the calling side selector 32a, respectively, and receive the "Transcoding_Mode" signal. The destination selector 32b and the sender side selector 32a transmit a "Transcoding_Mode" signal, which is a control command for instructing the bypass mode switch, to the destination vocoder 31b and the caller-side vocoder 31a. .

Therefore, a control command for switching the operation mode of the vocoder to the bypass operation mode is simultaneously transmitted to the called side vocoder 31b and the calling side vocoder 31a, and the receiving side vocoder 31b and the calling side vocoder are received. 31a performs communication between the caller and the called party using the mobile communication terminal by switching each operation mode to the bypass mode.

That is, the bypass mode switching message ("Transcoding_Mode" in the present embodiment) simultaneously transmitted by the switch 40 'is simultaneously received by the receiving side vocoder 31b and the calling side vocoder 31a to bypass the operation mode of the vocoder. By switching to the mode, it is possible to eliminate noise or silence caused by inconsistency in switching of the bypass mode.

Example 2

The second embodiment is a bypass mode switching message instructing the switching mode of the called party's vocoder and the calling party's vocoder to the bypass mode. The sender's vocoder 31a transmits the same connection message as before. The vocoder is an embodiment for performing a switching operation to the bypass mode by using a new response message (Connect_Ack) indicating a response to the connection message transmitted from the CCP.

First, as shown in FIG. 4 and FIG. 6, after transmitting the paging signal "Alerting with Info" for the call connection request of the calling party terminal to the called party terminal 10b, the response detection step 100 is performed. The presence or absence of a connection command (Connect_order) transmitted from the called party terminal 10b is detected.

As a result of performing the response detection step 100, when a connection command (Connect_order) of the called party terminal 10b is received through the selector 32b and the CCP 33b to the switch 40 ', mode switching control Step 200 is performed.

That is, when a connection command (Connect) of the called party terminal 10b is received at the switch 40 'via the called side selector 32b and the CCP 33b, the switch 40' receives the called side CCP 33b. Transmits a response message "Connect_Ack" to the connection command (Connect), and transmits a connection command "Connect" signal to the caller side CCP 33a.

Then, the called CCP 33b receiving the "Connect_Ack" signal, which is a response message to the connect command, transmits it to the called party selector 32b again, and the connection transmitted from the exchange 40 '. The caller side CCP 33a receiving the command " Connect " signal transmits the connection message Msg_Connect to the caller side selector 32a.

In addition, the receiving side selector 32b receiving the "Connect_Ack" signal transmits a "Bypass command" signal, which is a control signal for switching the operation mode of the receiving side vocoder 31b to the bypass mode, to the receiving side vocoder 31b. The caller-side selector 32a receiving the connection message Msg_Connect sends a " Bypass command " signal, which is a control signal for switching the operation mode of the caller-side vocoder 31a to the bypass mode, to the caller-side vocoder 31a. Will be sent).

Therefore, the "Bypass command" signal, which is a control command to switch the operation mode of the vocoder to the bypass operation mode, is simultaneously transmitted to the called side vocoder 31b and the calling side vocoder 31a, and the receiving side vocoder ( 31b) and the caller side vocoder 31a switch the operation mode from the vocoding mode to the bypass mode to perform communication between the caller and the called party using the mobile communication terminal.

That is, the bypass mode switching message transmitted simultaneously from the exchange 40 '(in the present embodiment, the "Connect_Ack-Connect_Ack-Bypass command" command to the caller side vocoder 31a and the "Connect-Msg_Connect-" command to the receiver side vocoder 31b). Bypass command "command) is simultaneously received by the receiving side vocoder 31b and the calling side vocoder 31a, and the operation mode of the vocoder is switched to the bypass mode. The phenomenon can be solved.

In the present embodiment, however, the response message of the called party's terminal is detected by the exchange and limited to controlling the switching operation of the called party's vocoder and the calling party's vocoder to the bypass mode. As long as it does not, the base station or the control station can be configured to perform the role of the exchange.

In this case, however, the transmission time of the bypass mode switching message is controlled in consideration of the propagation delay time.

As described above, in the "method of controlling the bypass mode switching operation of the mobile communication system vocoder", in particular, the called party terminal responds to the paging signal for the call connection request of the calling party terminal. In this case, the switching unit commands the receiver side vocoder and the calling side vocoder to switch to the bypass mode at the same time, and simultaneously switches the operation mode of the receiver side vocoder and the calling side vocoder to the bypass mode. There is an effect that can prevent the degradation of the call quality due to inconsistency.

Claims (5)

When either party of the calling party and the called party communicates using a fixed terminal, the vocoder operates in the vocoding mode. When both the calling party and the called party communicate using the mobile terminal, the vocoder operates in bypass mode. In the operation mode control method of the vocoder to switch, The vocoder bypass mode switching method includes: a response detection step of detecting whether or not a response message indicating whether a called terminal responds to a paging signal for a call connection request from a calling terminal; If it is determined that a response message indicating a response of the called party terminal is received as a result of performing the response status detecting step, the called party vocoder and the calling party are simultaneously switched to the bypass mode of the called party vocoder and the calling party vocoder. And a mode change control step of transmitting a bypass mode change message, which is a message to switch the operation mode of the vocoder to the bypass mode, to the side vocoder. The bypass mode switching of the vocoder of the mobile communication system according to claim 1, wherein the detection of the response of the receiver terminal in the response detection step is detected by the exchange as receiving the connection message applied from the selector through the CCP. Motion control method. The method of claim 1, wherein the bypass mode switching message of the mode switching control step is simultaneously transmitted from the exchange to the called party's terminal and the calling party's terminal. 4. The method of claim 3, wherein the bypass mode switch message is transmitted when a response message of the called party terminal is received at the exchange. The connection mode of claim 1, wherein the bypass mode switch message of the mode switch control step is a transmission message to the caller side vocoder and a caller side vocoder transmitted from the CCP when the exchange receives a response message from the called party's terminal. A method of controlling the bypass mode switching operation of a vocoder of a mobile communication system, characterized by a response message to a message.