KR20000026064A - Method for controlling minimum output of cdma terminal device - Google Patents

Method for controlling minimum output of cdma terminal device Download PDF

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Publication number
KR20000026064A
KR20000026064A KR1019980043436A KR19980043436A KR20000026064A KR 20000026064 A KR20000026064 A KR 20000026064A KR 1019980043436 A KR1019980043436 A KR 1019980043436A KR 19980043436 A KR19980043436 A KR 19980043436A KR 20000026064 A KR20000026064 A KR 20000026064A
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South Korea
Prior art keywords
cdma terminal
power amplifier
output
terminal device
minimum
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KR1019980043436A
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Korean (ko)
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정성호
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김영환
현대전자산업 주식회사
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Priority to KR1019980043436A priority Critical patent/KR20000026064A/en
Publication of KR20000026064A publication Critical patent/KR20000026064A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/52—TPC using AGC [Automatic Gain Control] circuits or amplifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2628—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

PURPOSE: A method for controlling a minimum output of a CDMA terminal device is provided to satisfy easily and simply a minimum output specification of the CDMA terminal device without additional circuit by offsetting an output gain of a power amplifier by controlling a voltage applied in the power amplifier included in the CDMA terminal device when the CDMA terminal device should generate the minimum output. CONSTITUTION: A method for controlling a minimum output of a CDMA terminal device includes a first through third steps. The first step is to determine when a CDMA terminal device outputs a transmittance signal with a minimum power from a signal force of a transmittance power of a base station input into the CDMA terminal device. The second step is to offset the output gain of a power amplifier(7) to a minimum by controlling an applied voltage of the power amplifier by DC-DC converter(4) when the minimum power output in the first step, and then amplifies the transmittance signal of the CDMA terminal device by the output gain on order to transmit into the base station. The third step is to transmit by amplifying the transmittance signal of the CDMA terminal device in the base station by the output gain of the power amplifier by keeping up the applied voltage of the power amplifier when the CDMA terminal device operates in a normal mode in the first step.

Description

씨디엠에이 단말기의 최소 출력 제어방법Minimum output control method of CDM terminal

본 발명은 코드 분할 다중 접속(Code Division Multiple Access ; 이하, 'CDMA'라 칭함) 방식의 이동통신용 단말기내에 구비되는 전력 증폭기(Power Amplifier)의 인가 전압을 제어하여 CDMA 단말기의 최소 출력 규정을 만족시킬 수 있도록 한 CDMA 단말기의 최소 출력 제어방법에 관한 것이다.The present invention can satisfy the minimum output regulation of a CDMA terminal by controlling an applied voltage of a power amplifier included in a code division multiple access (CDMA) type mobile communication terminal. A minimum output control method of a CDMA terminal is provided.

일반적으로 CDMA 단말기는 기지국으로 송출하는 송신전력의 출력을 제어함으로써 사용자 수를 최대한 확보하는 것이 최대의 기술이고 장점이며, 그 일환으로 기지국으로부터의 수신신호가 일정 세기일 경우 CDMA 단말기에서는 반대로 최소의 출력을 내야 한다.In general, it is the maximum technology and advantage that the CDMA terminal secures the maximum number of users by controlling the output of the transmission power transmitted to the base station. As a part, when the received signal from the base station is a certain intensity, the CDMA terminal, on the contrary, the minimum output Should pay.

만약, CDMA 단말기에서 상기와 같은 규정을 지키지 않으면 CDMA 단말기의 최대 장점인 사용자 가용수 확보에 절대적인 영향을 미치게 된다.If the above regulations are not observed in the CDMA terminal, the CDMA terminal will have an absolute effect on securing the user available water, which is the biggest advantage of the CDMA terminal.

이에 따라, 종래에는 CDMA 단말기가 표준 부품을 사용하여 최소 출력을 내도록 설계되어 있었으나, 송신 경로상의 자동이득제어(Automatic Gain Control ; AGC)회로, 업 컨버터(Up Converter), 전력 증폭기 등의 이득을 조정하더라도 최종 출력을 내는 전력 증폭기의 이득이 너무 세기 때문에 CDMA 단말기의 최소 출력 규정인 -50dBm을 만족시키기 어려웠다.Accordingly, although the CDMA terminal is conventionally designed to produce a minimum output using standard components, the gain of an automatic gain control (AGC) circuit, an up converter, a power amplifier, or the like on the transmission path is adjusted. Even so, the gain of the final output power amplifier was so strong that it was difficult to meet the minimum output specification of -50dBm for CDMA handsets.

즉, CDMA 단말기가 통화 상태일 때 전력 증폭기의 동작 전압을 5V의 제 동작 전압으로 인가하기 때문에 전력 증폭기가 정상적으로 동작하여 전력 증폭기가 갖는 25dB의 정상 이득을 모두 출력하므로 최소 출력을 내야 하는 순간 다른 송신 경로에서 아무리 출력을 최소화하려해도 한계에 도달할 수 밖에 없었다.That is, since the CDMA terminal applies the operating voltage of the power amplifier to the 5V operating voltage when the CDMA terminal is in a call state, the power amplifier operates normally and outputs 25dB of normal gain of the power amplifier. No matter how small the output on the path, the limit was reached.

특히, 업 컨버터와 같은 변환 이득(Conversion Gain)을 갖는 경로에 대해 그 변환 이득을 최소화하여도 CDMA 단말기의 최소 출력을 내기에는 불안정하였다.In particular, even for a path having a conversion gain such as an up converter, even when the conversion gain is minimized, it is unstable to produce the minimum output of the CDMA terminal.

본 발명은 상기와 같은 문제점을 해결하기 위해 안출한 것으로서, 그 목적은 CDMA 단말기가 최소 출력을 내야 하는 순간에 CDMA 단말기내 전력 증폭기에 인가되는 전압을 제어하여 전력 증폭기의 출력 이득을 감쇠시켜 줌으로써 별도의 추가회로 없이 보다 쉽고 간단하게 CDMA 단말기의 최소 출력 규정을 만족시킬 수 있도록 한 CDMA 단말기의 최소 출력 제어방법을 제공하는 데에 있다.The present invention has been made to solve the above problems, and the object of the present invention is to control the voltage applied to the power amplifier in the CDMA terminal at the moment when the CDMA terminal needs to output the minimum output by attenuating the output gain of the power amplifier. It is an object of the present invention to provide a minimum output control method of a CDMA terminal so that the minimum output regulation of the CDMA terminal can be easily and simply achieved without additional circuits.

도 1은 본 발명의 최소 출력 제어방법을 구현하기 위한 씨디엠에이 단말기의 송신 경로에 따른 블록 구성도,1 is a block diagram according to a transmission path of a CD terminal for implementing a method of controlling a minimum output of the present invention;

도 2는 본 발명에 의한 씨디엠에이 단말기의 최소 출력 제어방법을 보인 동작 흐름도.2 is a flowchart illustrating a method of controlling a minimum output of a CD terminal according to the present invention.

<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>

1 : 듀플렉서 2 : 수신단1: duplexer 2: receiver

3 : MSM 4 : DC-DC 컨버터3: MSM 4: DC-DC converter

5 : 업 컨버터 6 : BPF5: up converter 6: BPF

7 : 전력 증폭기 8 : 아이솔레이터7: power amplifier 8: isolator

이러한 목적을 달성하기 위한 본 발명의 CDMA 단말기의 최소 출력 제어방법은, CDMA 단말기로 수신되는 기지국의 송신전력의 신호 세기로부터 CDMA 단말기가 최소의 전력으로 송신신호를 출력해야 하는 순간인지를 판단하고, 이 판단 결과 최소 출력 순간이라면 전력 증폭기의 인가 전압을 제어하여 전력 증폭기의 출력 이득을 최소로 감쇠시킨 후 이 이득만큼 CDMA 단말기의 송신신호를 증폭하여 기지국으로 송출하도록 하고, 상기 판단 결과 최소 출력 순간이 아닌 정상적인 동작 순간이라면 전력 증폭기의 인가 전압을 그대로 유지하여 전력 증폭기가 갖는 출력 이득만큼 CDMA 단말기의 송신신호를 증폭하여 기지국으로 송출하도록 함을 특징으로 한다.The minimum output control method of the CDMA terminal of the present invention for achieving the above object is determined from the signal strength of the transmission power of the base station received by the CDMA terminal to determine whether the CDMA terminal should output the transmission signal at the minimum power, As a result of the determination, if the minimum output moment is applied, the applied voltage of the power amplifier is controlled to attenuate the output gain of the power amplifier to the minimum, and then the amplified transmission signal of the CDMA terminal is transmitted to the base station by this gain. In the normal operating moment, the voltage applied to the power amplifier is maintained as it is, and the amplified signal of the CDMA terminal is output to the base station by the output gain of the power amplifier.

이하, 첨부된 도면을 참고하여 본 발명에 의한 CDMA 단말기의 최소 출력 제어방법을 상세히 설명한다.Hereinafter, a minimum output control method of a CDMA terminal according to the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명의 최소 출력 제어방법을 구현하기 위한 CDMA 단말기의 송신 경로에 따른 블록 구성도로서, 송수신 기능을 통해 기지국과의 RF신호를 송수신하는 듀플렉서(Duplexer)(1)와, 상기 듀플렉서(1)를 통해 수신된 기지국으로부터의 RF신호를 입력하여 IF신호로 변환하고, 이를 다시 기저대역 신호로 변환하는 수신단(2)과, 상기 수신단(2)에서 변환된 기저대역 신호로부터 기지국 송신전력의 신호 세기를 감시하여 CDMA 단말기가 최소 출력을 내야 하는 순간에 해당 전압 제어신호를 출력하는 MSM(Mobile Station Modem)(3)과, 상기 MSM(3)에서 출력되는 전압 제어신호에 따라 배터리(BAT)의 전압을 소정의 전압으로 변환하여 전력 증폭기(7)로 출력하는 DC-DC 컨버터(4)와, 기지국으로 전송할 역방향 채널의 IF신호를 RF신호로 변환하는 업 컨버터(5)와, 상기 업 컨버터(5)에서 변환된 RF신호중 희망대역의 신호만을 통과시키는 대역통과필터(Band Pass Filter ; 이하, 'BPF'이라 칭함)(6)와, 상기 DC-DC 컨버터(4)에서 출력되는 인가 전압에 따라 상기 BPF(6)를 통과한 RF신호의 전력을 증폭하는 전력 증폭기(7)와, 상기 듀플렉서(1)를 통해 상기 전력 증폭기(7)에서 증폭된 RF신호를 송신하는 경우 안테나(Ant)를 통해 다시 반사되어 입력되는 신호를 차단하는 아이솔레이터(Isolator)(8)를 포함하여 구성된다.1 is a block diagram according to a transmission path of a CDMA terminal for implementing a minimum output control method of the present invention. The duplexer 1 transmits and receives an RF signal with a base station through a transmission and reception function, and the duplexer ( 1) receiving the RF signal from the base station received through 1) and converting it into an IF signal, and converting it into a baseband signal again; and from the baseband signal converted by the receiving end 2, A mobile station modem (MSM) 3 that monitors signal strength and outputs a corresponding voltage control signal at the moment when the CDMA terminal needs to output a minimum output, and a battery BAT according to the voltage control signal output from the MSM 3. A DC-DC converter 4 for converting a voltage of a predetermined voltage into a predetermined voltage and outputting the same to a power amplifier 7, an up-converter 5 for converting an IF signal of a reverse channel to be transmitted to a base station into an RF signal; To 5 A band pass filter (hereinafter, referred to as a 'BPF') 6 for passing only signals of a desired band among the converted RF signals, and the BPF according to an applied voltage output from the DC-DC converter 4. When the power amplifier 7 amplifies the power of the RF signal passing through 6) and the RF signal amplified by the power amplifier 7 through the duplexer 1 is reflected back through the antenna Ant It comprises an isolator (8) for blocking the input signal.

상기와 같이 구성된 CDMA 단말기에서의 최소 출력 제어방법을 도 2의 흐름도를 참조하여 설명하면 다음과 같다.The minimum output control method in the CDMA terminal configured as described above will be described with reference to the flowchart of FIG. 2.

먼저, CDMA 단말기내 MSM(3)에서는 듀플렉서(1) 및 수신단(2)을 통해 수신되는 기지국의 신호로부터 기지국 송신전력의 신호 세기를 감시하여(S1) CDMA 단말기가 최소의 전력으로 송신신호를 출력해야 하는 순간인지를 판단한다(S2).First, the MSM 3 in the CDMA terminal monitors the signal strength of the base station transmission power from the signals of the base station received through the duplexer 1 and the receiving end 2 (S1) and the CDMA terminal outputs the transmission signal with the minimum power. It is determined whether or not the moment (S2).

즉, 기지국과 CDMA 단말기 사이의 거리가 최소인 경우인지를 판단하게 되는 것이다.That is, it is determined whether the distance between the base station and the CDMA terminal is the minimum.

상기 단계(S2)에서 최소 출력 순간이라면 MSM(3)은 CDMA 단말기로 인가되는 배터리(BAT)의 7.2V의 전압을 4V로 변환시키도록 해당 전압 제어신호를 DC-DC 컨버터(4)로 출력한다(S3).In the step S2, the MSM 3 outputs the corresponding voltage control signal to the DC-DC converter 4 so as to convert the voltage of 7.2V of the battery BAT applied to the CDMA terminal into 4V at the instant of the minimum output in step S2. (S3).

그러면, DC-DC 컨버터(4)는 상기 MSM(3)의 전압 제어신호에 따라 배터리(BAT)의 7.2V의 전압을 4V의 전압으로 변환하여 이를 전력 증폭기(7)로 인가한다.Then, the DC-DC converter 4 converts the voltage of 7.2V of the battery BAT into a voltage of 4V according to the voltage control signal of the MSM 3 and applies it to the power amplifier 7.

이후, DC-DC 컨버터(4)에서 인가되는 전압에 따라 전력 증폭기(7)는 출력 이득을 25dB에서 10dB로 감쇠시킨 후, 업 컨버터(5) 및 BPF(6)를 통과한 CDMA 단말기의 RF신호를 상기 감쇠시킨 이득만큼 증폭하여 최소의 출력을 갖는 CDMA 단말기의 송신신호를 듀플렉서(1) 및 안테나(Ant)를 통해 기지국으로 송출하도록 한다(S4).Then, the power amplifier 7 attenuates the output gain from 25 dB to 10 dB according to the voltage applied from the DC-DC converter 4, and then the RF signal of the CDMA terminal passed through the up converter 5 and the BPF 6. Amplifies by the attenuated gain to transmit the transmission signal of the CDMA terminal having the minimum output to the base station through the duplexer 1 and the antenna Ant (S4).

한편, 상기 단계(S2)에서 최소 출력 순간이 아닌 정상적인 동작 순간이라면 MSM(3)은 CDMA 단말기로 인가되는 배터리(BAT)의 7.2V의 전압을 정상적인 제 동작전압인 5V로 변환시키도록 해당 전압 제어신호를 DC-DC 컨버터(4)로 출력한다(S5).On the other hand, if the normal operation moment, not the minimum output moment in the step (S2), the MSM (3) controls the corresponding voltage to convert the voltage of 7.2V of the battery BAT applied to the CDMA terminal to 5V, the normal operating voltage The signal is output to the DC-DC converter 4 (S5).

그러면, DC-DC 컨버터(4)는 상기 MSM(3)의 전압 제어신호에 따라 배터리(BAT)의 7.2V의 전압을 5V의 전압으로 변환하여 이를 전력 증폭기(7)로 인가한다.Then, the DC-DC converter 4 converts the voltage of 7.2V of the battery BAT into a voltage of 5V according to the voltage control signal of the MSM 3 and applies it to the power amplifier 7.

이후, DC-DC 컨버터(4)에서 인가되는 전압에 따라 전력 증폭기(7)는 전력 증폭기(7)가 갖는 25dB의 이득만큼 업 컨버터(5) 및 BPF(6)를 통과한 CDMA 단말기의 RF신호를 증폭하여 듀플렉서(1) 및 안테나(Ant)를 통해 기지국으로 송출하도록 한다(S6).Then, according to the voltage applied from the DC-DC converter 4, the power amplifier 7 is the RF signal of the CDMA terminal passing through the up converter 5 and the BPF 6 by a gain of 25dB of the power amplifier 7 To amplify and transmit to the base station through the duplexer (1) and the antenna (Ant) (S6).

상기와 같이 본 발명에서는 전력 증폭기(7)에 인가되는 전압을 DC-DC 컨버터(4)를 통해 제어하여 전력 증폭기(7)의 출력 이득을 조절함으로써 CDMA 단말기의 송신신호에 대한 최소 출력을 만족시킬 수 있게 된다.As described above, in the present invention, the voltage applied to the power amplifier 7 is controlled through the DC-DC converter 4 to adjust the output gain of the power amplifier 7 to satisfy the minimum output of the transmission signal of the CDMA terminal. It becomes possible.

이상, 상기 설명에서와 같이 본 발명은 CDMA 단말기의 최소 출력 규정인 IS-98A의 스펙(Spec)을 만족시킬 수 있음에 따라 스펙 관리에 까다롭기로 이름난 미주지역으로의 수출도 가능하게 되고, 별도의 회로 추가없이 전력 증폭기의 인가 전압을 제어하는 간단한 동작을 통해 구현할 수 있어 원가 절감의 효과를 가져오게 된다.As described above, the present invention can satisfy the specification of IS-98A, which is the minimum output regulation of the CDMA terminal, so that it can be exported to the Americas, which is difficult to manage the specifications. It can be implemented through a simple operation of controlling the applied voltage of the power amplifier without adding a circuit, resulting in cost reduction.

Claims (1)

CDMA 단말기로 수신되는 기지국의 송신전력의 신호 세기로부터 CDMA 단말기가 최소의 전력으로 송신신호를 출력해야 하는 순간인지를 판단하는 제1단계와,A first step of determining whether the CDMA terminal should output the transmission signal with the minimum power from the signal strength of the transmission power of the base station received by the CDMA terminal; 상기 제1단계의 판단 결과 최소 출력 순간이라면 DC-DC 컨버터(4)에 의해 전력 증폭기(7)의 인가 전압을 제어하여 전력 증폭기(7)의 출력 이득을 최소로 감쇠시킨 후 이 이득만큼 CDMA 단말기의 송신신호를 증폭하여 기지국으로 송출하는 제2단계와,If the output of the power amplifier 7 is attenuated to a minimum by controlling the applied voltage of the power amplifier 7 by the DC-DC converter 4 as a result of the determination in the first step, the CDMA terminal is reduced by this gain. A second step of amplifying and transmitting the transmission signal to the base station; 상기 제1단계의 판단 결과 최소 출력 순간이 아닌 정상적인 동작 순간이라면 전력 증폭기(7)의 인가 전압을 그대로 유지하여 전력 증폭기(7)가 갖는 출력 이득만큼 CDMA 단말기의 송신신호를 증폭하여 기지국으로 송출하는 제3단계로 이루어지는 것을 특징으로 하는 씨디엠에이 단말기의 최소 출력 제어방법.As a result of the determination of the first step, if the normal operation moment is not the minimum output moment, the applied voltage of the power amplifier 7 is maintained as it is and the amplified transmission signal of the CDMA terminal is transmitted to the base station by the output gain of the power amplifier 7. The minimum output control method of the CD terminal, characterized in that the third step.
KR1019980043436A 1998-10-17 1998-10-17 Method for controlling minimum output of cdma terminal device KR20000026064A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100626216B1 (en) * 2004-12-09 2006-09-21 삼성전자주식회사 Apparatus and method for controling bias of power amplifier in mobile communication terminal

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100626216B1 (en) * 2004-12-09 2006-09-21 삼성전자주식회사 Apparatus and method for controling bias of power amplifier in mobile communication terminal

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