KR20020093505A - Cdma system - Google Patents

Abstract

PURPOSE: A CDMA system is provided to couple non-voice data with a digital packet when transmitting voice data between a CDMA base station and a CDMA terminal as the digital packet, and to transmit and separate the coupled data, then to quickly calculate a position of the moving CDMA terminal, thereby easily calculating a position of a user of the CDMA terminal. CONSTITUTION: A call processor(600) performs a CDMA call processing procedure for data communication in a CDMA traffic channel, and performs service negotiations through call access. When a call starts, a separator(205) separates a CDMA traffic packet received through a CDMA wireless modem(100) of a CDMA base station system via a traffic transmitter(400). A voice data packet is outputted to an encoder/decoder(200). A non-voice data packet is outputted to the call processor(600). The call processor(600) outputs non-voice data to be transmitted through the CDMA wireless modem(100). A GPS receiver(500) extracts system time of a GPS satellite for synchronization necessary to communication between the wireless modem(100) and a wireless modem(13) of a CDMA terminal system, and outputs GPS satellite information to the call processor(600).

Description

CDM system {CDMA system}

The present invention relates to a CDMA system consisting of a CDMA terminal and a CDMA base station, wherein the voice data of the CDMA base station and the CDMA terminal period are transmitted and separated by combining and transmitting non-voice data together in a digital packet. It relates to a CDMA system that can be calculated easily.

A CDMA system for wireless communication using a code division multiple access method (hereinafter referred to as CDMA) includes a CDMA terminal and a CDMA base station. The CDMA system transmits and receives data through a digital packet through a wireless link, and is divided into a paging channel and an access channel for sending and receiving control messages and a traffic channel for sending and receiving data according to functions. Through such a CDMA system, a user can receive a data service which is a voice service and a non-voice service. In the case of the voice service, the analog voice signal is transmitted by compressing the PCM data, which is a digital voice signal made through a sampling and quantization process, using a voice / decoder. In addition, in case of non-voice service, it provides interworking with IWF (inter-working system) defined in international standard IS-707. TCP / IP / PPP protocol is used for data communication between CDMA terminal and base station's IWF system. In the case of non-voice services, the location information guidance service needs to calculate the location of the mobile terminal user, which includes a terminal approach and a network approach. The terminal approach used is often used.

In addition, U.S. Patent No. 5,781, l56 discloses the location of a CDMA terminal that connects a GPS terminal to a CDMA terminal, connects a GPS server to a GPS receiver installed at a fixed location on the ground, and then connects the two to each other through a modem of an IWF system. A method of calculating is disclosed. Recently, a new international communication standard, IS-8Ol, has been proposed to enable the exchange of messages between a GPS terminal and a GPS server without using an IWF system.

However, in this CDMA system, since there is no CDMA communication standard that simultaneously supports the voice part / decoder for voice service and the TCP / IP / PPP protocol for non-voice service, there is a problem that the voice service cannot be received at the same time. . In addition, the location information guide service in the non-voice service has a problem that the traffic failure may occur because the message delivery and processing speed is slow even when using the conventional GPS satellite system.

Accordingly, an object of the present invention is to provide a CDMA system capable of combining and separating voice messages and non-voice messages to solve the above-mentioned problems, and to perform location calculation of a CDMA terminal more quickly.

1 is a block diagram showing a CDMA system for explaining an embodiment of the present invention;

2 is a view showing an input / output data packet of the synthesizer of FIG.

3 is a view illustrating an input / output data packet of the separator of FIG. 1;

4 is a flowchart illustrating a traffic packet separation process of the FIG. 1 separator;

5A is a diagram illustrating a non-voice message processing process when the device is in a normal connection state;

5B is a diagram illustrating a non-voice message processing process when the device is in an emergency connection state;

6 is a block diagram showing a CDMA system for explaining another embodiment of the present invention.

FIG. 7A is a diagram illustrating a processing process when a device makes a terminal call for a location calculation service; FIG.

FIG. 7B is a diagram illustrating a process of processing an incoming call to a terminal for a location calculation service by FIG. 6;

8 is a block diagram illustrating a CDMA system for explaining another embodiment of the present invention.

Rock too.

9 is a block diagram showing a CDMA system for explaining another embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

l 0: ADC 11: DAC

l2, 200: code / decoder 13, 100: CDMA wireless modem

300: MSC (mobile service controller)

The CDMA system according to the present invention for achieving the above object is to transmit and receive a GPS satellite system, a single data synthesized voice and non-voice data to synthesize and separate the single data, and to calculate the distance estimation value from the GPS satellite system CDMA terminal system for transmitting together with the non-voice data, CDMA terminal system to transmit and receive a single data to synthesize and separate the single data, the satellite information received from the GPS satellite system and the CDMA terminal system from the distance estimation value from the CDMA terminal system It includes a CDMA base station system for calculating the current position information of and transmits it with the non-voice data to the CDMA terminal system.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating a CDMA system for explaining an embodiment of the present invention.

The apparatus is divided into a CDMA terminal system and a CDMA base station system. The CDMA terminal system includes an ADC (10) for receiving a voice signal and converting it into a digital signal, a DAC (ll) for converting an analog signal for outputting a voice signal, a code / decoder (l2), and a CDMA radio for transmitting and receiving a wireless signal. Modem l3 is included.

Here, the code / decoder l2 is a compressor 124 for compressing the voice PCM data input from the ADC 10, a player l25 for reproducing the PCM data in the reverse process, and the voice data and the non-voice data. A synthesizer (l26) for synthesizing a data packet from a synthesized packet, a separator (127) for separating a voice data packet and a non-voice data packet from the synthesized packet, a GPS processor (l22) for processing data necessary for position calculation, and a CDMA base station system. A packet processor l23 for transmitting a GPS message and delivering the received GPS message to the GPS processor l22, and a controller 121 for adjusting the compression ratio of the compressor l24 in response to a request of the packet processor l23. . On the other hand, the CDMA base station system includes a CDMA wireless modem 100 / decoder 200 and an MSC 300. The code / decoder 200 of the CDMA base station system includes the same configuration as that of the code / decoder l2 of the CDMA terminal system, but instead of the GPS processor l22 of the code / decoder l2 of the CDMA terminal system. It includes a GPS calculator 20l. The same operation is performed for the same configuration in the code / decoders 12 and 200 of each of the CDMA terminal system and the CDMA base station system.

The operation of the CDMA system of the present invention configured as described above will be described in detail with reference to FIGS.

Figure 2 shows the input and output data packets of the synthesizer of Figure 1 apparatus. Here, for the convenience of description, it will be described as the synthesizer l26 of the CDMA terminal system among the synthesizers l26 and 204 of the apparatus of FIG. 1.

The compressor 124 receives PCM data, which is a digital voice signal, from the ADC 10 and compresses the compression rate according to the control of the controller l2l to output the synthesizer l26. The synthesizer l26 receives the compressed voice data from the compressor 124 and the non-voice data from the packet processor 123 and synthesizes the synthesized voice into one CDMA traffic packet. The output packet of the packet processor l23 is divided into a data area and a frame check sequence (FCS) area. Here, the FCS area is for detecting the boundary between the voice message and the non-voice message with the purpose of detecting an error or the like occurring on the data area.

Let the length of the CDMA traffic packet synthesized the non-voice data from the packet processor l23 and the voice coefficient which is the output data of the compressor l24 be L bits. In addition, it is assumed that the length of the output data of the compressor l24 is Lv bit, the length of the output data of the packet processor l23 is Ld bit, and the length of the FCS is n bit. Then, the length Lp of the data area that the packet processor l23 can use for the non-voice message is Ld-n, that is, L-Lv-n. Here, the length L of the CDMA traffic packet always maintains a constant length, so the space available for sending non-voice messages depends on the compression ratio of the compressor l24. If the compression rate is high, the amount of voice data generated is small, so the space used for non-voice messages increases, and when the compression rate is low, the space for sending non-voice messages decreases. That is, while a person speaks, the amount of generation of voice data increases, so that the compression rate is low. When the person is listening to the other person, only the background noise is present, so that a high compression rate can be obtained. Therefore, by adjusting the compression rate to reduce the amount of voice data generated it is possible to secure a space for non-voice messages.

3 is a view illustrating input and output data packets of the separator of FIG. 3 illustrates a process of separating a voice message and a non-voice message by receiving a CDMA traffic packet as opposed to the case described with reference to FIG. 2. The separator 127 of the CDMA terminal system receives a CDMA traffic packet having a length of L bits and detects an FCS. When the FCS is detected, the non-voice data which is the data before the FCS is output to the packet processor 123, and the voice data which is the data after the FCS is output to the player 125. However, if the FCS is not detected, it is determined that the voice message is a pure voice message having no non-voice message, and is output only to the player 125.

The separation process of the CDMA traffic packet of the separator will be described in more detail with reference to the flowchart of FIG. 4.

First, when a CDMA traffic packet is input, a buffer (not shown) and variables are initialized in the separator (step 401), and an FCS value storage variable is also initialized (step 402). Then, the data of the CDMA traffic packet is read (step 40). If the data is read, it is determined whether it is the last data. If the data is the last data, step 411 is performed. If not, the FCS value is calculated (step 405). Then, it is determined whether the FCS value is the expected value (step 405). If the result is not the expected value, the data is stored in the temporary buffer and the flow returns to step 403. If the determination result is the expected value, the recognized non-voice data is output to the packet processor 123 (step 408). after that. It is determined once again whether it is the last data (step 409), and if it is not the last data, the remaining data is output to the player l25 (410). On the other hand, if it is the last data, silent data is generated and output to the player (step 4ll). Finally, the player processes the voice data, which is the remaining data input in step 410, and the silent data input in step 411, to reproduce the voice signal (step 4112). In this case, the silent data is the background noise generated when the audio data is reproduced. The audio data is basic voice data that is randomly generated by the receiver when no voice data is inserted in order to use the entire CDMA traffic packet for non-voice message transmission.

Next, an operation in which the packet processor 123, the synthesizer 126, the controller 121, the compressor 124, and the GPS processor 122 of the apparatus of FIG. 1 transmit non-voice data will be described with reference to FIGS. 5A and 5B. Explain.

Non-speech data to be transmitted is divided into normal transmission and emergency transmission according to priority. Non-voice data processing in the case of normal transmission will be described with reference to FIG. 5A, and non-voice data processing in the case of emergency transmission is shown in FIG. 5B. It demonstrates with reference to.

First, referring to FIG. 5A, if there is non-voice data to be transmitted by the GPS processor l22, the length M bits and the priority P of the non-voice data are designated and transmitted to the packet processor 123 (step 1). When the priority level is low, the packet processor l23 outputs a signal to the controller l2l indicating that there is a transmission message (step 2). If the priority is high, it will be described below with reference to FIG. 5B. Then, the controller l2l designates and transmits the compression ratio r-min to the compressor l24 (step 3). The compressor l24 receives the PCM data (step 4), extracts the voice coefficient having the Lv bit length, and outputs it to the synthesizer 126 (step 5). The synthesizer 126 calculates the transmission space of the non-voice data by referring to the length Lv of the voice data input from the compressor 124 and outputs the value Lp to the packet processor l23 (step 6).

The packet processor l23 outputs the (Ld-n) bit and the FCS value to the synthesizer excluding only n bits of the FCS length in the message to be transmitted (step 7). The synthesizer l26 uses a CDMA wireless modem (CDMA wireless modem) to synthesize a CDMA traffic packet obtained by synthesizing the voice coefficient of the voice data input from the compressor l24 and the non-voice data having the Ld bit length input from the packet processor l23 as described in FIG. l3) (step 8). This penalty is repeated until the packet processor 123 has no data (step 9). When data transmission is completed, the packet processor l23 informs the GPS processor l22 and the controller l2l (steps l0 and ll). Then, the controller 121 outputs an initial value setting control signal to the compressor 12 for setting the predetermined compression ratio to an initial value (step 12).

Next, referring to FIG. 5B, the same process as steps 1 and 2 of FIG. 5A is performed. In this case, the packet processor l23 controls the synthesizer 126 to transmit only non-voice data when the priority is high (step 3). . The following steps 4 to 10 are as described with reference to FIG. 5A. When the non-voice data transmission is completed in this way, the packet processor 123 notifies the synthesizer 126 of resuming transmission of the voice data (step ll). In this case, since the voice message is not sent at all, only the background noise is heard on the other side, and the subscriber does not recognize the time when the voice is not heard because the length of the non-voice data is not large. Through this process, since the data can be exchanged between the GPS processor 122 of the CDMA terminal system and the GPS calculator 20l of the CDMA base station system, the position of the CDMA terminal is calculated. In addition, since the voice data and the non-voice data can be transmitted at the same time, the position can be calculated simultaneously with the voice call.

6 is a block diagram illustrating a CDMA system for explaining another embodiment of the present invention.

In the apparatus of Fig. 6, the CDMA terminal system connects the GPS rangefinder 14 to the code / decoder 1 of Fig. 1. The CDMA base station system further includes a call processor 600 for controlling the GPS receiver 500 and the GPS receiver 500 and providing satellite information, and between the CDMA wireless modem 100 and the code / decoder 200. A traffic transmitter 400 is provided. Also, the location information database server 700 and the database 800 are connected to the MSC 300.

In the configuration of the apparatus of FIG. 6, the same operation is performed for the components having the same reference numerals as the apparatus of FIG. 1, and therefore, the operation will be described based on the new configurations.

The call processor 600 of FIG. 6 performs a CDMA call processing procedure for allocating a terminal user for data communication on a CDMA traffic channel. The call processor 600 performs a service negotiation to secure resources of the system by making a call connection to provide various types of services. When the call is started in this way, the CDMA traffic packet received through the CDMA wireless modem l00 of the CDMA base station system is separated from the separator 205 via the traffic transmitter 400 to decode the voice data packet to the code / decoder 200. Will be printed). In addition, the non-voice data packet is output to the call processor 600, and the non-voice data to be transmitted by the call processor 600 is output through the CDMA wireless modem (l00). The GPS receiver 500 extracts the system time of the GPS satellites for synchronization necessary for the communication between the radio modem l00 of the CDMA base station system and the radio modem l3 of the CDMA terminal system, and uses the GPS to the call processor 600. Output satellite information.

FIG. 7A is a diagram illustrating a process of processing a terminal call signal for a location calculation service by the apparatus of FIG. 6.

When the user requests the location service (step 1), the call processor (not shown) of the CDMA terminal system starts service negotiation (step 2). When the service negotiation is completed, the GPS processor 122 and the GPS rangefinder 14 are initialized (steps 3 and 4). On the other hand, the call processor 600 of the CDMA base station requests the satellite information to the GPS receiver 500 when the service negotiation is terminated (step 5). then . The GPS receiver 500 informs the call processor 600 of the information of the GPS satellites located within the current visible distance (step 6), and the call processor 600 outputs the information of the GPS satellites to the GPS calculator 201 (step). 7). The call processor of the CDMA terminal initializes the GPS processor 122 and the GPS rangefinder 14, and the GPS rangefinder 14 calculates the distance estimation value (step 8). The GPS range finder l4 outputs the distance estimate to the GPS processor 122 (step 9), and the GPS processor l22 outputs the distance estimate to the GPS calculator 20l of the CDMA base station system (step 10). The GPS calculator 20l calculates the position of the CDMA terminal using the distance estimation value and the satellite information input from the GPS receiver 500 and transmits the location information to the GPS processor 122 and the location information database server 700 (step ll). , l3). The GPS processor l22 outputs location information to a call processor (not shown) of the terminal so that the user can check it.

FIG. 7B is a diagram illustrating a process of processing an incoming call of a terminal for a location calculation service by the apparatus of FIG. 6. The call processor 600 of the CDMA base station receives the call request (step l). Then, a call connection is requested to the call processor of the terminal (step 2). The call processor of the terminal negotiates the service according to the call reception request (step 3). The process after the service negotiation is completed is the same as the process described with reference to FIG. 7A.

8 is a block diagram illustrating a CDMA system for explaining another embodiment of the present invention.

It's Rock Road. Fig. 8 is a block diagram required when message communication between the GPS range finder l4 of the CDMA terminal system and the GPS calculator 201 of the CDMA base station system is made through a control channel rather than a traffic channel. When the CDMA traffic channel is not used, a synthesizer, a separator, and a controller are not used, and only a packet processor 123 and a GPS calculator 201 are used. The traffic transmitter 400 distinguishes the one sent by the GPS rangefinder l4 from the control channel coming into the base station through the CDMA wireless modem l00, and outputs it to the GPS calculator 201 and, conversely, the GPS calculator 201 to transmit. Data is output to the CDMA wireless modem 100 in the control channel. The transmission of the GPS calculator 201 among the control channel data received through the CDMA wireless modem l3 of the CDMA terminal is output to the GPS rangefinder l4 through the packet processor 123. As such, when GPS-related data is transmitted through a control channel instead of a traffic channel, voice calls can be simultaneously performed.

9 is a block diagram of a CDMA system for explaining another embodiment of the present invention.

9 connects the synthesizer 204, the separator 205, the traffic processor 202, and the GPS calculator 201 with the traffic transmitter 400 so as to transmit and receive data in a CDMA base station system. . Therefore, the path between the CDMA base station system, the GPS processor 122 of the CDMA terminal system, and the GPS rangefinder 14 can be shortened, so that the delivery path of packet information necessary for position calculation can be shortened.

As such, when the present invention can transmit voice data and non-voice data at the same time

In addition to the voice call, the position of the CDMA terminal can be calculated.

Claims (17)

In a CDMA system, GPS satellite system; Send and receive single data that combines voice and non-voice data A CDMA terminal system for synthesizing and separating, calculating a distance estimation value from the GPS satellite system, and transmitting the same together with the non-voice data; Synthesize and separate single data by transmitting and receiving single data with the CDMA terminal system And a CDMA base station system for calculating the current position information of the CDMA terminal system from the satellite information received from the GPS satellite system and the distance estimation value from the CDMA terminal system and transmitting the non-voice data to the CDMA terminal system. CDMA system. The method of claim 1, wherein the CDMA terminal system A CDMA wireless modem capable of wireless communication; An A / D converter for receiving an analog voice signal and converting the same into digital voice data; A GPS range finder for calculating a distance estimation value from the GPS satellite system; Receives and encodes digital voice data from the A / D converter, and the CDMA A code / decoder for decoding coded voice data input from a wireless modem and synthesizing and separating the distance estimation value from the GPS rangefinder with the voice data as non-voice data; And A CDMA system including a D / A converter for converting decoded digital voice data into an analog signal and outputting voice. 3. The apparatus of claim 2, wherein the code / decoder is Compressing the digital voice data inputted from the A / D converter Compressor output; A player for reproducing digital voice data through a reverse process of the compression process; A GPS processor for processing and outputting a distance estimation value from the GPS rangefinder; A packet processor configured to output distance estimation values input from the GPS processor as non-voice data; A synthesizer for synthesizing the voice data and the non-voice data into single data and outputting the single data to the CDMA wireless modem; A separator for separating single data input from the CDMA wireless modem into voice data and non-voice data and outputting the same to the player and the packet processor, respectively; And And a controller that controls each of the components and adjusts the compression ratio of the compressor. The method of claim 3, wherein the single data is A CDMA system, characterized in that the CDMA traffic packet. The method of claim 4, wherein the CDMA traffic packet Sum non-voice data in data area and FCS area and voice data in voice coefficient CDMA system characterized in that. The method of claim 5, wherein the FCS region is Characterized in that it is data for detecting a boundary between voice data and non-voice data. CDMA system. The method of claim 6, wherein the separator And when the FCS region is detected, output non-voice data before FCS to the packet processor, and output voice data after FCS to the player. 7. The separator of claim 6 wherein the separator And if no FCS area is detected, determines that there is no audio data and outputs only audio data to the player. The method of claim 3, wherein the digital voice data is CDMA system, characterized in that the PCM data. 12. The system of claim 1, wherein the CDMA base station system A CDMA wireless modem capable of wireless communication; A GPS receiver for receiving and outputting satellite information from the GPS satellite system; A call processor which receives satellite information from the GPS receiver and performs call processing to transmit and receive non-voice data; Code that receives digital voice data, decodes voice code, and coded voice data input from the CDMA wireless modem, and synthesizes and separates non-voice data including satellite information from the call processor together with the voice data. Decoder; A traffic transmitter connected between the call processor and a code / decoder to transmit and receive data; And CDMA system comprising a mobile service controller (MSC). 11. The apparatus of claim 10, wherein the code / decoder A compressor for compressing digital voice data input from the MSC and outputting voice data; A player for reproducing digital voice data through a reverse process of the compression process; A GPS calculator for calculating current position information of the CDMA terminal system according to the GPS satellite information from the call processor and the distance estimation value of the GPS processor; A packet processor for outputting location information input from the GPS calculator as non-voice data; A synthesizer for synthesizing the voice data and the non-voice data into single data and outputting the single data to the CDMA wireless modem; A separator for separating single data input from the CDMA wireless modem into voice data and non-voice data and outputting the same to the player and the packet processor, respectively; And And a controller that controls each of the components and adjusts the compression ratio of the compressor. The method of claim 1, wherein the single data is A CDMA system based on the fact that it is a CDMA traffic packet. The method of claim 1, wherein the CDMA traffic packet is A CDMA system comprising a combination of non-voice data consisting of a data area and an FCS area and voice data consisting of a voice coefficient. The method of claim 1, wherein the FCS region is CDMA system, characterized in that the data for detecting the boundary between voice data and non-voice data. The method of claim 1, wherein the separator And when the FCS region is detected, output non-voice data before FCS to the packet processor, and output voice data after FCS to the player. The method of claim l4, And if no FCS area is detected, determines that there is no audio data and outputs only audio data to the player. The method of claim ll, wherein the digital voice data is CDMA system, characterized in that the PCM data.