KR20010019950A - Interface method between control part of DSP in base control station of communication system - Google Patents

Abstract

PURPOSE: An interfacing method between a DSP and a control part at a control station in a communication system is provided to perform a high-speed data service by carrying out a parallel-interface between a DSP and a control part at a vocoding block using a sub-offset without a configuration change of the vocoding block. CONSTITUTION: In an interfacing method between a DSP and a control part at a control station, the DSP is initialized by an initialization commend of the control part transferred with a receiving/transmitting offset. The DSP is synchronized by a synchronization interrupt from the control part. An input/output counter is set as 0 with the receiving/transmitting offset and an ISLP is performed. The ISLP is terminated in the DSP and a parallel-interface is performed before the operation unit time reaches 20ms according to the operation of the input/output counter. In case that data is transmitted from the control part to the DSP depending on the parallel-interface, a data receiving commend is provided to the DSP prior to the receiving offset. In case that data is received from the DSP to the control part, data transmitting commend is provided to the DSP within 20ms after the transmitting offset. In case that data is transmitted from the control part depending on the transmitting/receiving commends, datum are divided to load in a commend packet through a sub-offset and are transmitted twice to the DSP. In case that data is received, datum divided to load in the response packet of DSP through the sub-offset are received twice.

Description

Interface method between control part in DSP and base station of communication system {Interface method between control part of DSP in base control station of communication system}

The present invention relates to a vocoding block for processing a voice signal in a control station of a communication system to which a code division multiple access (CDMA) scheme is applied, using a sub-offset controller and a digital signal processor. Digital Signal Processor (hereinafter referred to as 'DSP') relates to an interface method between a control station in a control station and a DSP of a communication system to provide a high-speed data service by performing a parallel interface.

In the control station vocoding block of the CDMA communication system specified in the conventional TIA / EIA IS-95A, a control unit and a DSP are connected through a parallel interface to exchange voice signals or data in the form of packets, where 22 bytes or 32 Communicate at 8Kbps or 13Kbps with bytes in one packet.

In addition, the DSP in the vocoding block is connected to a serial interface with an exchange to communicate a 160-byte PCM-type voice signal or data at a rate of 64 Kbps, wherein the actual voice signal or data of the PCM signal between the DSP and the exchange is 22 bytes ( 8 Kbps) or 32 bytes (12 Kbps), and in the case of data, various kinds of information necessary for communication are added as a header and transmitted to the switching center.

The DSP performs ISLP (InterSystem Link Protocol) with 22 bytes or 32 bytes of data, and when 2 MHz clock is used for serial interface with switching center, 1 byte per 125 ms is used for input / output. In this case, ISLP performs compression / restore of voice signal or rate adaptation of data within 20 ms by storing 160 bytes in buffer.

On the other hand, the parallel interface between the control unit and the DSP is one packet input / output within 20 ms, and receives a command from the control unit about the work to be performed by the DSP and performs the work corresponding to the command through the vocoding algorithm in the DSP. .

In this case, the vocoding algorithm in the DSP is divided into a voice signal processor and a data processor to receive a voice processing command and a data processing command, respectively, and perform a corresponding task.

However, in recent years, when a high-speed data service is required as in the TIA / EIA IS-95B, it is difficult to use the parallel interface method of the conventional TIA / EIA IS-95A between the control unit and the DSP in the vocoding block. In particular, there is a problem that it is difficult to use in a system that requires high-speed data processing, such as IMT-2000 system.

In addition, in the conventional TIA / EIA IS-95A, the controller of the vocoding block needs to determine commands for the DSP to perform two times each when processing the voice signal and when processing the data. There were many disadvantages.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to use a sub offset in a vocoding block for processing a voice signal in a control station of a communication system employing a CDMA scheme without changing the hardware configuration of the vocoding block. Accordingly, the present invention provides a method for interfacing between a control unit and a DSP in a control station of a communication system to provide a high-speed data service by performing a parallel interface between a control unit and a DSP in a vocoding block.

1 is a block diagram of a vocoding block in a control station of a general communication system;

2 is a flowchart illustrating an interface method between a control unit in a control station and a DSP of a communication system according to the present invention;

<Description of the code | symbol about the principal part of drawing>

1: control unit 2: memory

3: DSP 4: Interface

In order to achieve the above object, an interface method between a controller in a control station and a DSP in the communication system of the present invention initializes the DSP by the initialization command of the controller transmitted together with the transmission / reception offset, and synchronizes the DSP by the synchronization interrupt of the controller. DSP sets input / output counter to 0 according to transmit / receive offset, finishes ISLP within 20ms, and executes parallel interface.In case of sending data from DSP to DSP, control command is sent to DSP before receive offset. When the control unit receives data from the DSP, the data transmission command is transmitted to the DSP within 20 ms after the transmission offset. Then, in the case of data transmission from the control unit according to the transmission / reception command, the data is loaded in the command packet and transmitted to the DSP. In case of receiving, it receives data loaded in DSP's response packet. It characterized that allows to increase the speed of transmission data by dividing the data packet transmission and reception using the transmission and reception sub-offset each twice.

Hereinafter, with reference to the accompanying drawings will be described in detail the interface method between the control station in the control station and the DSP of the communication system according to the present invention.

1 is a block diagram of a vocoding block in a control station of a general communication system. The control unit 1 generates a U1 frame and uses a sub-offset to give a voice signal or a data transmission command twice to a DSP. ), A memory (2) for storing data necessary for the operation of each unit or temporarily generating data, and compresses / restores a voice signal or introduces the concept of SDU, PDU, ISLP, U1 frame. It is composed of a DSP 3 serving as a service and an interface unit 4 for organically performing the operations of each unit.

The above configuration is a configuration of a vocoding block located in a control station of a communication system to which the CDMA system, which consists of an exchange station, a control station, a base station, and a terminal station, is operated in such a configuration. The interface method between 1) and the DSP 3 is a technique in which a data processing algorithm is incorporated into a speech signal processing algorithm used in a conventional vocoding block.

The vocoding block configured as described above has the same configuration as a conventional vocoding block, i.e., when using 2 MHz as a clock for a serial interface, 4 ms of time is required to send and receive 1 byte, and 8 MHz In the case of using, since each time of 1 ms is required to send and receive 1 byte, the voice signal or data must be processed within 117 ms or 123 ms.

Accordingly, the DSP 3 has an instruction cycle time of 25 s or more, and is implemented as a 16-bit or higher DSP having a parallel / serial interface, thus the vocoding block defined in the conventional TIA / EIA IS-95B. Will be available as is.

The sub-offset used by the controller 1 is set to 125 dB × N (N = integer) because the PCM signal is input / output every 125 ms.

In the present invention, in the vocoding algorithm in the DSP 3, a flag concept is introduced to reduce the load of the controller 1 so as to determine whether to perform voice signal processing or data processing. do.

That is, the vocoding algorithm in the DSP 3 is also divided into a voice signal processing unit and a data processing unit separately as in the prior art, and separately performed, and an ID byte for distinguishing a voice call and a data call is added to a packet for a parallel interface. Add a search module to retrieve the flags for the serial interface.

The interface method between the control unit 1 and the DSP 3 in the vocoding block in the control station according to the present invention configured as described above will be described with reference to the operation flowchart of FIG.

First, the controller 1 transmits a command for initializing the DSP 3 to the DSP 3 together with the transmission and reception offset so that the DSP 3 performs the initialization (S1).

Subsequently, the controller 1 transmits an interrupt for synchronizing the DSP 3 to the DSP 3 so as to match the entire network, so that the DSP 3 can synchronize the entire synchronization (S2).

After performing step S2, the DSP 3 sets an input / output counter to 0 in accordance with the transmission / reception offset and performs an ISLP (S3).

At this time, the input / output counter is incremented by 1 each time the serial input / output is performed, so that when it is exactly 159, it becomes 20 ms.

Within 20 ms, the DSP 3 finishes the ISLP and performs a parallel interface (S4).

Thereafter, since the control unit 1 knows the transmission / reception offset from the interrupt, when the control unit 1 transmits data to the DSP 3, the control unit 1 gives a data reception command to the DSP 3 before the reception offset, and the control unit 1 When data is received from the DSP 3 in step S5, a data transmission command is given to the DSP 3 within 20 ms after the transmission offset (S5).

In the case of data transmission from the control unit 1 according to the transmission / reception command of step S5, the data is loaded into the command packet and transmitted to the DSP 3, and in the case of data reception, the data carried in the response packet of the DSP 3 is received. To receive (S6).

In this case, when the transmission and reception data packets are divided and transmitted twice using the sub offset, the transmission data speed can be increased.

On the other hand, since the vocoding algorithm performed by the DSP 3 generates more voice calls than the data calls, the conventional voice signal processing algorithm is first performed as the basic algorithm, and then the data processing algorithm is performed.

That is, when the vocoding algorithm in the DSP 3 is divided into the voice signal processing section and the data processing section separately, the parallel interface side adds a new ID byte for distinguishing the voice call or data call to the packet, and the serial interface side uses the conventional method. In the case where the search module is added to the input / output buffer and the search for the flag (0x7e) is continued, the DSP 3 operates as a data processing algorithm.

When the data call is determined through the search module for searching the ID byte or the flag byte as described above, the DSP 3 discards flags of the PDU data received from the switching center and performs ISLP with the remaining data to control the controller 1. In the case of data received from the control unit 1 or by searching for the ID byte, if the data processing algorithm is determined, ISLP is performed and a flag is transmitted to the DSP 3.

As described above, the present invention is a technology used for voice service and data service using DSP technology in a communication system to which the CDMA method is applied, and can be used for a conventional voice service of TIA / EIA IS-95A, and TIA / EIA IS-95B. It can be used for high speed data service required by.

In addition, it can be used for packet mode data services (Mobile to Internet, Internet to Mobile), asynchronous data services (Mobile to PSTN modem, PSTN modem to Mobile, Mobile to Mobile) and digital G3 FAX service (Mobile to PSTN FAX). , PSTN FAX to Mobile, Mobile to Mobile).

As described above, in the present invention, the TIA / EIA IS- is performed by performing a parallel interface between the control unit and the DSP by using a sub offset while leaving the hardware configuration of the vocoding block in the control station used in the TIA / EIA IS-95A intact. The high speed data service required by 95B can be provided, and the load of the controller can be reduced by introducing a flag concept when performing a parallel interface to perform a voice signal or data processing. .

Claims (3)

A control unit that controls the operation of the DSP, such as generating a U1 frame and giving a voice signal or a data transmission command to the DSP twice using a sub offset, and a memory for storing data necessary for the operation of each unit or temporarily generating data. And a DSP that performs a role of compressing and restoring a voice signal or adopts the concept of SDU, PDU, ISLP, U1 frame, and performs a data service role, and an interface unit for performing the operations of each unit organically. In the interface method between the control unit and the DSP performed in the coding block, A first step of initializing the DSP by an initialization command of the control unit transmitted together with the transmission / reception offset; and a second step of synchronizing the DSP to the entire synchronization by the synchronization interrupt of the control unit transmitted to match the entire network after performing the first step; A third step of setting an input / output counter to 0 according to the transmission / reception offset of the first step and performing an ISLP after performing the second step; and operation of the input / output counter of the third step The fourth step of performing the parallel interface after completing the ISLP in the DSP before the operation unit time according to the operation time is 20 ms, and the data before the reception offset when the control unit transmits data to the DSP according to the parallel interface of the fourth step If a receive command is sent to the DSP and the control unit receives data from the DSP, the data send command is sent to the DSP within 20 ms after the transmit offset. According to the fifth step and the transmission / reception command of the fifth step, the controller transmits the data twice in the command packet through the sub-offset and transmits the data twice to the DSP through the sub-offset. And a sixth step of receiving the data carried in the packet twice. 2. The interface method according to claim 1, wherein the sub-offset is 125 dB × N (N = integer) because a PCM signal is input / output every 125 ms. The method of claim 1, wherein when the vocoding algorithm executed by the DSP is divided into a voice signal processing unit and a data processing unit, and executed separately, the parallel interface side adds an ID byte for distinguishing a voice call or a data call to a packet, and serial interface. When the processor adds a search module to the conventional method and continuously searches for input / output buffers to find a flag (0x7e), the DSP operates as a data processing algorithm to search for the ID byte or the flag byte. If the call is determined, the DSP discards Flags of the PDU data received from the switching center and performs the ISLP with the remaining data to transmit the data to the control unit, or, in the case of the data received from the control unit, retrieves the ID byte and performs a data processing algorithm. Once this is determined, we will perform an ISLP and flag it An interface method between a control unit in a control station and a DSP of a communication system, characterized by transmitting to a DSP.