KR20020016111A - Signal to interference ratio measurement apparatus for downlink power control in mobile communication terminal equipment - Google Patents

Signal to interference ratio measurement apparatus for downlink power control in mobile communication terminal equipment Download PDF

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KR20020016111A
KR20020016111A KR1020000049263A KR20000049263A KR20020016111A KR 20020016111 A KR20020016111 A KR 20020016111A KR 1020000049263 A KR1020000049263 A KR 1020000049263A KR 20000049263 A KR20000049263 A KR 20000049263A KR 20020016111 A KR20020016111 A KR 20020016111A
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signal
power control
power
interference
mobile communication
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KR1020000049263A
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Korean (ko)
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KR100369657B1 (en
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정길영
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윤종용
삼성전자 주식회사
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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
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/241—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/711—Interference-related aspects the interference being multi-path interference
    • H04B1/7115—Constructive combining of multi-path signals, i.e. RAKE receivers
    • 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
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences

Abstract

PURPOSE: An SIR(Signal to Interference Ratio) measuring device for downlink power control in a mobile terminal is provided to measure the SIR of a mobile terminal more exactly for downlink power control. CONSTITUTION: An SIR measuring device consists of a lake finger(600), a noise measurement part(700), and a signal power measurement part(800). The lake finger(600) is comprised of a PN despreader(110), a walsh despreader(120), a mixer(130), a channel optimizer(1400, and a squarer(650). The noise measurement part(700) comprises a walsh despreader(310), a mixer(320), an error calculation part(330), a squarer(340), an adder(350), a multipath combiner(400), and an averager(760). The averager(760) calculates the mean symbol power. The signal power measurement part(800) comprises a multipath combiner(810), a squarer(820), an averager(830), and an adder(840).

Description

순방향 전력제어를 위한 이동 통신 단말기의 수신신호 대 간섭 비율 측정 장치{SIGNAL TO INTERFERENCE RATIO MEASUREMENT APPARATUS FOR DOWNLINK POWER CONTROL IN MOBILE COMMUNICATION TERMINAL EQUIPMENT}SIGNAL TO INTERFERENCE RATIO MEASUREMENT APPARATUS FOR DOWNLINK POWER CONTROL IN MOBILE COMMUNICATION TERMINAL EQUIPMENT}

본 발명은 이동통신시스템에 관한 것으로, 특히 순방향 전력제어를 위해 단말기에서 수신신호 대 잡음비(Signal to Interference ratio: 이하 SIR이라 함.)를 측정하는 방법에 관한 것이다.The present invention relates to a mobile communication system, and more particularly, to a method for measuring a signal to interference ratio (hereinafter referred to as SIR) in a terminal for forward power control.

3세대 이동통신시스템인 IMT-2000에서는 간섭을 줄여서 셀 용량을 증대시키기 위해서 순방향 내부 루프 전력제어(inner loop power control) 방식이 채택되었다. 그리고 전력제어의 성능은 신호전력 대 간섭신호전력을 어떻게 정확하게 측정하느냐에 좌우된다. 왜냐하면 측정된 신호전력 대 간섭신호전력이 목표(target) 신호전력 대 간섭신호전력과 비교되어 전력제어 되기 때문이다.In the third generation mobile communication system, IMT-2000, forward inner loop power control is adopted to increase cell capacity by reducing interference. And the performance of power control depends on how to accurately measure signal power vs. interference signal power. This is because the measured signal power versus the interference signal power is compared with the target signal power versus the interference signal power for power control.

도 1은 종래의 순방향 전력제어를 위한 이동 통신 단말기의 수신신호 대 간섭 비율 측정 장치의 구성을 나타낸 도면이다.1 is a diagram illustrating a configuration of an apparatus for measuring a reception signal-to-interference ratio of a conventional mobile communication terminal for forward power control.

W-CDMA 시스템에서 다운링크 전력제어(downlink power control)를 위해서 이동국에서 신호전력을 측정할 때 전용데이터채널(Dedicated Physical Data Channel: 이하 DPDCH라 함.)의 파일롯 심벌(known pilot symbol)을 이용한다. 하지만 데이터 비율(data rate)에 따라서 파일롯 심벌의 수도 가변적이다. 데이터 비율이 30kbps인 경우는 파일롯 심벌 개수가 2개에 불과하다. 이런 경우에는 신호 전력 측정을 위한 파일롯 심벌 수가 충분하지 않으므로 정확한 신호전력 대 간섭신호전력을 계산하기가 쉽지 않다.In the W-CDMA system, a pilot symbol of a dedicated physical data channel (hereinafter referred to as DPDCH) is used when measuring signal power in a mobile station for downlink power control. However, the number of pilot symbols varies depending on the data rate. If the data rate is 30kbps, only two pilot symbols are used. In this case, there are not enough pilot symbols for measuring signal power, so it is not easy to calculate accurate signal power vs. interference signal power.

따라서 본 발명의 목적은 정확도를 높인, 순방향 전력제어를 위한 이동 통신 단말기의 수신신호 대 간섭신호 비율 측정 장치를 제공함에 있다.Accordingly, an object of the present invention is to provide an apparatus for measuring a received signal to interference signal ratio of a mobile communication terminal for forward power control with improved accuracy.

상기한 목적을 달성하기 위한 본 발명은 순방향 전력제어를 위한 이동 통신 단말기의 수신신호 대 간섭 비율 측정 장치에 있어서, 레이크 수신기와, 전력 계산을 위한 제곱기와, 평균 심볼 전력을 구하기 위한 평균기와, 간섭신호를 제거하는덧셈기로 구성됨을 특징으로 한다.In order to achieve the above object, the present invention provides an apparatus for measuring a received signal-to-interference ratio of a mobile communication terminal for forward power control, comprising: a rake receiver, a squarer for power calculation, an averager for obtaining average symbol power, and interference It is characterized by consisting of an adder for removing the signal.

도 1은 종래의 순방향 전력제어를 위한 이동 통신 단말기의 수신신호 대 간섭 비율 측정 장치의 구성을 나타낸 도면1 is a diagram illustrating a configuration of an apparatus for measuring a reception signal to interference ratio of a conventional mobile communication terminal for forward power control;

도 2는 본 발명에 이용되는 프레임의 구조를 나타낸 도면2 is a view showing the structure of a frame used in the present invention

도 3은 본 발명의 실시 예에 따른 순방향 전력제어를 위한 이동 통신 단말기의 수신신호 대 간섭 비율 측정 장치의 구성을 나타낸 도면3 is a diagram illustrating a configuration of an apparatus for measuring a reception signal to interference ratio of a mobile communication terminal for forward power control according to an exemplary embodiment of the present invention.

이하 본 발명의 바람직한 실시 예를 첨부한 도면을 참조하여 상세히 설명한다. 우선 각 도면의 구성 요소들에 참조 부호를 부가함에 있어서, 동일한 구성 요소들에 한해서는 비록 다른 도면상에 표시되더라도 가능한 한 동일한 부호를 가지도록 하고 있음에 유의해야 한다. 하기 설명에서는 구체적인 회로의 구성 소자 등과 같은 많은 특정(特定) 사항들이 나타나고 있는데, 이는 본 발명의 보다 전반적인 이해를 돕기 위해서 제공된 것일 뿐 이러한 특정 사항들 없이도 본 발명이 실시될 수 있음은 이 기술 분야에서 통상의 지식을 가진 자에게는 자명하다 할 것이다. 그리고 본 발명을 설명함에 있어, 관련된 공지 기능 혹은 구성에 대한 구체적인 설명이 본 발명의 요지를 불필요하게 흐릴 수 있다고 판단되는 경우 그 상세한 설명을 생략한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals have the same reference numerals as much as possible even if displayed on different drawings. In the following description, numerous specific details such as components of specific circuits are shown, which are provided to help a more general understanding of the present invention, and it is understood that the present invention may be practiced without these specific details. It will be self-evident to those of ordinary knowledge. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

종래의 측정 장치가 갖는 문제는 신호전력을 측정할 파일롯 심벌 수가 충분하지 않다는 것이었던 바, 본 발명은 신호전력을 정확히 추정하기 위해서 심벌 수를 충분히 확보한다.The problem with the conventional measuring apparatus is that the number of pilot symbols to measure the signal power is not enough. The present invention ensures a sufficient number of symbols in order to accurately estimate the signal power.

구체적으로, 본 발명에 따른 다운링크 프레임 구조(frame structure)에 따르면, DPDCH와 전용제어채널(Dedicated Physical Control Channel: 이하 DPCCH라 함.)이 시간 다중화(time multiplex)되어 있다. 신호전력 측정을 위해 DPCCH의 파일롯 이외에도 데이터 필드 심벌들, 즉 송신 전력 제어(Transmit Power Control:이하 TPC라 함)와 수송 형태 결합 표시기(Transport Format Combination Indicator: 이하 TFCI라 함.) 심벌들을 이용하면 단지 파일롯 심벌만을 이용했을 때에 비하여 좀 더 정확한 신호전력을 측정할 수 있다.Specifically, according to the downlink frame structure according to the present invention, the DPDCH and the dedicated physical control channel (hereinafter referred to as DPCCH) are time multiplexed. In addition to the pilot of the DPCCH for signal power measurement, data field symbols, namely transmit power control (TPC) and transport format combination indicator (TFCI) symbols, More accurate signal power can be measured compared to using only pilot symbols.

도 2는 본 발명에 이용되는 프레임의 구조를 나타낸 도면이다.2 is a view showing the structure of a frame used in the present invention.

도 3은 본 발명의 실시 예에 따른 순방향 전력제어를 위한 이동 통신 단말기의 수신신호 대 간섭 비율 측정 장치의 구성을 나타낸 도면이다.3 is a diagram illustrating a configuration of an apparatus for measuring a reception signal to interference ratio of a mobile communication terminal for forward power control according to an exemplary embodiment of the present invention.

상기 장치는 레이크 핑거(600)와 잡음 측정부(700) 그리고 신호전력 측정부(800)로 구성된다.The apparatus consists of a rake finger 600, a noise measuring unit 700 and a signal power measuring unit 800.

상기 레이크 핑거(600)는 PN 역확산기(110), 월시 역확산기(120), 혼합기(130), 채널 최적화기(140) 그리고 제곱기(650)를 포함한다.The rake finger 600 includes a PN despreader 110, a Walsh despreader 120, a mixer 130, a channel optimizer 140, and a squarer 650.

잡음 측정부(700)는 월시 역확산기(310), 혼합기(320), 차이 계산부(330), 제곱기(340), 덧셈기(350), 다중경로결합기(400) 및 평균 심벌 전력을 구하기 위한 평균기(averager)(760)를 포함한다.The noise measuring unit 700 calculates a Walsh despreader 310, a mixer 320, a difference calculator 330, a squarer 340, an adder 350, a multipath combiner 400, and an average symbol power. An averager 760.

신호전력 측정부(800)는 다중경로결합기(810), 제곱기(820), 평균기(830) 그리고 덧셈기(840)를 포함한다.The signal power measuring unit 800 includes a multipath combiner 810, a squarer 820, an averager 830, and an adder 840.

단말기 레이크 수신기 I/Q 결합기(combiner)로부터 DPCCH 영역(field)(TFCI, TPC, PILOT)를 분리한 후에 각각의 심벌을 제곱한다. 이때 역확산, 결합하는 과정에서 인터페이스 효과는 많이 줄어 들지만, 제곱하는 과정에서 (신호성분)2, (간섭성분)2과 (신호성분)(간섭성분)이 나타나기 때문에 (간섭성분)2과 (신호성분)(간섭성분)을 제거해야 신호전력을 구할 수 있다.Each symbol is squared after separating the DPCCH fields (TFCI, TPC, PILOT) from the terminal rake receiver I / Q combiner. The despread, interface effects in the process of binding is presumably much less, because in the course of squares (signal components) 2, (interference component) 2 with (signal component) (interference component) to appear (interference component) 2 and (signal Component) (interference component) must be removed to obtain signal power.

먼저 (신호성분)(간섭성분)을 없애기 위해서 평균을 취한다. 그러면 (신호성분)2과 (간섭성분)2만이 남는다. 이때 이 신호전력과 간섭전력은 한 심벌에 해당하는 추정치이다. 그후에 심벌당 간섭전력을 없애려면, 퀄컴(Qualcomm)사에서 제안한 파일롯 채널을 이용한 전력제어 그룹에 해당하는 간섭전력 추정치를 구한 다음, 이를 심벌 갯수로 나누고 심벌당 간섭전력에 추정되는 전력만큼을 DPCCH 영역(TFCI, TPC, PILOT)을 이용해서 구한 (신호성분)2+ (간섭성분)2에서 상쇠시켜서 심벌당 평균 신호전력을 구한다. 마지막으로 심벌에 해당하는 신호전력을 간섭전력으로 나누면 신호전력 대 간섭전력비를 구할 수 있다. 이와 같은 기법을 사용하기 위해서는 트래픽(traffic) 채널과 파일롯 채널에 사용하는 확산 요소(spreading factor)가 다르더라도, 언제나 트래픽 채널에서 사용하는 확산 요소를 기준으로 공통(common) 파일롯 채널을 이용하여 심벌 당 평균 간섭신호를 구하여 적용하면 된다.First, an average is taken to eliminate (signal component) (interference component). Then only (Signal Component) 2 and (Interference Component) 2 remain. In this case, the signal power and the interference power are estimates corresponding to one symbol. Then, to eliminate the interference power per symbol, obtain an interference power estimate corresponding to the power control group using the pilot channel proposed by Qualcomm, divide it by the number of symbols and divide the estimated power by the interference power per symbol into the DPCCH region. The average signal power per symbol is obtained by canceling from (Signal Component) 2 + (Interference Component) 2 obtained using (TFCI, TPC, PILOT). Finally, the signal power corresponding to the symbol is divided by the interference power to obtain the signal power to interference power ratio. In order to use this technique, although the spreading factor used for the traffic channel and the pilot channel is different, it is always possible to use a common pilot channel based on the spreading factor used in the traffic channel. The average interference signal can be obtained and applied.

한편 본 발명의 상세한 설명에서는 구체적인 실시 예에 관해 설명하였으나, 본 발명의 범위에서 벗어나지 않는 한도 내에서 여러 가지 변형이 가능함은 물론이다. 그러므로 본 발명의 범위는 설명된 실시 예에 국한되어 정해져서는 안되며 후술하는 특허청구의 범위뿐 만 아니라 이 특허청구의 범위와 균등한 것들에 의해 정해져야 한다.Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

상술한 바와 같이 본 발명은 TPCI, TPC, 파일롯 심벌을 이용하여 신호 전력을 구함으로써 파일롯 심벌만을 이용할 때 보다 신호 전력 추정치의 정확도가 높아서 순방향 전력제어 성능을 향상시키는 장점이 있다. 또한 CDMA 기술의 가장 큰 맹점인 간섭 효과를 줄이는 결과를 가져오는 바, 셀 용량을 증대시킬 수 있는 장점도 있다.As described above, the present invention obtains signal power using TPCI, TPC, and pilot symbols, thereby improving forward power control performance because the signal power estimation accuracy is higher than using only pilot symbols. It also reduces cell interference, which is the biggest blind spot of CDMA technology.

Claims (2)

순방향 전력 제어를 위한 이동 통신 단말기의 수신신호 대 간섭 비율 측정 장치에 있어서,A reception signal to interference ratio measuring apparatus of a mobile communication terminal for forward power control, 레이크 수신기와,With rake receiver, 전력 계산을 위한 제곱기와,A squarer for power calculation, 평균 심볼 전력을 구하기 위한 평균기와,An average for obtaining average symbol power, 간섭신호를 제거하는 덧셈기로 구성됨을 특징으로 하는 장치.Apparatus comprising an adder for removing the interference signal. 제1항에 있어서,The method of claim 1, 처리되는 프레임이 데이터 필드와 제어 필드가 시간 다중화 되어 있음을 특징으로 하는 장치.The frame to be processed is characterized in that the data field and the control field is time multiplexed.
KR10-2000-0049263A 2000-08-24 2000-08-24 Signal to interference ratio measurement apparatus for downlink power control in mobile communication terminal equipment and method thereof KR100369657B1 (en)

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