KR930004093B1 - Probability increasing device and method - Google Patents

Abstract

The apparatus maintains the maximum output power of a cellular phone when accessing a cell site by cutting off negative feed-back automatic power control to improve the reliabity of access. It includes a coupling section (2) connected to an HF power amplifier (1) for detecting feed-back parameter, a D/A converter (5) for setting the output level of high-frequency component, a comparator (4) for comparing the feed-back parameter with the output level of high-frequency component, and a current boosting section (6) for controlling the HF power amplifier (1).

Description

Apparatus and method for increasing initial access probability of cellular phone

1 is a block diagram of an initial access probability increasing apparatus according to the present invention.

2 is a flowchart illustrating a procedure of an initial access probability increase method according to the present invention.

* Explanation of symbols for main parts of the drawings

1: high frequency power amplifier 2: coupler

3: amplifier 4: comparator

5: D / A converter 6: Current booster

TR1: transistor R1, R1: resistor

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for increasing an initial access probability for increasing an initial data transmission and reception probability in a weak electric field in a cellular phone.

If a high transmit power can be maintained for about 0.1 seconds in the initial access phase, the probability of success of the initial data access increases, and the process for the subsequent formation of the call is an analog process that is not associated with the data bit error. In other words, whether or not a call is possible or not depends largely on the reliability of the initial data access process.

In a conventional cellular phone, the transmission power of the cellular phone becomes level "0" (34.8 dBm) when the cell phone is located in a weak electric field area, that is, an area where data transmission or reception with a cell site is relatively difficult. The value of "does not change from time to time, but is sent out at a fixed value at the time of production.

Therefore, since the initial access success rate of whether the base station recognizes or not the call request data of the cellular phone in the weak field area depends on the transmission power of the cellular phone, the call success rate of the conventional cellular phone in the weak field area is determined by the cellular phone. There was a problem that was preset at the time of production.

Invented to eliminate the above problem, the present invention instantaneously opens a negative feed back automatic power control loop to maintain a constant output level at the time of transmission to provide the highest possible output in design during the data access period. It is an object of the present invention to provide an apparatus and method for increasing initial access probability for maintaining and improving the reliability of a cellular phone.

In order to achieve the above object, the present invention provides a CPU (Central Processing Unit), a high frequency power amplification means, a coupler means connected to the high frequency power amplification means for detecting a feedback parameter, an amplification means connected to the coupler means, is connected to the CPU Digital / analog converting means for setting a high frequency output level through the data output from the CPU, comparing means connected to the amplifying means and digital / analog converting means for comparing the feedback parameter with the high frequency output level, and the comparing means; An apparatus for increasing an initial access probability of a cellular phone, comprising: a current booster means connected to a high frequency power amplification means and controlling the high frequency power amplification means using an output of the comparing means. Connected to the amplifier according to the output signal of the CPU A first step of preparing a data stream if the cellular phone is in an initial data access mode by searching for the state of the cellular phone by using an initial access probability increasing apparatus configured as described above and configured to add switching means for controlling the A second step of preparing reverse data when the phone is in a call mode, a third step of outputting a signal to turn on the switching means until the data stream and the reverse data are transmitted, and a signal to turn off the switching means It is characterized in that performed by the fourth step.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

1 is a block diagram of an apparatus for increasing initial access probability according to the present invention, 1 is a high frequency power amplifier, 2 is a coupler, 3 is an amplifier, 4 is a comparator, 5 is a D / A converter, 6 is a current booster, TR1 is a transistor, R1 and R2 represent resistances, respectively.

In general, the final transmission output of the cellular phone is set with multiple high-frequency output levels so that the minimum high-frequency output required for maximum effect and quality calls is formed by using channel utilization and interference cancellation with minimum energy. It is.

In the apparatus for increasing the initial access probability of the output unit of the cellular phone according to the present invention, as shown in FIG. 1, a coupler 2 is connected to the high frequency power amplifier 1 and an amplifier 3 is connected to the coupler 2. And connect the positive and negative input terminals of the comparator 4 to the D / A converter 5 connected to the CPU and the amplifier 3, and the high frequency power amplifier 1 and the comparator. Connect the current booster 6 to (4), connect the collector of the npn transistor TR1 with the emitter grounded to the output terminal of the amplifier 3, and the base of the npn transistor TR1 connected to the CPU. do.

The D / A converter 5 receives 3 bits of data ABC for setting the high frequency output level from the central processing unit (CPU) and sets one of the "0" to "7" levels.

In addition, the coupler 2 detects a feedback parameter through the output of the high frequency power amplifier 1 and inputs it to the amplifier 3.

The high frequency output level set by the D / A converter 5 and the feedback parameters output from the amplifier 3 are input to the comparator 4 and compared. The comparator 4 outputs "0" if the feedback parameter of the amplifier 3 is higher than the high frequency output level of the D / A converter 5, and outputs "1" if it is low, thereby amplifying the high frequency power through the residual booster 6. The unit 1 is controlled to amplify the current.

The npn transistor TR1 is turned on / off by a full bit logic signal of " 1 " or " 0 " output from the CPU to short or open the output of the amplifier 3, resulting in feedback. The loop can be opened or shorted to obtain the maximum output from the high frequency power amplifier 1.

That is, when the control signal of the CPU is "1", the npn transistor TR1 is turned on to short the output of the amplifier 3 so that the output of the amplifier 3 is "0" so that the D / A converter 5 Regardless of the output, the output of the comparator 4 is always "1" and is composed of the amplifier 3, the comparator 4 and the current booster 6 so that the cycle of raising and lowering the feedback loop is stopped and always raised. By operating only to the side, it is possible to obtain the maximum output possible by the high frequency power amplifier 1.

2 is a flowchart illustrating a procedure of an initial access probability increase method according to the present invention, which controls a full signal to short or open a feedback loop by turning on / off the npn transistor TR1 output from the CPU. It shows the order of the method of increasing the initial access probability for.

First, it is searched whether it is an initial data access mode (10). If it is an initial data access mode, it is searched until it is transmitted (20). If it is being transmitted, it is searched whether a data stream is ready (30). If the data stream is not ready, the process proceeds to searching for transmission. If the data stream is ready, the npn transistor TR1 is turned on by setting the full bit for turning on / off the npn transistor TR1 to "1" (60). ).

If it is not in the initial data access mode, it is searched whether it is in call mode (40), and if it is not in call mode, it returns to the initial state, and if it is in call mode, it searches for the inverse data ready state until it is ready in reverse mode (50), and the reverse data is ready. Set the full bit to " 1 " (60).

After setting the full bit to "1", it checks whether the data stream and reverse data has been transmitted (70) .If the transmission is not completed, after a certain time delay until the transmission is completed (90), sets the full bit back to "1". The process proceeds to find the data stream and reverse data transmission status.

When the data stream transfer is completed, the full bit is set to "0" to turn off the npn transistor TR1 and return to the initial state (80).

The present invention configured and operated as described above has the effect of increasing the probability of forming a call of a cellular phone in the outlying downtown area, increasing the distance available for the call and reducing the phenomenon of disconnection of the call during the call.

Claims (3)

A CPU (Central Processing Unit), a high frequency power amplifying means (1), a coupler means (2) connected to the high frequency power amplifying means (1) for detecting a feedback parameter, and an amplifying means (3) connected to the coupler means (2). And a digital / analog converting means (5), the amplifying means (3) and a digital / analog converting means (5), connected to the CPU to set a high frequency output level through the data output from the CPU. A comparison means (4) for comparing the high frequency output level with the comparison means (4) and the high frequency power amplification means (1) by using the output of the comparison means (4). An initial access probability increasing apparatus of a cellular phone, comprising: controlling a current booster means; And an additional switching means connected to the output terminal of the CPU and the amplifying means to control the output of the amplifying means in accordance with the output signal of the CPU. The method of claim 1, wherein the switching means comprises an npn transistor TR1 having a base connected to the CPU, a collector connected to an output terminal of the amplifying means 3, and an emitter grounded. Device. A CPU (Central Processing Unit), a high frequency power amplifying means (1), a coupler means (2) connected to the high frequency power amplifying means (1) for detecting a feedback parameter, and an amplifying means (3) connected to the coupler means (2). And a digital / analog converting means (5), the amplifying means (3) and a digital / analog converting means (5), connected to the CPU to set a high frequency output level through the data output from the CPU. And a comparison means (4) for comparing the high frequency output level with the comparison means (4) and the high frequency power amplifier (1) to control the high frequency power amplifier (1) using the output of the comparison means (4). A current booster means 6 and switching means connected to the output terminals of the CPU and the amplification means 3 to control the output of the amplification means 3 according to the output signal of the CPU. Initial access check In increasing device; A first step of retrieving the state of the cellular phone and preparing a data stream if the cellular phone is in an initial data access mode, a second step of preparing reverse data if the cellular phone is in a call mode, transmitting the data stream and reverse data And a fourth step of outputting a signal to turn on the switching means until completion, and a fourth step of outputting a signal to turn off the switching means.