RU2231225C2 - Method and device for transmitting information identifying calling subscriber in all system - Google Patents

Abstract

FIELD: radio communications.

SUBSTANCE: system has base station controller that functions to detect calling subscriber identifying information in modulated signal transmitted from mobile communications switching center and terminal that functions to display detected calling subscriber identifying information on screen; base station controller incorporates unit for detecting hardware warning signal residing in user's location that functions to detect hardware warning signal in call signal transferred from mobile communications switching center in call waiting state; calling subscriber identifying information detection unit that functions to detect calling subscriber identifying information in modulated data in compliance with hardware warning signal detecting signal; vocoder that functions to encode voice data transferred from mobile communications switching center; and selector used to select output signal of vocoder or calling subscriber identifying information detection unit in compliance with hardware warning signal detecting signal and to transfer this output signal to terminal through base station.

EFFECT: preventing destruction of calling subscriber identifying information by vocoder.

17 cl, 5 dwg

Description

FIELD OF THE INVENTION

The invention relates to a WML system (wireless local communication line) and, in particular, relates to an IDV transmitter (information identifying the caller) in the WML system and a method for transmitting IDV to efficiently transmit the IDV information in the WML system.

State of the art

In general, the BML system (wireless local communication system) is a technology that provides subscribers with wireless subscriber lines and has characteristics similar to those of a mobile communication network when using the radio channel as a medium for maintaining communication. In addition, the BML system, while not being a mobile communication system, has better radio wave propagation conditions than a mobile communication network.

In particular, the BML system allows you to install the antenna at a higher location, such as the roof of the building, providing transmission within line of sight, which reduces losses on the propagation path of radio waves, which are about 20 dB / decade. Consequently, the WML system allows you to cover a wider service area at the same transmit power. In addition, the BML system implements point-to-point (direct) communication, reducing the effect of "fading" arising from the multipath propagation used in the point-to-mobile station communication network. In addition, the fixed-line wireless communication network is used in the BML system, which eliminates “hand-off” of communication channels.

Figure 1 presents a diagram of a conventional communication network, including a WML system.

The conventional communications network depicted in FIG. 1 includes a mobile communications switching center (CCM) 200 outgoing messages relaying a subscriber IDV (Caller ID) using a wired terminal 100 through a public switched telephone network (PSTN); CCMS 300 incoming messages, relay IDV transmitted from the outgoing CCMS 200; BML 400 system encoding IDV, which was transmitted from the CCMS 300 incoming messages; and a BML terminal 500, which displays on the screen IDV, which was transmitted from the BML 400 system.

The BML 400 system includes KBS 40 (base station controller) and BS 41 base station. The BSC 40 includes a vocoder 40-1 encoding the received speech signal and the IDV.

Below is disclosed a method of transmitting IDV in a communication network with the above structure according to the prior art.

When the calling subscriber, using the wired terminal 100, dials the telephone number, the telephone number of the calling subscriber, i.e., IDV, is transmitted to the 400 WLL system through the MSC 200, the PSTN network and the MSC 300 (S110).

The BML 400 system sends the received IDV information to the VBS 40-1 vocoder 40, and the vocoder 40-1 encodes the corresponding IDV, and then forwards the encoded IDV to the BML 500 through the BS 41. Then, the BML terminal 500 decodes the airborne transmissions transmitted from the BS 41, displaying on-screen information about the caller, for example, his phone number. Thus, the called party has the ability to control the caller.

Typically, the IDV introduced into the BML 500 system from the MSC of incoming messages 300 is a signal modulated using one of various modulation methods, such as frequency shift keying (FMN), dual-tone multi-frequency dialing (DMCH), and amplitude shift keying (AMN). IDEV information is transmitted in a pulse code modulation (PCM) signal.

Vocoder imitates the principles of speech formation, implementing coding, optimal in relation to speech. In this case, the encoding destroys the initial information about the waveform, its amplitude, phase and frequency. Therefore, when the IDV transmitted from the MSC is encoded in vocoder 40-1, the information on the waveform, amplitude, phase and frequency of the IDV is destroyed, and the BML terminal is not able to completely restore the original information on the waveform, amplitude and frequency of the IDV.

Unfortunately, the BML system cannot provide a high-quality service for identifying the caller due to the destruction of the IDV vocoder.

SUMMARY OF THE INVENTION

Accordingly, the present invention is directed to the creation of an IDV transmitter in a BML system and a method for transmitting an IDV that substantially eliminates one or a number of problems arising from the limitations and disadvantages inherent in the prior art.

An object of the present invention is to provide an IDV transmitter in a BML system and a method for transmitting an IDV to prevent the destruction of the IDV information caused by the vocoder.

Another objective of the present invention is the creation of an IDV transmitter in an LSM system and a method for transmitting an IDV, which makes it possible to detect the IDV information in the input modulated data using a processing procedure different from that of the speech signal.

Additional advantages, objects, and features of the invention are set forth in part in the following description and in part will become apparent to those skilled in the art after reviewing the following material, or may be studied by practical use of the invention. The objectives and other advantages of the invention can be realized and achieved using the design specifically presented in the description and claims, as well as in the accompanying drawings.

To achieve these goals and other advantages and in accordance with the embodied and described in detail the purpose of the invention, the IDV transmitter in the BML system according to the present invention includes: MSC, relay call signal of the subscriber; a BML system detecting IDE information (caller identification) of a subscriber from a modulated signal transmitted from a MSC; and a BML terminal displaying the detected IDV information on the screen.

According to another aspect of the present invention, the IDV transmitter in a WML system includes: an MSC relaying a subscriber call signal; PAP signal detection unit (warning signal for equipment located in the user's premises) detecting the PAP signal in the call signal; the IDV detection unit detecting the IDV information in the transmitted modeling signal when the PAP signal is detected; a vocoder that processes voice data that is transmitted from the MSC if a PAP signal is not detected; and a selector requiring the transmission of the IDE information from the MSC, if the PAP signal is detected, and transmitting the output signal of the vocoder or the IDE detection unit to the BML terminal.

According to another aspect of the present invention, a method for transmitting an IDV in a WML system includes the steps of: receiving a call signal from a MSC (mobile switching center); detection of the PAP signal in the received call signal; detecting the IDE information (caller identification) of the subscriber in a modulated signal transmitted from the MSC, if the PAP signal is detected; and display on the screen of the terminal BML detected information IDV.

It should be understood that both the foregoing general description and the following detailed description of the present invention are provided by way of example and for purposes of explanation, and are intended to further explain the invention disclosed in the claims.

Brief Description of the Drawings

The accompanying drawings, which are included here to further clarify the invention and form part of this application, show an embodiment (s) of carrying out the invention, and these drawings, together with a description, serve to explain the principle of the invention.

In the drawings:

figure 1 - diagram of a common communication network, including a system of BML;

figure 2 - diagram of the transmitter IDV in the system BML according to the present invention;

figure 3 - diagram of the detection and transmission of information IDV in figure 2;

4 is a block diagram of the detection of the PAP signal in figure 2; and

figure 5 is a detailed block diagram of a detection unit IDEV in figure 2.

DETAILED DESCRIPTION OF THE INVENTION

Below are described in more detail the preferred variants of the present invention, examples of which are presented in the accompanying drawings.

FIG. 2 shows a block diagram of an IDV information transmitter in an LSU system according to the present invention.

In FIG. 2, the IDV information transmitter in the BML system according to the present invention includes both the outgoing message MSC 200 and the incoming message MSC 300 that relay the information identifying the caller (IDM) through the wired terminal 100; a BML system 600 processing IDEV information that is transmitted from the MSC 300 of incoming messages through an additional processing procedure; and a BML terminal 500, which displays on-screen IDEV information processed by the BML system 600.

The BML system 600 includes BSC 60 and BS 61. The BSC 60 includes a PAP signal detecting unit 60-1 that performs the function of evaluating the moment of detection of the IDV information; a selector 60-2, requiring the transmission of the IDE information from the MSC 300 of incoming messages in accordance with the detection evaluation signal from the PAP signal detection unit 60-1; an IDV detection unit 60-3 detecting the IDV information in the modulated data received from the MSC 300 incoming messages in accordance with the detection evaluation signal from the PAP signal detection unit 60-1; and a vocoder 60-4 encoding voice data transmitted from the MSC 300 incoming messages.

Next, with reference to the accompanying drawings, the operation of the IDE transmitter with the above structure in the BML system according to the present invention is explained.

When the caller makes an attempt to establish a call connection using his wired terminal 100, the caller’s phone number, that is, the IDV (Caller ID) is modulated by the CCMS 200 outgoing messages, and then transmitted to the CCMS 300 incoming messages via the PSTN. In this case, the IDF information is modulated in one of the following ways: FMN (frequency shift keying), AMN (amplitude keying), DMCH (dual-tone multi-frequency dialing), or FMN (phase shift keying). For convenience of explanation, we assume that the IDEV information transmitted from the CCMS 300 of incoming messages is modulated with conversion to FMN data.

In Fig.3 shows a diagram of the detection and transmission of information IDV in Fig.2.

MSC 300 incoming messages (Fig. 3) before transmitting modulated data (FMN, AMN, DMCHN, FCHN) IDV transmitted from MSC 200 outgoing messages, transmits PAP (warning signal for equipment located in the user's premises) to the system 600 BML. If a PAP signal is detected in a call signal transmitted from the CCMS 300 of incoming messages, the BML system 600 transmits an ACK confirmation signal.

In accordance with the signal of the ASK CKMS 300 incoming messages transmits FMN data IDV information to the system 600 BML. The BML system 600 detects the IDV information to be forwarded, i.e., the telephone number of the call initiator, in the FMN data transmitted from the MSC 300 incoming messages, and then transmits the detected telephone number of the call initiator directly to the corresponding BML terminal 500. Thus, the called party has the ability to accurately determine the telephone number of the caller, which is displayed on the screen of the BML terminal. After completion of the transmission of the IDV information, the BML system processes the speech signal transmitted from the MSC 300 of incoming messages, and then transmits the processed speech signal to the BML terminal 500.

The operation for detecting the IDV information is explained in detail below.

Figure 4 presents the block diagram of the detection signal PAP indicated in figure 2. Depicted in FIG. 4, the MSC 300 of incoming messages transmits a call signal to the VML system 600 before transmitting the FSM data. The PAP signal detecting unit 60-1 of the BML system 600 detects the PAP signal in the call signal in order to evaluate the time of detection of the FMN data (S100-S200).

At the time of detecting the FMN data, the call initiation state and the call waiting state can be distinguished. In the call initiation state of the FMN, data is received from the MSC 300 of incoming messages between the first call and the second call. In this case, since the moment of detection of the FSM data can be determined by the out-of-band signal, there is no need in the PAP signal detecting unit 60-1.

Meanwhile, in the idle state of the call, the incoming MSC 300 transmits a SOA signal (subscriber alert signal) and a PAP signal to the BML system 600 before transmitting the FMN data. The SOA signal informs the caller that a third party has requested a call. Accordingly, in order to determine the moment of detection of the FSM data, it is necessary to isolate the PAP signal, for which a block 60-1 of the detection of the PAP signal will be required.

In this case, the detection of the PAP signal is provided by the PAP detection unit 60-1 in the BSC 60. Since the PAP signal is usually characterized by the presence of DFM (two-tone multi-frequency dialing) with two frequency components 2130 Hz ± 1.5% and 2170 Hz ± 1.5%, In the present invention, the Goertzel algorithm is used to detect the PAP signal.

Namely, the PAP 60-1 detection unit calculates the components k = 41, 42, 43, (2130 Hz ± 1.5%) and k = 54, 55, 56 (2170 Hz ± 1.5%), respectively, using the Goertzel algorithm (Goertzel) and saves them in y1, y2, and then calculates y1 + y2 and saves them in y. After the calculation is completed, the PAP detection unit 60-1 compares y1 and y2 with the total frame energy FE1 energy_frame × threshold 1 (= 0.35), respectively. If y1 and y2 are greater than the first total frame energy, then y is compared with the total frame energies FE2 energy_frame × threshold 2 (= 0.8). As a result of the comparison, if y has more than the total energy of the FE2 frame, then the PAP detection unit 60-1 increases the value of the PAP counter. This procedure is performed for each frame. If the counter value increases in three consecutive frames, then the PAP detection unit 60-1 decides that the PAP signal is detected, and outputs the PAP detection signal to the selector 60-2, the IDV detection unit 60-3 and the vocoder 60-4.

As soon as the PAP signal is detected in the call signal, the PAP detection unit 60-1 instructs the IDV detection unit 60-3 so that it can detect the IDV information, that is, the telephone number of the calling subscriber, in the FMN data transmitted from the CCMS 300 incoming messages, and stops the vocoder 60-4 (S130). Thus, the IDV detection unit 60-3 detects the telephone number of the caller in the data FMN, and then provides the detected telephone number to the selector 60-2. Next, the detected telephone number of the calling subscriber is transmitted to the terminal 500 BML through BS 61.

Accordingly, in the present invention, the IDV information is processed using a processing procedure different from the speech signal processing procedure, which helps to prevent the destruction of the IDV information caused by the vocoder in the prior art.

Figure 5 presents a detailed block diagram of a block 60-3 detection IDV shown in figure 2.

Figure 5 shows that when entering data from the FMN r (t), the mixer 50 of the IDV detection unit 60-3 mixes r (t) with the logical signal “0” reference exp (j2πf ₀ t), and another mixer 51 mixes r ( t) with a reference signal exp (j2πf ₁ t) of logic "1". Then the output values of the mixers 50 and 51 are filtered in the low-pass filters 52 and 53, so that the final results are expressed by the following formulas:

Thus, the absolute value calculation units 54 and 55 compute the absolute values u (t) and v (t) processed in the low pass filters 52 and 53, after which the comparator 55 determines whether r (t) is a logical “0” or “ 1 "by comparing the absolute values of u (t) and v (t) with each other.

Thus, the IDV detection unit 60-3 detects an incoming telephone number, which should initially be transmitted, only from data from the FMN transmitted from the CCMS 300 incoming messages, and then transmits the detected telephone number via the selector 60-2. After that, as soon as the determination of the caller’s phone number is completed, the IDV detection unit 60-3 stops working in accordance with the PAP detection signal issued by the PAP detection unit 60-1, after which the vocoder 60-4 resumes operation. Thus, the speech signal transmitted from the MSC 300 incoming messages is decoded in vocoder 60-4 in the BML system, and then transmitted to the BML terminal 500.

As mentioned in the above description, the present invention estimates the timing of the detection of the IDV information, detects the IDV information in the modulated signal using a processing procedure different from the speech signal processing, and the detected IDV information is sequentially transmitted to the LSU terminal. Therefore, the present invention allows in advance to prevent the destruction of the information IDV caused by vocoder in the prior art.

The above options are merely examples and should not be construed as limitations on this invention. These ideas can be easily applied to other types of devices. It is intended that this description of the present invention be an illustration and not limit the scope of the claims. Specialists in the art will easily find many alternatives, modifications and variations of the present invention.

Claims (17)

1. A wireless local communication line (BMS) system comprising a base station controller (BSC) that detects caller identification information (IDC) in a modulated signal transmitted from a mobile switching center (MSC), and a terminal that displays the detected IDEV information, wherein the BSC includes a PAP signal detection unit (warning signal for equipment located in the user's premises) detecting a PAP signal in a call signal transmitted from the CCMS in the standby state the call, the IDV detection unit that detects the IDV information in the modulated data in accordance with the PAP detection signal, a vocoder encoding the speech data transmitted from the MSC, and a selector that selects an output signal of the vocoder or the IDV detection unit in accordance with the PAP detection signal, and transmits this output signal to the terminal through the base station. 2. The BML system according to claim 1, in which the BSC detects the IDV information in the modulated signal when a PAP signal is detected in the call signal. 3. The BML system according to claim 2, in which the modulated signal is a signal modulated by one of the methods, which include frequency shift keying (FMN), amplitude shift keying (AMN), dual-tone multi-frequency dialing (DMCH) and phase shift keying (FMN). 4. The BML system according to claim 1, in which the IDV detection unit detects the IDV information in the modulated data in accordance with an out-of-band signal in a call initiation state. 5. The BML system according to claim 1, in which the IDV detection unit comprises first and second mixers mixing the modulated signals with the first and second reference signals, respectively, the first and second low-pass filters (LPFs) filtering the output signals of the first and second mixers, respectively, the first and second absolute value calculation blocks calculating the absolute values of the output signals of the first and second low-pass filters, respectively, and a comparator that determines the logical value by comparing with each other GOVERNMENTAL signals of the first and second blocks calculate absolute values. 6. The BML system according to claim 5, in which the first and second reference signals are exp (j2πf ₀ t) and exp (j2πf ₁ t), respectively, where f ₀ and f ₁ are respectively 1200 and 2200 Hz. 7. A base station controller (BSC) in a wireless local communication line (BLL) system, comprising a PAP signal detection unit (warning signal for equipment located in a user's premises) that detects a PAP signal in a call signal transmitted from a mobile switching center ( CCMS), an IDV detection unit (caller identification information) that detects the IDV information in modulated data transmitted from the CCMS when a PAP signal is detected, a vocoder encoding voice data transmitted from CCMS, if the PAP signal is not detected, and a selector that selects the output signal of the vocoder or IDEV detection unit in accordance with the PAP detection signal, and transmits this output signal to the terminal through the base station. 8. KBS according to claim 7, in which the modulated data is a signal modulated by one of the methods, which include frequency shift keying (FMN), amplitude shift keying (AMN), dual-tone multi-frequency dialing (DMCH) and phase shift keying (PSK). 9. KBS according to claim 7, in which the IDV detection unit comprises first and second mixers mixing the modulated signals with the first and second reference signals, respectively, the first and second low-pass filters (LPFs) filtering the output signals of the first and second mixers, respectively, the first and the second absolute value calculation blocks calculating the absolute values of the output signals of the first and second low-pass filters, respectively, and a comparator that determines the logical value by comparing the output signals with each other als first and second blocks calculate absolute values. 10. The BSC according to claim 9, in which the first and second reference signals are exp (j2πf ₀ t) and exp (j2πf ₁ t), respectively, where f ₀ and f ₁ are respectively 1200 and 2200 Hz. 11. KBS according to claim 7, in which the vocoder begins to perform paused decoding of speech data when the detected IDV information is fully decoded. 12. A method for transmitting IDV (caller identification information) in a wireless local communication line (BLL) system, comprising the steps of: detecting a PAP signal in a call signal transmitted from a mobile switching center (CCMS) through a PAP signal detection unit if the terminal is in a waiting state of a call, the identification information of the calling subscriber (IDV) is detected by the IDV signal detecting unit in the modulated data transmitted from the MSC, if a PAP signal is detected, select osredstvom vocoder selector output signal or IDV detection unit in accordance with the PAP detection signal is transmitted to the output terminal via the base station and displayed on the screen of the terminal information transmitted IDV. 13. The method according to item 12, in which the modulated data is data modulated by one of the methods, which include frequency shift keying (FMN), amplitude shift keying (AMN), dual-tone multi-frequency dialing (DMCH) and phase shift keying (PSK). 14. The method according to item 12, in which the PAP signal is detected using the Goertzel algorithm. 15. The method according to item 12, in which the detection of the PAP signal comprises the steps of: calculating the component 2130 Hz ± 1.5% and the component 2170 Hz ± 1.5% in the modulated data and remember the components 2130 Hz ± 1.5% and 2170 Hz ± 1.5% in the first and second memory cells, respectively, summarize the component 2130 Hz ± 1.5% with the component 2170 Hz ± 1.5% in order to remember the total value in the third memory cell, compare in order to find out more whether each of the stored values in the first and second memory cells of the first total frame energy is compared to determine whether the stored value in the third memory cell of the second total frame energy is greater, if each of the stored values in the first and second memory cells is greater than the first total frame energy, the FAP counter is increased if the stored value in the third memory cell is greater than the second total frame energy, check whether the counter value is constantly increasing in three consecutive frames, and a decision is made that the PAP signal is detected if the counter value is constantly increasing for three consecutive frames. 16. The method according to item 12, in which the stage of the detection of IDE contains the steps: mix the modulated data with the first and second reference signals, respectively, filter the output signals of the first and second mixers, calculate the absolute values in accordance with the output signals of the first and second low-pass filters and determine the logical value by comparing with each other the output signals of the first and second blocks for calculating absolute values. 17. The method according to clause 16, in which the first and second reference signals are exp (j2πf ₀ t) and exp (j2πf ₁ t), respectively, where f ₀ and f ₁ are respectively 1200 and 2200 Hz.

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