KR20030095634A - Feedback information transmit method for mobile communication system - Google Patents

Feedback information transmit method for mobile communication system Download PDF

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Publication number
KR20030095634A
KR20030095634A KR1020020032923A KR20020032923A KR20030095634A KR 20030095634 A KR20030095634 A KR 20030095634A KR 1020020032923 A KR1020020032923 A KR 1020020032923A KR 20020032923 A KR20020032923 A KR 20020032923A KR 20030095634 A KR20030095634 A KR 20030095634A
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South Korea
Prior art keywords
base station
fbi
feedback information
fbi field
mobile communication
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KR1020020032923A
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Korean (ko)
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KR100859325B1 (en
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심동희
조기형
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엘지전자 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
    • H04W52/06—TPC algorithms
    • H04W52/08—Closed loop power control
    • 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
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control
    • 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
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • 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
    • H04W52/38—TPC being performed in particular situations
    • H04W52/40—TPC being performed in particular situations during macro-diversity or soft handoff
    • 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
    • H04W52/54—Signalisation aspects of the TPC commands, e.g. frame structure
    • H04W52/58—Format of the TPC bits

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Transmission System (AREA)

Abstract

PURPOSE: A method for transmitting FBI(FeedBack Information) in a mobile communication system is provided to improve the receiving performance of a terminal by adjusting a power level of an FBI field for loading FBI when transmitting FBI to a base station. CONSTITUTION: A base station judges whether a closed-loop transmission diversity is used. If the closed-loop transmission diversity is used, the base station judges a power level of an FBI field of a DPCCH(Dedicated Physical Control CHannel). The base station transmits the judged power level of the FBI field to a terminal. The terminal adjusts a power level of the FBI field for loading and transmitting FBI to the base station with reference to the received power level of the FBI field.

Description

이동통신 시스템의 귀환 정보 전송 방법{FEEDBACK INFORMATION TRANSMIT METHOD FOR MOBILE COMMUNICATION SYSTEM}FEEDBACK INFORMATION TRANSMIT METHOD FOR MOBILE COMMUNICATION SYSTEM}

본 발명은 이동통신 시스템에 관한 것으로 특히, WCDMA 폐루프 송신 다이버시티(Diversity)에 있어서, 귀환 정보 전송 방법에 관한 것이다.The present invention relates to a mobile communication system, and more particularly, to a method for transmitting feedback information in WCDMA closed loop transmit diversity.

3GPP WCDMA 표준 규격에는 폐루프 송신 다이버시티를 지원하기 위해 uplink channel의 하나인 DPCCH를 통해 FBI를 전송하도록 규정되어 있다.The 3GPP WCDMA standard specifies that FBI is transmitted over DPCCH, which is one of uplink channels, to support closed loop transmit diversity.

WCDMA 시스템의 채널 구조를 도2의 예시도와 같다.The channel structure of the WCDMA system is shown in FIG.

도2에 도시된 바와 같이, 단말기로부터 기지국으로의 역방향 채널 중 DPCH는 DPCCH(Dedicated Physical Control CHannel)와 DPDCH(Dedicated Physical Data CHannel)로 구성된다.As shown in FIG. 2, the DPCH of the reverse channel from the terminal to the base station is composed of a Dedicated Physical Control CHannel (DPCCH) and a Dedicated Physical Data CHannel (DPDCH).

상기 DPCCH는 채널 정보를 추정하기 위한 파일롯 심볼(pilot)과, 역방향 채널의 SF(Spreading Factor) 정보 등을 포함하는 TFCI(Transport Format Combination Indicator)과, 단말기가 송신 다이버시티 등을 위한 정보를 실어 나르는 귀환 신호인 FBI(FeedBack Information)와, power control 정보를 포함하고 있는 TPC(Transmit Power Control)를 구비하여 구성된다.The DPCCH includes a pilot symbol for estimating channel information, a Transport Format Combination Indicator (TFCI) including spreading factor (SF) information of a reverse channel, and a terminal carrying information for transmission diversity and the like. And a feedback power control (TBI) including a feedback signal (FBI) and a power control information.

상기 DPDCH는 실질적인 사용자의 데이터가 실리는 채널이다.The DPDCH is a channel carrying actual user data.

상기 DPCCH와 DPDCH를 합하여(즉, DPCH = DPCCH + DPDCH) DPCH(Dedicated Physical Channel)라고 부른다.The sum of the DPCCH and the DPDCH (ie, DPCH = DPCCH + DPDCH) is called a dedicated physical channel (DPCH).

종래의 폐루프 송신 다이버시티 시스템은 도1의 구성도에 도시된 바와 같이구성된다.The conventional closed loop transmit diversity system is constructed as shown in the schematic diagram of FIG.

도1에서 '100'은 기지국의 송신단 회로로서, 각 안테나(Ant1)(Ant2)에 송신 다이버시티 적용을 위한 웨이트를 곱해주는 회로 부분을 구비하여 구성된다.In FIG. 1, '100' is a transmission circuit of a base station, and includes a circuit portion that multiplies each antenna Ant1 and Ant2 by a weight for transmission diversity application.

그리고, 각 안테나를 구분하기 위한 CPICH (Common Piot Channel) 가 각각의 안테나에서 달리 전송되어야 한다And, CPICH (Common Piot Channel) to distinguish each antenna should be transmitted differently in each antenna

도1에서 '200'은 단말기의 수신단 회로로서, 기지국 송신단 회로(100)에 구비된 안테나(Ant1)(Ant2)에서 전송된 CPICH를 추정하여 각각의 안테나(Ant1)(Ant2)에서 전송될 송신 신호에 곱해 줄 가중치(w1)(w2)를 계산하는 회로 부분을 구비하여 구성된다.In FIG. 1, '200' is a receiver circuit of a terminal, and estimates a CPICH transmitted from antennas Ant1 and Ant2 provided in a base station transmitter circuit 100 and transmits a signal to be transmitted from each antenna Ant1 and Ant2. And a circuit portion for calculating a weight w1 (w2) to be multiplied by.

이와같은 종래 기술에서의 동작 과정을 설명하면 다음과 같다.Referring to the operation process in the prior art as follows.

우선, WCDMA 시스템은 폐루프 송신 다이버시티를 지원하기 위해 단말기 수신단 회로(200)에서 채널의 상태를 측정하여 그 채널 상태에 따른 최적의 송신 가중치(w1)(w2)를 계산하고 이를 역방향 DPCCH의 FBI 필드에 실어 기지국 송신단 회로(100)로 귀환시키게 된다.First, the WCDMA system measures the state of a channel in the terminal receiver circuit 200 to support closed loop transmit diversity, calculates an optimal transmit weight (w1) (w2) according to the channel state, and calculates the FBI of the reverse DPCCH. The field is returned to the base station transmitter circuit 100.

이 경우, 단말기 수신단 회로(200)에서 계산한 가중치(w1)(w2)를 포함하는 귀환 정보를 실어 나르기 위한 FBI 필드는 항상 일정한 크기의 파워로 전송된다.In this case, the FBI field for carrying feedback information including the weights w1 and w2 calculated by the terminal receiver circuit 200 is always transmitted with a constant power.

이에 따라, 2개의 안테나(Ant1)(Ant2)를 구비한 기지국 송신단(100)은 단말기 수신단 회로(200)에서 계산한 가중치(w1)(w2)를 각 안테나(Ant1)(Ant2)에서 전송할 신호에 적용하여 송신함으로써 단말기에서의 수신 성능을 향상시키게 된다.Accordingly, the base station transmitter 100 having two antennas Ant1 and Ant2 transmits the weights w1 and w2 calculated by the terminal receiver circuit 200 to signals transmitted by each antenna Ant1 and Ant2. By applying and transmitting, the reception performance in the terminal is improved.

그러나, 종래에는 폐루프 송신 다이버시티를 지원하기 위해 단말기에서 계산한 가중치를 귀환하기 위한 FBI 필드가 항상 일정한 파워로 유지됨으로 채널 상태가 불량하여 귀환 정보가 정확히 전달되지 않으면 기지국의 각 안테나에 적용할 웨이트가 달라져서 원하는 성능을 기대할 수 없는 단점이 있다.However, in the related art, the FBI field for feedback of the weight calculated by the terminal is always maintained at a constant power to support closed-loop transmit diversity. Therefore, if the channel information is poor and the feedback information is not transmitted correctly, it is applicable to each antenna of the base station. There is a drawback that you cannot expect the desired performance because the weight is changed.

즉, 종래에는 채널 상태가 불량하여 단말기에서 계산한 가중치가 기지국으로 정확히 전달되지 않으면 그 가중치의 오류로 인해 송신 다이버시티를 사용하는 경우 송신 다이버시티를 사용하지 않는 경우보다 더욱 나쁜 통신 상태를 초래하여 단말기의 수신 성능을 저하시키는 단점이 있다.That is, in the related art, when the weight calculated by the terminal is not correctly transmitted to the base station because the channel state is poor, when the transmit diversity is used due to the error of the weight, a worse communication state is caused than when the transmit diversity is not used. There is a disadvantage in reducing the reception performance of the terminal.

따라서, 본 발명은 종래의 문제점을 개선하기 위하여 기지국으로 귀환 신호를 전송하는 경우 그 귀환 정보를 싣기 위한 FBI 필드의 파워 크기를 조정함으로써 단말기의 수신 성능을 향상시키도록 창안한 이동통신 시스템의 귀환 정보 전송 방법을 제공함에 목적이 있다.Accordingly, the present invention provides feedback information of a mobile communication system invented to improve the reception performance of a terminal by adjusting the power magnitude of an FBI field for loading feedback information when transmitting a feedback signal to a base station in order to improve a conventional problem. The purpose is to provide a transmission method.

도1은 종래의 폐루프 송신 다이버시티 시스템의 개략적인 구성도.1 is a schematic configuration diagram of a conventional closed loop transmit diversity system.

도2는 WCDMA 시스템의 채널 구조를 보인 예시도.2 is an exemplary view showing a channel structure of a WCDMA system.

도3은 본 발명의 실시예에서 DPCCH의 FBI 필드의 파워 크기를 보인 예시도.Figure 3 is an exemplary view showing the power size of the FBI field of the DPCCH in an embodiment of the present invention.

도4는 본 발명의 실시예에서 오프셋 정보 테이블의 예시도.4 is an exemplary diagram of an offset information table in an embodiment of the present invention.

* 도면의 주요부분에 대한 부호 설명 *Explanation of symbols on the main parts of the drawings

100 : 기지국 송신단 회로200 : 단말기 수신단 회로100: base station transmitter end circuit 200: terminal receiver end circuit

본 발명은 상기의 목적을 달성하기 위하여 WCDMA 폐루프 송신 다이버시티를 적용한 이동통신 시스템의 귀환 정보 전송 방법에 있어서,The present invention provides a method of transmitting feedback information in a mobile communication system using WCDMA closed loop transmit diversity in order to achieve the above object,

귀환 정보가 실리는 DPCCH의 FBI 필드의 파워 크기를 채널 상황에 적합하게 조정하도록 구성함을 특징으로 한다.It is characterized in that it is configured to adjust the power size of the FBI field of the DPCCH carrying feedback information according to the channel situation.

이를 위하여 본 발명은 기지국에서 폐루프 송신 다이버시티의 사용 여부를 판단하는 단계와, 상기에서 폐루프 송신 다이버시티의 사용으로 판단되면 기지국에서 DPCCH 채널의 FBI 필드의 파워 크기를 판단하는 단계와, 상기에서 판단된 FBI필드의 파워 크기를 기지국에서 단말기로 전송하는 단계와, 단말기가 상기에서 전송받은 FBI 필드의 파워 크기를 참조하여 기지국으로의 귀환 정보를 실어 나르기 위한 FBI 필드의 크기를 조정하는 단계로 이루어짐을 특징으로 한다.To this end, the present invention provides a method for determining whether to use closed loop transmit diversity in a base station, and, if it is determined that the closed loop transmit diversity is used, determining a power level of an FBI field of a DPCCH channel in the base station; And transmitting the power size of the FBI field determined from the base station to the terminal, and adjusting the size of the FBI field to carry feedback information to the base station with reference to the power size of the received FBI field. Characterized in that made.

이하, 본 발명을 도면에 의거 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in detail with reference to the drawings.

본 발명의 실시예에서는 본 발명의 요지를 불필요하게 흐릴 수 있는 공지 기능 및 구성에 대한 상세한 설명은 생략하기로 한다.In the embodiments of the present invention, a detailed description of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

본 발명의 실시예를 위한 시스템은 도1의 종래 기술과 동일하게 구성한다.The system for an embodiment of the present invention is configured in the same manner as the prior art of FIG.

이와같이 구성한 본 발명의 실시예에 대한 동작 및 작용 효과를 설명하면 다음과 같다.Referring to the operation and effect of the embodiment of the present invention configured as described above are as follows.

기지국은 단말기가 파워를 온시킨 초기에 폐루프 송신 다이버시티의 사용으로 판단하면 상기 단말기에서 귀환되는 DPCCH 채널의 파워 크기과 그 DPCCH 채널에 구비된 FBI 필드의 파워 크기가 어느 정도 차이가 나는지 상위 계층의 신호(signaling)를 이용하여 계산한다.When the base station determines that the terminal uses the closed-loop transmit diversity at the initial stage of power-on, the base layer determines how much the power size of the DPCCH channel returned from the terminal differs from that of the FBI field provided in the DPCCH channel. Calculate using signaling.

이후, 기지국은 상기에서 계산된 DPCCH와 FBI 필드의 파워 차이를 고려하여 FBI 필드의 파워 크기를 결정하고 이를 RRC signaling을 통해 단말기로 전송한다.Then, the base station determines the power size of the FBI field in consideration of the power difference between the DPCCH and the FBI field calculated above and transmits it to the terminal through RRC signaling.

이때, 기지국에서 결정된 FBI 필드의 파워 크기는 DPCCH에서 사용하는 파워에 대해 상대적인 크기로서, 이 FBI 필드의 파워 크기는 오프셋(offset) 정보로 표현할 수 있다.In this case, the power size of the FBI field determined by the base station is relative to the power used in the DPCCH, and the power size of the FBI field may be expressed by offset information.

상기 오프셋 정보는 제조업체에서 미리 실험적으로 산출하며 이를 기지국에 도4의 예시도와 같은 테이블로 저장하게 된다.The offset information is experimentally calculated by the manufacturer in advance and stored in a table as shown in the example of FIG.

이에 따라, 기지국에서는 DPCCH와 FBI 필드의 파워 크기의 차이에 대응하는 오프셋 정보를 도4의 예시도와 같은 테이블로부터 쉽게 확인하여 단말기로 전송하게 된다.Accordingly, the base station easily checks the offset information corresponding to the difference between the power sizes of the DPCCH and the FBI field from the table as shown in FIG.

이후, 단말기 수신단 회로(200)는 기지국 송신단 회로(100)에 구비된 각각의 안테나(Ant1)(Ant2)에서 전송할 신호에 대한 가중치(w1)(w2)를 상기 기지국 송신단 회로(100)로 귀환시킬 때 기지국 송신단 회로(100)에서 전송된 FBI 필드의 파워 크기를 참조하여 DPCCH 채널 중 FBI 필드의 파워 크기를 조정하게 된다.Subsequently, the terminal receiver circuit 200 returns a weight w1 (w2) for a signal to be transmitted by each antenna Ant1 (Ant2) included in the base station transmitter circuit 100 to the base station transmitter circuit 100. When the base station transmitter circuit 100 adjusts the power size of the FBI field in the DPCCH channel by referring to the power size of the FBI field.

즉, 단말기 수신단 회로(200)에서 기지국 송신단 회로(100)으로 귀환 신호를 전송할 때 DPCCH에 구비되는 FBI 필드의 파워 크기를 도3의 예시도와 같이 조정하는 것이다.That is, when the feedback signal is transmitted from the terminal receiver circuit 200 to the base station transmitter circuit 100, the power size of the FBI field included in the DPCCH is adjusted as illustrated in FIG.

따라서, 기지국 송신단 회로(100)는 단말기 수신단 회로(200)에서 전송된 가중치(w1)(w2)가 실린 DPCCH의 FBI 필드를 정확히 수신하여 그 가중치(w1)(w2)를 각 안테나(Ant1)(Ant2)에서 전송할 신호에 적용함으로써 단말기에서의 수신 성능을 향상시키게 된다.Accordingly, the base station transmitter circuit 100 correctly receives the FBI field of the DPCCH carrying the weights w1 (w2) transmitted from the terminal receiver circuit 200, and transmits the weights w1 (w2) to the respective antennas Ant1 ( By applying to the signal to be transmitted in Ant2) it is possible to improve the reception performance in the terminal.

상기에서 상세히 설명한 바와 같이 본 발명은 단말기에서 계산한 가중치를 기지국으로 귀환시킬 때 그 귀환 정보를 실어 나르는 DPCCH 채널 중 FBI 필드의 파워 크기를 조절함으로써 기지국에서 안정적으로 가중치를 수신하도록 하여 단말기의 수신 성능을 향상시키는 효과가 있다.As described in detail above, the present invention adjusts the power size of the FBI field of the DPCCH channel carrying the feedback information when the weight calculated by the terminal is returned to the base station so that the base station can receive the weight stably so that the base station receives the weight. Has the effect of improving.

Claims (5)

WCDMA 폐루프 송신 다이버시티를 적용한 이동통신 시스템의 귀환 정보 전송 방법에 있어서,In the feedback information transmission method of a mobile communication system to which WCDMA closed loop transmit diversity is applied, 귀환 정보가 실리는 DPCCH의 FBI 필드의 파워 크기를 채널 상황에 적합하게 조정하도록 구성하는 것을 특징으로 하는 이동통신 시스템의 귀환 정보 전송 방법.And adjusting the power size of the FBI field of the DPCCH carrying feedback information according to a channel condition. 제1항에 있어서, FBI 필드의 파워 크기는The method of claim 1, wherein the power magnitude of the FBI field is 귀환 정보를 전송할 DPCCH의 파워 크기에 대해 상대적으로 크게 조정하는 것을 특징으로 하는 이동통신 시스템의 귀환 정보 전송 방법.A feedback information transmission method of a mobile communication system, characterized in that the feedback information is largely adjusted relative to the power size of the DPCCH. WCDMA 폐루프 송신 다이버시티를 적용한 이동통신 시스템의 귀환 정보 전송 방법에 있어서,In the feedback information transmission method of a mobile communication system to which WCDMA closed loop transmit diversity is applied, 기지국에서 폐루프 송신 다이버시티의 사용 여부를 판단하는 제1 단계와,A first step of determining whether the base station uses closed loop transmit diversity; 상기에서 폐루프 송신 다이버시티의 사용으로 판단되면 기지국에서 DPCCH 채널의 FBI 필드의 파워 크기를 판단하는 제2 단계와,A second step of determining, by the base station, the power magnitude of the FBI field of the DPCCH channel if it is determined that the closed loop transmit diversity is used; 상기에서 판단된 FBI 필드의 파워 크기를 기지국에서 단말기로 전송하는 제3 단계와,A third step of transmitting the power size of the FBI field determined from the base station to the terminal; 단말기가 상기에서 전송받은 FBI 필드의 파워 크기를 참조하여 기지국으로의 귀환 정보를 실어 나르기 위한 FBI 필드의 크기를 조정하는 제4 단계로 이루어짐을특징으로 하는 이동통신 시스템의 귀환 정보 전송 방법.And a fourth step of adjusting, by the terminal, the size of the FBI field for carrying feedback information to the base station with reference to the power size of the received FBI field. 제3항에 있어서, 제3 단계에서 전송되는 FBI 필드의 파워 크기는The power magnitude of the FBI field transmitted in the third step is DPCCH의 파워 크기에 상대적인 FBI 필드의 파워 크기를 고려한 오프셋 정보임을 특징으로 하는 이동통신 시스템의 귀환 정보 전송 방법.The feedback information transmission method of the mobile communication system, characterized in that the offset information considering the power size of the FBI field relative to the power size of the DPCCH. 제3항에 있어서, 제3 단계에서 전송되는 FBI 필드의 파워 크기는The power magnitude of the FBI field transmitted in the third step is RRC signaling을 통해 전송하는 것을 특징으로 하는 이동통신 시스템의 귀환 정보 전송 방법.Feedback information transmission method of a mobile communication system, characterized in that the transmission through the RRC signaling.
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WO2008054142A1 (en) * 2006-10-31 2008-05-08 Lg Electronics Inc. Method for transmitting feedback information
KR101029812B1 (en) * 2004-10-18 2011-04-18 엘지전자 주식회사 Method of feedback of MIMO mode and permutation type in OFDM/OFDMA mobile communications system

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KR100316777B1 (en) * 1999-08-24 2001-12-12 윤종용 Closed loop transmit antenna diversity method, base station apparatus and mobile station apparatus therefor in next generation mobile communication system
WO2002030009A1 (en) * 2000-10-04 2002-04-11 Samsung Electronics Co., Ltd. Apparatus and method for power control of downlink shared channel in mobile communication system
KR100735402B1 (en) * 2000-11-07 2007-07-04 삼성전자주식회사 Apparatus and Method of Transmission Transmit Format Combination Indicator for Downlink Shared Channel in Asynchronous Mobile Communication System
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KR101029812B1 (en) * 2004-10-18 2011-04-18 엘지전자 주식회사 Method of feedback of MIMO mode and permutation type in OFDM/OFDMA mobile communications system
WO2008054142A1 (en) * 2006-10-31 2008-05-08 Lg Electronics Inc. Method for transmitting feedback information
US8432819B2 (en) 2006-10-31 2013-04-30 Lg Electronics Inc. Method for transmitting feedback information
KR101403105B1 (en) * 2006-10-31 2014-06-09 엘지전자 주식회사 Method for transmitting feedback data, method for generating feedback data and method for scheduling data

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