KR100430653B1 - Time Alignment Part of Vocoder in IWU of MSC and Operating Method thereof - Google Patents

Abstract

The present invention provides a time alignment unit of an vocoder device in an IWU of an MSC that is suitable for optimal memory use in controlling a memory for implementing a time alignment function of a vocoder device in an interworking unit (IWU) of a mobile switching center (MSC). The present invention relates to a channel in which a call setup is made through control information, a synchronization signal, and a clock signal of an upper MP received from a time alignment controller after receiving an AMR packet signal encoded without a delay from a transcoder in a corresponding vocoder device. One delay memory for delaying the AMR packet signal by the first and second times to implement time alignment; Complexity of the time alignment function is implemented by including a delay logic unit for applying to the time alignment controller the AMR packet signals delayed by the first and second time allocated to the delay memory based on the synchronization signal. The number of memories and the number of memories can be reduced to improve the space constraints of the vocoder device and to reduce the cost.

Description

Ms. Time Alignment Part of Vocoder in IWU of MSC and Operating Method

The present invention relates to the time alignment of the vocoder device in the IWU of the MSC, and more particularly, to the vocoder device in the IWU of the MSC, which is suitable for optimal memory use in controlling the memory for implementing the time alignment function of the vocoder device in the IWU of the MSC. Relates to the time alignment of.

Generally, based on the Core Network (CN) Reference Model proposed by the Third Generation Partnership Project (3GPP) system, each MSC houses an IWU for processing Pulse Code Modulation (PCM) voice data. It plays a role by call type and control.

1 is a block diagram showing, in functional terms, the configuration of an IWU in an MSC related to the present invention.

As shown in FIG. 1, the IWU in the MSC includes an ATM processing apparatus 11, a vocoder apparatus 12, a traffic pool apparatus 13, and an E1 / No.7 interface apparatus 14. And a control device 15.

In this case, since the switching fabric of the MSC is in an Asynchronous Transfer Mode (ATM), ATM interworking should be possible, and in the case of voice data, an ATM processing apparatus (AAL2) may be used to process the ATM. 11), voice data in a packet form is transcoded through the vocoder device 12.

In addition, the traffic pool device 13 is a time slot for interworking voice data received from the vocoder device 12 to a trunk device and a supplementary service device for PSTN (Public Switched Telephone Network) interworking. Slot) It is in charge of switching function.

In addition, the interface device 14 such as E1, No.7, etc. for TDM (Time Division Multiplexor) data processing linked to the traffic pool device 13 is processed, and each functional device is controlled by the control device 15. Call processing is performed.

Fig. 2 is a block diagram showing the configuration of the vocoder device in the IWU, taking into account the time alignment function.

As shown in FIG. 2, the vocoder device in the IWU includes a time alignment controller 21, a time alignment unit 22, a transcoder 23, a reference processor 24, Call control unit 25 is included.

Here, the voice packet data through the ATM AAL2 processing in the ATM processing apparatus 11 has an UP Frame structure in the form of an adaptive multi-rate codec (AMR) to support multi-rate. In order to efficiently transmit and receive data, a synchronization signal (Frame Sync) is used.

In addition, the vocoder device receives the packet voice data and transmits the voice data to the traffic pool device 13 by frame synchronization of the traffic pool device 13 after performing transcoding. As a result, the PCM-type voice data received by the traffic pool device 13 is transcoded into packet voice data.

In addition, the transcoder 23 encodes the AMR packet voice data with respect to a channel configured according to the call information received through the time alignment controller 21 without delay, and processes the corresponding AMR. After delaying the packet voice data by the time alignment unit 22 for a predetermined time, the AMR packet voice data which is delayed by the predetermined time is applied to the time alignment control unit 21 again.

Accordingly, after selecting the desired AMR packet signal in the upper MP (Main Processor) of the applied AMR packet voice data by the time alignment controller 21, the ATM processor 11 according to the synchronization control signal generated by the reference processor 24. In this case, the reference signal is received by the reference processor 24.

3 is a block diagram illustrating a time alignment unit in the vocoder device.

As shown in FIG. 3, the conventional time alignment unit includes a 20 (ms) delay logic unit 31, a 20 (ms) delay memory 32, a 40 (ms) delay logic unit 33, and 40 ( ms) delay memory 34 is included.

Here, after receiving the AMR packet signal encoded without delay from the transcoder 23, the control information of the upper MP received from the time alignment controller 21, the synchronization signal (Frame Sync) and the clock signal (CLK). The 20 (ms) delay logic section 31 is delayed 20 (ms) using the memory 32 of the double buffer concept according to the 20 (ms) frame synchronization signal. AMR packet voice data is supplied to the time alignment control unit 21.

In addition, the 40 (ms) delay logic unit 33 receives the 20 (ms) delayed AMR packet voice data from the 20 (ms) delay logic unit 31 and performs a double buffer concept memory according to the 40 (ms) frame synchronization signal. AMR packet speech data delayed by 40 (ms) is applied to the time alignment control unit 21 using (34).

Looking at the operation of the vocoder device provided in the IWU in the MSC having the configuration as described above are as follows.

The vocoder device 12 as shown in FIG. 1 converts the PCM data decoded and encoded in the reverse direction to transfer voice data for a call.

As shown in FIG. 2, the AMR packet voice data received by the vocoder device 12 is decoded through the transcoder 23 and transmitted in synchronization with a frame sync received by the traffic pool device 13. It is done.

Accordingly, the traffic pool device 13 is a trunk and No. 7 signal link processing device for PSTN matching based on call control data received from the control device 15 for PCM voice data received from the vocoder device 12. To the E1 / N0.7 interface device 14.

On the contrary, in order to encode the PCM data of the general subscriber and the supplementary service device linked to the voice traffic pool and the voice data received through the matching device in the PSTN into packet voice data, the synchronization signal applied from the traffic pool device 13 ( Framesync) to the vocoder device 12.

Accordingly, the vocoder device 12 transmits the PCM voice data received from the traffic pool device 13 together with the synchronization signal (Frame Sync) together with the synchronization clock CLK received from the reference control unit 24. 23).

Accordingly, the transcoder 23 converts the packet voice data of the AMR upframe structure without delay into the time alignment unit 22 for the channel configured according to the call information received through the time alignment control unit 21. Authorize.

Then, as shown in FIG. 3, the time alignment unit 22 includes two doubles of 20 (ms) and 40 (ms) delay logics 31 and 33 based on the 20 (ms) frame synchronization signal. The AMR packet voice data delayed by 20 (ms) and 40 (ms) is applied to the time alignment control unit 21 using the buffers 32 and 34.

Accordingly, the time alignment control unit 21 selects a desired AMR packet signal from the upper MP from among the AMR packet voice data applied from the time alignment unit 22, and then matches the synchronization control signal generated by the reference processor 24. It transmits to ATM processor 11.

In addition, the ATM processing apparatus 11 maps the packet voice data received in synchronization with the synchronization signal transmitted from the corresponding board to the ATM cell payload, and transmits the packet voice data to the higher MSC system, thereby delivering traffic by call processing in the IWU. You are done. At this time, the additional control according to the call processing for each section is achieved by matching each device linked to the control device 15 using call control information.

However, in the above-described vocoder device, the time alignment unit 20 (ms) and 40 (ms) delay logic unit and 20 (ms), respectively, to generate 20 (ms) and 40 (ms) delayed AMR packet voice data. And because it uses a double buffer type memory for a delay of 40 (ms), there is a problem in that the space on the printed circuit board (PCB) and the cost is not effective in implementing the vocoder device having a time alignment function.

In order to solve the above-described problems, the present invention is to control the memory to be suitable for optimal memory use in the control of the memory for implementing the time alignment function of the vocoder device in the IWU which is the CN component of the 3GPP system There is a purpose.

In addition, the present invention implements the time alignment function using one delay logic unit and one delay memory in the vocoder device in the IWU of the MSC, thereby reducing the complexity of implementing the time alignment function and reducing the number of memories. The aim is to improve space constraints and reduce costs.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram showing a functional aspect of an interworking unit (IWU) in a mobile switching center (MSC) related to the present invention.

FIG. 2 is a block diagram illustrating a vocoder device in FIG. 1; FIG.

3 is a block diagram illustrating a time alignment unit in FIG. 2; FIG.

4 is a block diagram illustrating a time alignment unit of a vocoder device in an IWU of an MSC according to an exemplary embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

40: delay logic section

50: delay memory

In order to achieve the object described above, the time alignment unit of the vocoder device in the IWU of the MSC according to the embodiment of the present invention encodes without delay from the transcoder in the vocoder device in the interworking unit (IWU) of the mobile switching center (MSC). After receiving the processed AMR packet signal, the AMR packet signal is first and second to implement time alignment for the channel in which call setup is made through the control information of the upper MP received from the time alignment control unit, the synchronization signal, and the clock signal. One delay memory for delaying by a second time; And a delay logic unit configured to apply the AMR packet signals delayed by the first and second times allocated to the delay memory based on the synchronization signal to the time alignment controller.

Preferably, the delay memory is divided into an upper bit and a lower bit, wherein the upper bit is allocated to a memory area for delaying the AMR packet signal by a second time, and the lower bit assigns the AMR packet signal to a first time. It is characterized in that the allocation to the memory area for delay.

Also preferably, the delay logic unit may simultaneously write and read the AMR packet signal to the delay memory by dividing an upper bit and a lower bit of the delay memory using an enable signal.

Further, preferably, the delay logic unit applies an AMR packet signal delayed by a first time to the time alignment controller using a lower bit of the delay memory according to the synchronization signal received through the time alignment controller. And re-receive the AMR packet signal delayed by the first time and apply the AMR packet signal delayed by the second time to the time alignment control unit by using an upper bit of the delay memory. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 4, the time alignment unit of the vocoder device in the IWU of the MSC according to an embodiment of the present invention controls the upper MP received from the time alignment controller after receiving the encoded AMR packet signal from the transcoder without delay. One delay logic unit 40 and one delay memory 50 are provided for a channel in which call setup is made through information, a synchronization signal, and a clock signal.

Here, by setting the write position and the read position differently in the delay memory 50 for implementing the time alignment function, one delay memory 50 is used without having to use two double buffer structures as in the prior art. The upper bit of the delay memory 50 is allocated to the memory area for the 40 (ms) delay and the lower bit is allocated to the memory area for the 20 (ms) delay. The delay logic unit 40 is configured to simultaneously write and read the corresponding delay memory 50 using an enable signal for distinguishing the upper bit and the lower bit.

In addition, the delay logic unit 40 receives the AMR packet voice data from the transcoder and based on the 20 (ms) frame synchronization signal received through the time alignment controller, the upper and lower bits of the delay memory 50. 20 (ms) and 40 (ms) delayed AMR packet voice data respectively allocated to is applied to the time alignment controller.

In other words, the delay logic unit 40 stores the AMR packet voice data delayed by 20 (ms) using the lower bits of the delay memory 50 according to the 20 (ms) frame synchronization signal received through the time alignment controller. The AMR packet speech data delayed by 40 (ms) using the upper bits of the delay memory 50 by re-receiving the 20 (ms) delayed AMR packet speech data while being applied to the time alignment controller. Authorize by.

Operation of the time alignment unit of the vocoder device in the IWU of the MSC according to the embodiment of the present invention is as follows.

It converts the PCM data decoded through the vocoder device in the IWU and encodes the data in the reverse direction to transmit voice data for the call. It is transmitted in synchronization with a synchronization signal received by the traffic pool device.

Accordingly, the traffic pool device transmits the PCM voice data received from the vocoder device to the E1 / N0.7 interface device, which is a trunk and No.7 signal link processing device for PSTN matching, by call control data received from a control device. Let it be.

On the contrary, in the vocoder device, a synchronization signal applied from the traffic pool device to encode PCM data of the general subscriber and the additional service device linked to the voice traffic pool and the voice data received through the matching device in the PSTN into packet voice data. The PCM data and voice data are received accordingly.

Accordingly, the vocoder device transmits PCM voice data received with the synchronization signal from the traffic pool device to the transcoder along with the synchronization clock received from the reference control unit.

Accordingly, the transcoder converts the channel-configured packet voice data of the AMR up-frame structure without delay into the time alignment unit according to the call information received through the time alignment controller.

Then, after receiving the AMR packet voice data from the transcoder in the time alignment unit, as shown in FIG. 4, the delay logic unit 40 receives the 20 (ms) frame synchronization signal received through the time alignment control unit. Based on the AMR packet speech data allocated to the upper and lower bits of the delay memory 50, respectively, is applied to the time alignment controller.

Accordingly, the time alignment control unit selects a desired AMR packet signal from the upper MP from among the AMR packet voice data applied from the time alignment unit, and transmits it to the ATM processor in accordance with the synchronization control signal generated by the reference processor.

And, the ATM processing apparatus completes the traffic transmission by the IWU call processing by mapping the packet voice data received in synchronization with the synchronization signal transmitted from the corresponding board to the ATM cell payload and transmitting it to the higher MSC system. . At this time, the additional control according to the call processing for each section is achieved by matching each device linked to the control device using call control information.

As described above, in the control of the memory for implementing the time alignment function of the vocoder device in the IWU which is the CN component of the 3GPP system, the time alignment function is implemented using one delay logic unit and one delay memory. By implementing, it is possible to reduce the complexity of implementing the time alignment function and to reduce the number of memories, thereby improving the space constraints of the vocoder device and reducing the cost.

Claims (4)

After receiving the encoded AMR packet signal from the transcoder without delay in the vocoder device in the interworking unit (IWU) of the mobile switching center (MSC), the control information, synchronization signal, and clock signal of the upper MP received from the time alignment controller A delay memory for delaying a corresponding AMR packet signal by a first time and a second time to implement time alignment with respect to a channel for which call setup is made through the UE; MS delayed vocoder comprising one delay logic unit for applying the AMR packet signal delayed by the first and second time allocated to the delay memory to the time alignment controller based on the synchronization signal. The time alignment of the device. The method of claim 1, The delay memory is divided into an upper bit and a lower bit, and the upper bit is allocated to a memory area for delaying the AMR packet signal by a second time, and the lower bit is used to delay the AMR packet signal by a first time. And a time alignment unit of MS Vocoder device in iU. The method of claim 1, The delay logic unit may simultaneously write and read the AMR packet signal to the delay memory by dividing an upper bit and a lower bit of the delay memory using an enable signal. Alignment section. The method of claim 1, The delay logic unit applies an AMR packet signal delayed by a first time to the time alignment control unit by using a lower bit of the delay memory according to a synchronization signal received through the time alignment control unit, and at the same time as the first time. The time alignment unit of MSC's I / O vocoder device, wherein the delayed AMR packet signal is re-received and the AMR packet signal delayed by a second time is applied to the time alignment control unit by using the upper bits of the delay memory. .