KR100372054B1 - Method for dynamic loopback-call processing in mobile communication system - Google Patents

Abstract

The present invention relates to a dynamic loopback call processing method in a mobile communication system, and the present invention can test call performance more accurately by including a vocoder in a loopback path for sound quality test, while controlling Using the debugging monitor of the transcoder and selector bank of the station, the operator directly changes the control section to loop back to a specific channel so that the performance and sound quality of a specific vocoder can be achieved even during normal call processing. The measurement is enabled, and the two mobile terminals perform the respective loopbacks so that the control unit switches the transmission / reception signals of the two terminals to cross each other, thereby moving to the base station and the control station alone without interworking with the exchange. A call processing of a terminal-to-mobile terminal is possible.

Description

Method for dynamic loopback-call processing in mobile communication system

The present invention relates to a dynamic loopback call processing method in a mobile communication system. The present invention relates to a mobile communication system capable of performing a call processing of a mobile terminal to a mobile terminal without an accurate sound quality test using a vocoder and interworking of an exchange. On how to handle dynamic loopback.

In general, when a call establishment request is received from a mobile subscriber, the digital mobile communication system allocates resources of the mobile communication system such as allocating a channel for call establishment, forms a call, and then provides a mobile communication service. .

When an outgoing call, incoming call, or handoff call is generated from a mobile station (MS), the base transceiver station (BTS) processes a call request in the base station controller (BSC). Send to the Call Control Processor (CCP). In response, the CCP of the control station receives the call processing request and performs the call processing.

FIG. 1 is a block diagram of a mobile communication system using a general CDMA system, and includes a mobile terminal 10, a base station 20, a control station 30, an exchange station 40, and a wired terminal 50. As shown in FIG.

First, in the mobile terminal 10, the operation for making a telephone call with a general line subscriber, that is, the wired terminal 50, first, when a call is set, the user inputs a voice signal through the mobile terminal 10. The mobile terminal 10 converts the input voice data into QCELP (Qualcomm Code Excited Linear Predictive) data, and then converts the converted QCELP data through the base station 20 to the TSB (Transcoder And Selector Bank) of the control station 30 ( 31), where QCELP is voice packet data.

The TSB 31 of the control station 30 transmits the QCELP data to the vocoder 32 in the control station 30, and the vocoder 32 transmits the QCELP data transmitted from the TSB 31 to the PCM (Pulse Code Modulation). After encoding the data, it is transmitted to the wired terminal 50 through the switching center 40. Therefore, the general line subscriber hears the voice signal input through the mobile terminal 10.

On the other hand, when a general line subscriber sees an operation for making a phone call with the mobile terminal 10 through the wired terminal 50, the call is first set, and then a voice signal is input through the wired terminal 50, the wired terminal. 50 decodes the input voice signal into PCM data and transmits it to the vocoder 32 of the control station 30 through the switching center 40.

The vocoder 32 decodes the PCM data transmitted from the switching center 40 into QCELP data, and then transmits it to the mobile terminal 10 through the TSB 31 and the base station 20 of the control station 30. Therefore, the telephone call between the mobile terminal 10 and the wired terminal 50 is made.

As described above, the above-mentioned sound degradation may occur due to an abnormal condition of the base station 20, the control station 30, or the switching station 40 during the telephone call.

Therefore, the control station has a loopback function in which the user's voice is heard by making the outgoing data and the incoming data of the terminal the same to measure the sound quality.

The conventional loopback function uses a method of looping back call data introduced through the base station to the control station's TSB without passing through the vocoder and transmitting the call data back to the calling terminal through the control station and the base station.

However, this conventional method does not perform the encoding and decoding processes of speech data because it does not go through a vocoder, and thus there is a problem in that a precise call processing performance test result for a sound quality test cannot be obtained.

In addition, the conventional loopback method has a problem in that a voice quality test and a call processing test by two-way communication with other terminals can not be accurately performed by taking a form of speaking and listening to one's own voice data.

In addition, the conventional method allows only one test at a time because all calls are operated and maintained while the control station is already set to the loopback mode, so that the sound quality and performance of a specific vocoder can be tested during normal call processing rather than a loopback call. There is no problem.

Therefore, the present invention has been proposed to solve all the problems according to the prior art as described above, the object of the present invention is

The inclusion of a vocoder in the loopback path allows for more accurate call processing performance, while it performs some functions of the exchange within the control station Transcoder And Selector Bank (TSB) to allow loopback testing of specific calls during normal call processing. The present invention provides a method for processing a dynamic loopback in a mobile communication system that enables call processing of a mobile terminal to a mobile terminal without interworking with a switch.

Dynamic loopback call processing method in a mobile communication system according to the present invention to achieve the above object,

Determining whether the call requested for channel allocation from the control station is a general call or a loopback call;

Performing a general general call processing in the case of a general call, encoding and decoding a call through a vocoder in the case of a loopback call, and looping back the E1-link so that a signal does not go out and returns to the base station;

When the test on a specific vocoder channel is required during the general call processing, the operator directly operates the switching of the control station Transcoder And Selector Bank (TSB) to loop back only to the specific vocoder. .

In addition, the dynamic loopback call processing method in the mobile communication system according to the present invention,

In processing a general call at a control station, if a Mobile to Mobile call processing is required, performing a loopback process only for a specific channel by direct manipulation of an operator;

Performing the same channel loopback on the opposite terminal, and then establishing a communication path between the two mobile terminals by switching the transmit / receive signals of the two mobile terminals to cross each other;

In the processing of the loopback call at the control station, when the mobile to mobile call processing is required, additionally switching the channel by looping directly by the operator while all channels are in the loopback mode;

The same channel loopback is performed for the other terminal required for the two-way communication, and the communication channel between the two mobile terminals is established by switching the transmission / reception signals of the two mobile terminals to cross each other. It is characterized by the methodological configuration.

1 is a block diagram of a mobile communication system using a general CDMA scheme.

FIG. 2 is a block diagram showing the inside of a transcoder and selector bank (TSB) of a control station to which the present invention is applied;

3 is a flowchart illustrating a dynamic loopback call processing method in a mobile communication system according to the present invention.

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

100: Transcoder And Selector Bank (TSB)

300: Vocoder

400: Mobile Switching Center (MSC)

Hereinafter, the dynamic loopback call processing method in the mobile communication system according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram of a control station within a transcoder and selector bank (TSB) to which the present invention is applied.

As shown, the TSB 100 of the control station receives the voice and control data from the control station 200 and sends it back to the base station through the control station, and the switching station 400 and the E1-link. An output unit 102 connected to interface data, an input / output buffer 103 that temporarily stores input data and exits the output unit, and detects and analyzes data introduced into the input / output buffer 103. A sensing unit 104, a control unit 105 for determining how to process the data analyzed by the sensing unit 104 and controlling the switching device, and a switching device for switching to the vocoder 300 in response to a command of the control unit It consists of 106.

The overall operation of the control station TSB 100 configured as described above is as follows.

First, when the vocoder 300 allocation request of the call processing block of the control station 200 enters the input unit 101 of the TSB 100, this data is first stored in the input / output buffer 103 of the TSB 100. The stored data can be recognized by the sensing unit 104 as an input or an output.

Then, the controller 105 determines the message of the data stored in the input / output buffer, and determines whether it is the data for general call processing or the message for the loopback call, and controls the switching device.

If the general call is processed, the control unit 105 of the TSB 100 connects a specific channel on the E1-link with the vocoder 300. Therefore, data stored in the input / output buffer 103 is loaded on the E1-link after performing data conversion via the vocoder 300, and a general call processing path is set.

When the data stored in the input / output buffer is a loopback call, the control unit 105 operates in the same manner as the general call processing process, and then loops back the entire E1-link so that the control unit 105 does not finally go out to the output unit 102.

In this case, the data flowing into the input unit 101 is loaded on the E1-link via the vocoder 300 and then re-entered into the input unit again to exit the control station.

When looping back to a specific channel while processing a general call by the operation as described above, the operator gives a command to the control application block directly through a debugging monitor for monitoring the operation of the TSB, so that the controller 105 Will change. In other words, it commands a channel so that loopback call is possible even during normal call processing.

When the operator issues a channel loopback command to the control unit, the control unit loops back one channel on the E1-link so that all data carried on this channel is introduced from the output to the input and transmitted to the control station.

Next, the operation of the TSB 100 for Mobile to Mobile (mobile terminal to mobile terminal) call processing will be described.

First, after performing a specific channel loopback process during the general call processing, and then channel looping back the channel in which the call is set for the other mobile terminal in the same way, the two mobile terminals are in the voice loopback state to listen to their own voice. do.

With the two mobile terminals performing channel loopback as described above, the control unit 105 causes the control unit 105 to cross the transmission / reception signal paths of the two mobile terminals through the debugging monitor of the TSB 100 again. Command to switch In other words, the Tx of the first mobile terminal becomes the Rx of the second mobile terminal, and the Rx of the first mobile terminal becomes the Tx of the second mobile terminal, so that both communication paths are established.

3 is a flowchart illustrating a dynamic loopback call processing method in a mobile communication system according to the present invention.

The process of performing the loopback call process in FIG. 3 will now be described.

First, in a state in which a call processing procedure between a terminal and a base station is being performed, a base station requests a vocoder channel corresponding to its own channel from the base station to the control station (S111).

Subsequently, the call processing block of the control station artificially requests the allocation request of the specific vocoder channel to the switching control application block of the control station Transcoder And Selector Bank (TSB) (S113).

In step S113, the exchange determines the vocoder resource of the control station, requests the call control application block of the control station to allocate to the control station, and requests the control station again. In this step, the call control block of the control station determines the vocoder resource of the TSB to make the same flow as that requested by the exchange, and is set to the flow requiring the TSB.

In step S113, it is determined whether the requested call is a loopback call (S115).

As a result of the determination in step S115, if the loopback call is correct, the switching device is set to the loopback mode (S117).

Subsequently, all vocoders process the loopback call (S119).

In step S119, the loopback setting request for the single call test is also carried on the requested link and the requested channel in the same manner as the normal call processing request. At this time, the corresponding link is first looped back to prevent the call from going out through the E1-link.

In this case, the voice data is transmitted to the E1-link through encoding of the vocoding algorithm, and then looped back and transmitted to the vocoder, which is then decoded, which is delivered to the control station, and then to the channel of the base station. Because one-to-one communication takes place, the operator is placed in the loopback mode where he or she hears. Here, the request transmitted to the TSB means that the vocoder channel will be carried on a specific channel on a specific E-1 link.

Subsequently to step S119, it is determined whether or not to perform a Mobile to Mobile call processing in the state of performing a call processing in the loopback mode (S121). If it does not, call Mobile to Mobile call processing.

Next, a process of performing a specific channel loopback during general call processing and general call processing will be described.

First, steps S113 and S115 described above and step S115 for determining whether the requested call is a loopback call is performed.

As a result of the determination in step S115, if it is determined that the call is not a loopback call, that is, a normal call processing request, the switching device is set to the normal mode, and the requested vocoder is loaded into the channel of the requested link (S125).

Subsequently, it is determined whether only a specific channel loops back for a test of a specific vocoder during the general call processing (S127).

As a result of the determination in step S127, if the specific channel is not looped back, general call processing is started after step S125 (S131).

If it is determined in step S127 that the specific channel is looped back during the general call processing, only the specific channel is set to the loopback mode state (S129). That is, the operator artificially configures the switching to loop back only the call for a certain call through the debugging monitor of the TSB.

In this case, in step S133, all the vocoder performs the general call processing, but only the specific vocoder performs the loopback call processing, so that the sound quality and performance test for the specific channel can be performed even in the normal mode.

Subsequently to step S133, it is determined whether the loopback processing of a specific channel is a case of performing a Mobile to Mobile call processing (S135), and if the Mobile to Mobile call processing is performed, the corresponding step is performed. If it does not perform Mobile to Mobile call processing, it ends.

Finally, the process of performing the Mobile to Mobile (mobile terminal to mobile terminal) call processing in FIG. 3 will be described as follows.

Mobile to Mobile call processing is the operator's direct assignment of two channels to the channel loopback function for two calls and is applicable to both normal mode and loopback mode.

The Mobile to Mobile call processing method in the loopback mode is

In the process of processing the loopback call, if it is determined in step S121 that the mobile to mobile call processing is correct, the operator loops the specific channel by directly operating the switching as in the case of looping back a specific channel during general call processing (S123). ).

Subsequently, the counterpart terminal is looped back in the same manner (S137).

Subsequently, switching is performed by crossing the transmission / reception signal paths of the two mobile terminals (S139).

When the step S139 is described in detail, if the operator directly adjusts the switching through the debugging monitor of the TSB and loops back the data output from the TSB through the E1-link only for a specific channel, it is inputted into the TSB and loaded into the data memory inside the TSB. When the loaded data is switched to a desired vocoder, mutual communication with the connected vocoder is enabled, so that two communication paths are established in two mobile terminal periods (S133).

The Mobile to Mobile call processing method in the normal mode is

As a result of the determination in step S135, if the mobile to mobile call processing is correct, channel loopback is performed in the same manner with the counterpart terminal (S137), and the transmission / reception paths of the two terminals are crossed and switched (S139), The subsequent process of setting up a communication path between two parties is the same as performing a Mobile to Mobile call processing in a loopback mode.

In the mobile communication system according to the present invention as described above, the dynamic loopback call processing method can test the accurate sound quality test and call processing performance by including a vocoder in the loopback path for sound quality test, and the operator directly switches By looping over a specific channel by using the, it is effective to test a specific vocoder which is judged to have a problem even during normal general call processing. In addition, by switching the transmission / reception paths while the two terminals are looped back in a channel, the mobile station can be set up by performing a Mobile to Mobile call process with the control station and the base station alone without interworking with the exchange. It is effective.

Claims (5)

In a loopback call processing method in a mobile communication system consisting of a mobile station, a base station, a control station, and a switch, When a vocoder channel request is generated from the base station to a control station, a first step of requesting, by a call processing block of the control station, an artificially requesting allocation of a specific vocoder channel to a switching control block of a transcoder and selector bank (TSB); A second step of the request call determining a loopback call; A third step of looping back the corresponding link by setting the switching device in the control station TSB to the loopback mode as a result of the determination; In the loopback mode, it is determined whether call processing is performed between mobile stations, and as a result, a dynamic loopback call is performed in the mobile communication system, in the case of call processing between mobile stations, after performing dynamic loopback call processing between mobile stations. Treatment method. The method of claim 1, wherein performing call processing between mobile stations in the loopback mode comprises: A first step of the operator directly operating the switching of the control station TSB to loop back the channel for the specific mobile station; Performing a channel loopback on the opposite mobile terminal; And performing a third step of establishing a communication path between mobile stations without interworking with an exchange by switching transmission / reception signals of two mobile stations at the intersection. The method of claim 1, wherein the third step of looping back the corresponding link by setting the switching device in the control station TSB to the loopback mode comprises performing encoding and decoding by passing the loopback call through a vocoder, and then performing an external connection through the E-1 link. A method for processing a dynamic loopback call in a mobile communication system, which prevents the user from going out. In a loopback call processing method in a mobile communication system consisting of a mobile station, a base station, a control station, and a switch, When a vocoder channel request occurs from the base station to the control station, a first step of requesting to artificially allocate to the switching control block of the TSB in the call processing block of the control station; A second step of determining whether the request is a loopback call; A third step of setting the switching device in the control station TSB to the normal mode if the determination result is not the loop back call; Determining whether to loop back a specific channel in the normal mode; As a result of the determination in the fourth step, if the specific channel is not looped back, after performing normal general call processing and terminating it, if the specific channel is looped back, the operator directly operates switching to loop back only the vocoder of the specific channel. Step 5; Determining whether the loopback call processing of the specific channel is for call processing between mobile stations; And as a result of the sixth step, if the call processing is performed between mobile stations, performing a seventh step of performing a dynamic loopback call processing between the mobile stations and ending the mobile loop system. 5. The method of claim 4, wherein performing dynamic inter-loopback call processing when the specific channel loopback is for inter-mobile call processing, Performing a channel loopback for the opposite mobile station; A method of processing a dynamic loopback call in a mobile communication system, comprising performing a second step of establishing a communication path between mobile stations without interworking with an exchange by switching transmission / reception signals of two mobile stations at the intersection.