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WO2012075759A1 - Procédé et système pour la réalisation d'estimation de canal de transmission en liaison descendante - Google Patents

Procédé et système pour la réalisation d'estimation de canal de transmission en liaison descendante Download PDF

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Publication number
WO2012075759A1
WO2012075759A1 PCT/CN2011/072499 CN2011072499W WO2012075759A1 WO 2012075759 A1 WO2012075759 A1 WO 2012075759A1 CN 2011072499 W CN2011072499 W CN 2011072499W WO 2012075759 A1 WO2012075759 A1 WO 2012075759A1
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WO
WIPO (PCT)
Prior art keywords
base station
dedicated
dedicated sounding
sounding signal
sequence
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2011/072499
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English (en)
Chinese (zh)
Inventor
王军虎
王衍文
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZTE Corp
Original Assignee
ZTE Corp
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Filing date
Publication date
Application filed by ZTE Corp filed Critical ZTE Corp
Publication of WO2012075759A1 publication Critical patent/WO2012075759A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H04L25/0228—Channel estimation using sounding signals with direct estimation from sounding signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0204—Channel estimation of multiple channels

Definitions

  • the present invention relates to a Time Division Duplex (TDD) system in the field of mobile communications, and in particular, to a method and system for implementing downlink channel estimation.
  • TDD Time Division Duplex
  • CoMP Coordinated Multi-point Transmission
  • CS coordinated coordinated Scheduling
  • CB Coordinated Beamforming
  • CSI Channel Situation Information
  • a prominent feature of coordinated multi-point transmission is the interaction of channel state information between multiple cooperative nodes.
  • LTE Long Term Evolution
  • the mobile terminal sends channel state information to provide services to itself.
  • the service node is forwarded to the cooperative node through the backhaul link. Therefore, not only the feedback overhead is excessive, but also the channel state information is invalid due to the delay of the backhaul link.
  • the uplink and downlink use the same frequency resource, so the uplink and downlink channels are symmetric, and the downlink channel estimation can be implemented by estimating the uplink channel.
  • the sounding is that the mobile terminal sends a sounding signal, and the eNB directly measures the sounding signal. Line channel estimation.
  • the sounding signal can simplify the mechanism of uplink channel feedback, and each cooperative node can realize downlink channel estimation through channel reciprocity.
  • the uplink sounding signal is limited to the user equipment (UE, User Equipment) communicating with the serving cell, that is, the sounding signal sent by the UE of the coordinated cell cannot be received by the base station of other cells; but in the CoMP system, If the sounding signal sent by the UE can be received by all base stations, and the sounding sequence is selected only by the monthly service base station in the sounding sequence pool, the UEs of different cells may send the same soungding signal, resulting in a sounding reference signal (SRS). , Sounding Reference Signal ) interference.
  • SRS Sounding Reference Signal
  • the main object of the present invention is to provide a method and system for implementing downlink channel estimation, which implements estimation of a downlink channel.
  • the present invention provides a method for implementing downlink channel estimation, including:
  • the serving base station authorizes the terminal in the multi-point cooperation state to issue a dedicated probe (a sounding M message, and the serving base station transmits the authorization information to the cooperative base station;
  • the terminal in the multi-point cooperation state After receiving the authorization of the serving base station, the terminal in the multi-point cooperation state sends a dedicated sounding signal;
  • the serving base station receives the dedicated sounding signal
  • the cooperative base station receives the dedicated sounding signal according to the authorization information
  • the serving base station and the cooperative base station perform downlink channel estimation according to the dedicated sounding signal.
  • the serving base station authorizes the terminal in the multi-point cooperation state to issue a dedicated sounding signal:
  • the serving base station uses the control information to authorize the terminal in the multi-point cooperation state to issue a dedicated sounding signal; wherein the dedicated sounding signal is obtained by modulating a dedicated sounding sequence, the control information includes Multi-point collaboration Number and location of resources dedicated sounding sequence given 1 J bad need of the terminal state to transmit a dedicated pilot signal sounding.
  • the dedicated sounding signal is a signal that can be recognized by both the serving base station and the cooperative base station
  • the dedicated sounding sequence is a sounding sequence selected in an existing sounding sequence pool, and the sounding sequence is used exclusively.
  • the serving base station sends the authorization information to the cooperative base station:
  • the serving base station sends the authorization information to the cooperative base station through the backhaul link, and the authorization information includes the time-frequency resource location of the dedicated sounding signal and the sequence number of the dedicated sounding sequence.
  • the terminal in the multi-point cooperation state sends a dedicated sounding signal to: the terminal in the multi-point cooperation state finds a corresponding dedicated sounding in the dedicated sounding sequence group according to the sequence number of the dedicated sounding sequence in the control information. a sequence, modulating the dedicated sounding sequence to obtain a dedicated sounding signal, and issuing a dedicated sounding signal according to a time-frequency resource position of the dedicated sounding signal in the control information.
  • the cooperative base station receives a dedicated sounding signal according to the authorization information, and the cooperative base station performs downlink channel estimation according to the dedicated sounding signal:
  • the cooperative base station acquires, according to the time-frequency resource location of the dedicated sounding signal and the sequence number of the dedicated sounding sequence in the authorization information, a dedicated sounding corresponding to the sequence number of the dedicated sounding sequence 1 J at a specified time and a specified frequency band.
  • Signaling correlating the dedicated sounding signal with a sounding signal formed by a local sounding sequence without channel fading to obtain an uplink channel function, and performing downlink channel estimation according to the uplink channel function.
  • the present invention also provides a system for implementing downlink channel estimation, including: a serving base station, a terminal in a coordinated multi-point state, and a cooperative base station;
  • a serving base station configured to authorize a terminal in a coordinated multi-point state to issue a dedicated sounding signal, and simultaneously send the authorization information to the cooperative base station; and is further configured to receive a dedicated sounding signal, and according to Dedicated sounding signal for downlink channel estimation;
  • the terminal in the multi-point cooperation state is configured to send a dedicated sounding signal after receiving the authorization of the serving base station;
  • the cooperative base station is configured to receive a dedicated sounding signal according to the authorization information sent by the serving base station, and perform downlink channel estimation according to the dedicated sounding signal.
  • the serving base station authorizes the terminal in the multi-point cooperation state to issue a dedicated sounding signal:
  • the serving base station uses the control information to authorize the terminal in the coordinated state to issue a dedicated sounding signal;
  • the dedicated sounding signal is a signal that can be recognized by both the serving base station and the cooperative base station, by performing a dedicated sounding sequence.
  • the dedicated sounding sequence is a set of sounding sequences selected in an existing sounding sequence pool, and the sounding sequence is a dedicated sounding sequence group dedicated for multi-cell cooperative transmission;
  • the control information includes The terminal in the multi-point cooperation state issues the time-frequency resource location of the dedicated sounding signal and the sequence number of the dedicated sounding sequence to be issued.
  • the serving base station sends the authorization information to the cooperative base station as:
  • the serving base station sends the authorization information to the cooperative base station through the backhaul link, and the authorization information includes the time-frequency resource location of the dedicated sounding signal and the sequence number of the dedicated sounding sequence.
  • the cooperative base station receives a dedicated sounding signal according to the authorization information sent by the serving base station, and performs downlink channel estimation according to the dedicated sounding signal:
  • the cooperative base station acquires, according to the time-frequency resource location of the dedicated sounding signal and the sequence number of the dedicated sounding sequence in the authorization information, a dedicated sounding corresponding to the sequence number of the dedicated sounding sequence 1 J at a specified time and a specified frequency band.
  • Signaling correlating the dedicated sounding signal with a sounding signal formed by a local sounding sequence without channel fading to obtain an uplink channel function, and performing downlink channel estimation according to the uplink channel function.
  • the service base station authorization is at most The terminal in the coordinated state sends a dedicated sounding signal, and the serving base station sends the authorization information to the cooperative base station; after receiving the authorization of the serving base station, the terminal in the coordinated state sends a dedicated sounding signal; the serving base station receives the dedicated sounding signal, and cooperates The base station receives the dedicated sounding signal according to the authorization information, and the serving base station and the cooperative base station perform downlink channel estimation according to the dedicated sounding signal, so that the cooperative base station can identify the dedicated sounding signal of the serving base station, and perform downlink channel estimation according to the dedicated sounding signal, so The base station and the cooperative base station can implement the downlink channel estimation, and the information exchange of the downlink channel estimation is no longer needed, thereby reducing the feedback overhead and avoiding the problem of information failure caused by the delay of the backhaul link.
  • Equipped with a set of dedicated sounding sequence groups each time a dedicated sounding signal is sent, a dedicated sounding sequence is specified in the sequence group to obtain a dedicated sounding signal, thus avoiding terminal transmissions of different cells.
  • the same dedicated sounding signal so as to avoid mutual interference between the terminals of different cell-specific sounding signal emitted.
  • FIG. 1 is a schematic flow chart of a method for implementing downlink channel estimation according to the present invention
  • FIG. 2 is a schematic diagram of multi-cell cooperative transmission in the present invention
  • FIG. 3 is a schematic flowchart of Embodiment 1 of a method for implementing downlink channel estimation according to the present invention
  • FIG. 4 is a timing diagram of a multi-terminal transmitting a dedicated sounding signal according to Embodiment 1 of the present invention
  • FIG. 5 is a schematic diagram of an uplink channel according to Embodiment 1 of the present invention.
  • FIG. 6 is a schematic diagram of estimating an uplink channel in Embodiment 1 of the present invention.
  • FIG. 7 is a schematic structural diagram of a system for implementing downlink channel estimation according to the present invention. detailed description
  • the basic idea of the present invention is that the serving base station authorizes the terminal in the multi-point cooperation state to issue a dedicated sounding signal, and the serving base station transmits the authorization information to the cooperative base station; After the authorization of the base station, the terminal in the multi-point cooperation state sends a dedicated sounding signal; the serving base station receives the dedicated sounding signal, and the cooperative base station receives the dedicated sounding signal according to the authorization information, and the serving base station and the cooperative base station perform downlink channel estimation according to the dedicated sounding signal.
  • FIG. 1 is a schematic flowchart of a method for implementing downlink channel estimation according to the present invention. As shown in FIG. 1, the method includes the following steps:
  • Step 101 The serving base station authorizes the terminal in the multi-point cooperation state to send a dedicated sounding signal, and the serving base station sends the authorization information to the cooperative base station.
  • the serving base station authorizes the terminal in the multi-point cooperation state to issue a dedicated sounding signal during the authorization time of the serving base station; wherein the multi-point cooperation state refers to being at the edge of multiple cells, and capable of implementing multi-cell coordinated transmission.
  • the dedicated sounding signal is a signal that can be recognized by both the monthly service base station and the cooperative base station, and can obtain a dedicated sounding signal by modulating a dedicated sounding sequence for performing multi-cell cooperative transmission, and the dedicated sounding of the multi-cell cooperative transmission
  • the sequence may select a set of sounding sequences in the existing sounding sequence pool, and use the sounding sequence as a dedicated sounding sequence group dedicated for multi-cell cooperative transmission;
  • the authorization refers to the serving base station sending control information to The terminal in the multi-point cooperation state, the control information includes a time-frequency resource location in which the terminal in the multi-point cooperation state issues a dedicated sounding signal, and a sequence number of a dedicated sounding sequence 1 J to be issued in the dedicated sounding sequence group;
  • the serving base station authorizes the terminal in the multi-point cooperation state to send the dedicated sounding signal, and the serving base station sends the authorization information to the cooperative base station through the backhaul link; wherein the authorization information includes the time-frequency resource location of the dedicated sounding signal and the sequence number of the dedicated sounding sequence. .
  • Step 102 After receiving the authorization of the serving base station, the terminal in the multi-point cooperation state sends a dedicated sounding signal; Specifically, after receiving the control information sent by the serving base station, the terminal in the multi-point cooperation state finds a corresponding dedicated sounding sequence in the dedicated sounding sequence group according to the sequence number of the dedicated sounding sequence carried in the control information, and finds the dedicated The sounding sequence is modulated to obtain a dedicated sounding signal; the terminal in the multi-point cooperation state is based on the time-frequency resource position of the dedicated sounding signal carried in the control information, the time specified in the time-frequency resource position of the dedicated sounding signal, and the specified In the frequency band, a dedicated sounding signal is sent in a certain order on its own multiple antennas; for example, as shown in FIG. 2, after receiving the control information of the base station 1, the terminal UE located at the edge of the cell 1 and the cell 2 issues a dedicated sounding signal.
  • the dedicated sounding signals from multiple antennas may be the same or different.
  • Step 103 The serving base station receives a dedicated sounding signal, and the cooperative base station receives a dedicated sounding signal according to the authorization information, and the serving base station and the cooperative base station perform downlink channel estimation according to the dedicated sounding signal;
  • the serving base station receives the dedicated sounding signal sent by the terminal, and after receiving the authorization information sent by the serving base station, the cooperative base station, according to the time-frequency resource location of the dedicated sounding signal in the authorization information and the sequence number of the dedicated sounding sequence, at the specified time And obtaining, in the specified frequency band, a dedicated sounding signal corresponding to the sequence number of the dedicated sounding sequence in the authorization information; the serving base station and the cooperative base station respectively receive the received dedicated sounding signal and the sounding signal formed according to the local sounding sequence without channel fading Perform correlation operations to obtain an estimate of the uplink channel function;
  • FIG. 3 is a schematic flowchart of Embodiment 1 of a method for implementing downlink channel estimation according to the present invention. As shown in FIG. 3, the embodiment includes the following steps:
  • Step 301 The serving base station authorizes the UE1 to send a dedicated sounding signal, and the serving base station sends the authorization information to the cooperative base station.
  • Step 302 After receiving the authorization of the serving base station, UE1 sends a dedicated sounding signal. Specifically, as shown in FIG. 4, after receiving the authorization of the serving base station, UE1 alternately sends a dedicated sounding signal on its two antennas; The timing of the dedicated sounding signal sent by the UE2 is interleaved with the timing at which the UE1 issues a dedicated sounding signal, where the UE2 is a terminal that cooperates with the UE1 in the coordinated cell.
  • Step 303 The serving base station receives the dedicated sounding signal, and the cooperative base station receives the dedicated sounding signal according to the authorization information, and the serving base station and the cooperative base station perform downlink channel estimation according to the dedicated sounding signal.
  • the serving base station of the UE1 that is, the base station 1
  • the cooperative base station of the UE1, that is, the base station 2 acquires the UE1.
  • the two antennas transmit a dedicated sounding signal in turn, thereby obtaining an uplink channel function H12;
  • the serving base station of the UE2, that is, the base station 2 receives the dedicated sounding signal sent by the two antennas of the UE2 in turn, and obtains the uplink channel function H21; the cooperative base station of the UE2, that is, the base station 1, acquires the dedicated sounding signal sent by the two antennas of the UE2 in turn. Obtaining an uplink channel function H22;
  • the uplink channel corresponding to mi is shown in FIG. 6.
  • UEi has antenna a and antenna b
  • base station 1 has antenna 1 to antenna 4.
  • the matrix of uplink channel function H11 is:
  • the uplink channel function HI 1 is converted into a downlink channel function, so that both the serving base station and the cooperative base station can obtain the downlink channel estimation, and the matrix of the downlink channel function is:
  • FIG. 7 is a schematic structural diagram of a system for implementing downlink channel estimation according to the present invention.
  • the system includes: a serving base station 71, at multiple points. a terminal 72 in cooperation state, a cooperative base station 73; wherein
  • the serving base station 71 is configured to authorize the terminal 72 in the multi-point cooperation state to send a dedicated sounding signal, and simultaneously transmit the authorization information to the cooperative base station 73; and also to receive the dedicated sounding signal, and perform downlink channel estimation according to the dedicated sounding signal;
  • the terminal 72 in the multi-point cooperation state is configured to send a dedicated sounding signal after receiving the authorization of the serving base station 71;
  • the cooperative base station 73 is configured to receive a dedicated sounding signal according to the authorization information sent by the serving base station 71, and perform downlink channel estimation according to the dedicated sounding signal.
  • the serving base station 71 authorizes the terminal 72 in the coordinated multi-point state to issue a dedicated sounding signal to:
  • the serving base station 71 authorizes the terminal 72 in the coordinated state to issue a dedicated sounding signal by using the control information;
  • the dedicated sounding signal is a signal that both the serving base station and the cooperative base station can recognize, and is dedicated to The sounding sequence is modulated by the sounding sequence;
  • the dedicated sounding sequence is a set of sounding sequences selected in the existing sounding sequence pool, and the sounding sequence is a dedicated sounding sequence group specially used for multi-d, zone cooperative transmission;
  • the control information includes a time-frequency resource location in which the terminal in the multi-point cooperation state issues a dedicated sounding signal and a sequence number of the dedicated sounding sequence to be issued.
  • the serving base station 71 sends the authorization information to the cooperative base station 73.
  • the serving base station 71 sends the authorization information to the cooperative base station 73 through the backhaul link, where the authorization information includes the time-frequency resource location of the dedicated sounding signal and the sequence number of the dedicated sounding sequence.
  • the cooperative base station 73 receives a dedicated sounding signal according to the authorization information sent by the serving base station 71, and performs downlink channel estimation according to the dedicated sounding signal:
  • the cooperative base station 73 acquires, according to the time-frequency resource location of the dedicated sounding signal and the sequence number of the dedicated sounding sequence in the authorization information, a dedicated number corresponding to the serial number of the dedicated sounding sequence 1 J at a specified time and a specified frequency band. a sounding signal; correlating the dedicated sounding signal with a sounding signal formed by a local sounding sequence without channel fading to obtain an uplink channel function, and performing downlink channel estimation according to the uplink channel function.

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

Abstract

La présente invention concerne un procédé pour la réalisation d'estimation de canal de transmission en liaison descendante, comprenant les étapes suivantes: une station de base de desserte autorise un terminal dans un état multipoint coordonné à transmettre un signal de sondage dédié, et la station de base de desserte transmet l'information d'autorisation à une station de base coordonnée (101) ; suite à l'obtention de l'autorisation de la station de base de desserte, le terminal dans l'état multipoint coordonné transmet le signal de sondage spécialisé (102) ; la station de base de desserte reçoit le signal de sondage dédié, la station de base coordonnée reçoit le signal de sondage dédié selon l'information d'autorisation, et la station de base de desserte et la station de base coordonnée effectuent une estimation de canal de transmission en liaison descendante en fonction du signal de sondage dédié (103). L'invention concerne également un système pour la réalisation d'estimation de canal de transmission en liaison descendante. Une estimation de canal de transmission en liaison descendante peut être réalisée sur la base de la solution technique selon l'invention.
PCT/CN2011/072499 2010-12-10 2011-04-07 Procédé et système pour la réalisation d'estimation de canal de transmission en liaison descendante Ceased WO2012075759A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2010105852921A CN102571645A (zh) 2010-12-10 2010-12-10 一种实现下行信道估计的方法及系统
CN201010585292.1 2010-12-10

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WO2012075759A1 true WO2012075759A1 (fr) 2012-06-14

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CN103634033B (zh) * 2012-08-23 2018-11-23 南京中兴新软件有限责任公司 协作多点传输衰落信道的产生方法及装置

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CN101621813A (zh) * 2009-07-23 2010-01-06 北京航空航天大学 一种面向下行相干协作多点传输的上行信道估计方法
CN101714897A (zh) * 2009-11-12 2010-05-26 普天信息技术研究院有限公司 探测参考信号的配置方法
CN101841921A (zh) * 2010-04-29 2010-09-22 北京邮电大学 协作多点场景下信道探测导频的发送方法

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CN101848541B (zh) * 2009-03-27 2013-03-13 电信科学技术研究院 一种探测参考信号发送的方法及设备
CN101867938B (zh) * 2009-04-20 2013-01-02 电信科学技术研究院 一种用于多点协同传输的上行参考信号的配置方法和装置

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Publication number Priority date Publication date Assignee Title
CN101621813A (zh) * 2009-07-23 2010-01-06 北京航空航天大学 一种面向下行相干协作多点传输的上行信道估计方法
CN101714897A (zh) * 2009-11-12 2010-05-26 普天信息技术研究院有限公司 探测参考信号的配置方法
CN101841921A (zh) * 2010-04-29 2010-09-22 北京邮电大学 协作多点场景下信道探测导频的发送方法

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