WO2011025177A2 - 무선통신시스템에서 상향링크 광대역 측정 신호를 이용한 하향링크 채널 정보 전송 방법과 장치, 및 그를 이용한 하향링크 채널정보 획득방법과 장치 - Google Patents
무선통신시스템에서 상향링크 광대역 측정 신호를 이용한 하향링크 채널 정보 전송 방법과 장치, 및 그를 이용한 하향링크 채널정보 획득방법과 장치 Download PDFInfo
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- WO2011025177A2 WO2011025177A2 PCT/KR2010/005463 KR2010005463W WO2011025177A2 WO 2011025177 A2 WO2011025177 A2 WO 2011025177A2 KR 2010005463 W KR2010005463 W KR 2010005463W WO 2011025177 A2 WO2011025177 A2 WO 2011025177A2
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- downlink channel
- signal
- channel information
- base station
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
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- 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
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03891—Spatial equalizers
- H04L25/03898—Spatial equalizers codebook-based design
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
- H04L5/0035—Resource allocation in a cooperative multipoint environment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
- H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- H04L5/0057—Physical resource allocation for CQI
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- 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
- H04L25/0226—Channel estimation using sounding signals sounding signals per se
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- 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
- H04L25/024—Channel estimation channel estimation algorithms
- H04L25/0242—Channel estimation channel estimation algorithms using matrix methods
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- 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
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03891—Spatial equalizers
- H04L25/03949—Spatial equalizers equalizer selection or adaptation based on feedback
- H04L25/03955—Spatial equalizers equalizer selection or adaptation based on feedback in combination with downlink estimations, e.g. downlink path losses
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0023—Time-frequency-space
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
Definitions
- the present disclosure relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting downlink channel information using an uplink broadband measurement signal, and a method and apparatus for obtaining downlink channel information using the same.
- communication service providers are continuously attempting to expand the existing communication service market by creating a new communication service market for wireless terminals and providing reliable and inexpensive services.
- a wireless communication system it is basically required to estimate a state of a downlink channel in a downlink environment in which a base station or the like transmits data to a terminal.
- a codebook to deliver downlink channel information through a small feedback overhead. Specifically, a few representative types of channels are selected, a precoder suitable for a selected channel type is selected, a codeword representing each selected channel type or a precoder to be used is created and a codeword is selected. Design a codebook made of code. After estimating the downlink channel, the terminal searches the codebook to extract the most suitable codeword, and then transmits it with the control signal or the information signal transmitted in the uplink. That is, in the closed loop transmission scheme, the receiver instructs a specific codeword or precoding vector among predefined codebooks according to the received signal, and feeds back channel information according to the received signal. Will be sent.
- a terminal since a terminal can transmit an information signal or a control signal, there is only one base station.
- a multi-point cooperative transmission / reception system in which a terminal communicates using a plurality of base stations (Coordinated multi-point transmission / Not only suitable for a reception system (CoMP), but also to transmit accurate downlink channel information to a base station, channel information must be represented using many bits, thus requiring a large feedback overhead.
- LTE-A Long Term Evolution-Advanced
- MIMO Multiple Access Interference
- the present specification discloses a method and apparatus for transmitting downlink channel information to two or more base stations by a terminal using an uplink wideband measurement signal in a wireless communication system.
- a method for simultaneously transmitting downlink channel information to two or more base stations the terminal obtaining the downlink channel information (CSI) of each base station; And generating a synthesized signal by mapping the obtained downlink channel information to an uplink wideband measurement signal for each base station, and simultaneously transmitting the synthesized signal to the two or more base stations.
- CSI downlink channel information
- a channel estimator for estimating a downlink channel from a signal received from each base station, a downlink channel information determiner for determining downlink channel information according to an estimated downlink channel state, and transmits to two or more base stations
- An uplink broadband measurement signal generator for generating a synthesized signal by mapping the downlink channel information to the uplink broadband measurement signal, and a signal transmitter for simultaneously transmitting the synthesized signal to the two or more base stations
- a channel estimator for estimating a downlink channel from a signal received from each base station, a downlink channel information determiner for determining downlink channel information according to an estimated downlink channel state, and transmits to two or more base stations
- An uplink broadband measurement signal generator for a signal synthesizer for generating a synthesized signal by mapping the downlink channel information to the uplink broadband measurement signal
- a signal transmitter for simultaneously transmitting the synthesized signal to the two or more base stations
- a method for obtaining downlink channel information in a base station comprising: receiving a synthesized signal obtained by mapping downlink channel information to an uplink wideband measurement signal from a terminal, and receiving the downlink from the synthesized signal; It provides a method comprising the step of recovering the channel information obtained.
- the present invention provides a base station apparatus for obtaining downlink channel information from a signal in which an uplink wideband measurement signal and a downlink channel information are synthesized, and synthesized by mapping downlink channel information to an uplink wideband measurement signal.
- the present invention provides a base station apparatus for determining a downlink channel state by receiving a from a terminal and obtaining information on the downlink channel state from the synthesized signal.
- FIG. 1 is a block diagram illustrating a wireless communication system to which embodiments of the present invention are applied.
- FIG. 2 is a functional block diagram of an apparatus for transmitting downlink channel information using an uplink wideband measurement signal according to an embodiment of the present invention.
- FIG. 3 is a flowchart illustrating a method for transmitting downlink channel information using an uplink wideband measurement signal according to an embodiment of the present invention.
- FIG. 4 is a diagram illustrating a composite signal for each base station or an SRS resource allocation method according to an embodiment of the present invention.
- FIG. 5 is a diagram illustrating a composite signal for each base station or SRS resource allocation method according to another embodiment of the present invention.
- FIG. 1 is a block diagram illustrating a wireless communication system to which embodiments of the present invention are applied.
- Wireless communication systems are widely deployed to provide various communication services such as voice and packet data.
- a wireless communication system operating in a coordinated multi-point transmission / reception system includes one or more terminals 10 (User Equipment, UE).
- the base station 20 receives information from the base station, and for smooth information transmission, the terminal must transmit information on a downlink channel to one or more base stations.
- Terminal 10 in the present specification is a generic concept that means a user terminal in wireless communication, WCDMA, UE (User Equipment) in LTE, HSPA, etc., as well as MS (Mobile Station), UT (User Terminal) in GSM ), SS (Subscriber Station), wireless device (wireless device), etc. should be interpreted as including the concept.
- WCDMA Wideband Code Division Multiple Access
- UE User Equipment
- HSPA High Speed Packet Access
- MS Mobile Station
- UT User Terminal
- SS Subscriber Station
- wireless device wireless device
- a base station 20 or a cell generally refers to a fixed station communicating with the terminal 10 and includes a Node-B, an evolved Node-B, and a Base Transceiver. May be called other terms such as System, Access Point, Relay Node
- the base station 20 or the cell should be interpreted in a comprehensive sense indicating some areas covered by the base station controller (BSC) in the CDMA, the NodeB of the WCDMA, and the like. It is meant to cover various coverage areas such as microcell, picocell, femtocell and relay node communication range.
- BSC base station controller
- the terminal 10 and the base station 20 are two transmitting and receiving entities used to implement the technology or technical idea described in the present specification and are used in a comprehensive sense and are not limited by the terms or words specifically referred to. .
- CDMA Code Division Multiple Access
- TDMA Time Division Multiple Access
- FDMA Frequency Division Multiple Access
- OFDMA Orthogonal Frequency Division Multiple Access
- OFDM-FDMA OFDM-FDMA
- OFDM-TDMA OFDM-TDMA
- OFDM-CDMA OFDM-CDMA
- the uplink transmission and the downlink transmission may use a time division duplex (TDD) scheme that is transmitted using different times, or may use a frequency division duplex (FDD) scheme that is transmitted using different frequencies.
- TDD time division duplex
- FDD frequency division duplex
- One embodiment of the present invention provides asynchronous wireless communication that evolves into Long Term Evolution (LTE) and LTE-advanced through GSM, WCDMA, HSPA, and synchronous wireless communication that evolves into CDMA, CDMA-2000 and UMB). Applicable to resource allocation.
- LTE Long Term Evolution
- LTE-advanced through GSM, WCDMA, HSPA, and synchronous wireless communication that evolves into CDMA, CDMA-2000 and UMB.
- the present invention should not be construed as being limited or limited to a specific wireless communication field, but should be construed as including all technical fields to which the spirit of the present invention can be applied.
- the CoMP system Compared to the conventional wireless communication system in which one terminal transmits downlink channel information to one base station, the CoMP system has a large feedback overhead for transmitting downlink channel information, and simultaneously provides channel information to different base stations. Signaling overhead is also greatly increased because it must be delivered.
- a method of estimating downlink channel information from an uplink reference signal has been proposed.
- this method has a disadvantage in that accurate information about the downlink channel cannot be transmitted to the base station.
- the uplink reference signal is downlinked. A method of adding or synthesizing link channel information is presented.
- an uplink reference signal or an uplink broadband measurement signal capable of adding or synthesizing downlink channel information a sounding reference signal used in Long Term Evolution (LTE) and LTE-Advanced ( Sounding Reference Signal (SRS), which has the same function as a pilot channel for an uplink channel.
- LTE Long Term Evolution
- SRS Sounding Reference Signal
- a sounding reference signal (hereinafter, referred to as a sounding reference signal or an SRS), which is an example of an uplink broadband measurement signal, will be described with reference to the present invention.
- SRS sounding reference signal
- the present invention is not limited to the SRS, and the SRS is a broad meaning uplink. It should be interpreted as a broadband measurement signal.
- Such SRS should be able to deliver uplink channel information for all bands including not only the band used by each user but also the band that the user may use, to the base station.
- the following describes a method of using SRS, which is an example of an uplink reference signal, and a method of estimating or obtaining downlink channel information through the SRS.
- the base station receives the known SRS from the specific terminal and then compares the received signal R with the known SRS signal, thereby identifying the degree of fading or attenuation and noise in the uplink channel.
- the base station can estimate the downlink channel using the received SRS. Do. That is, for example, the base station may estimate the downlink channel by obtaining the uplink channel matrix using the SRS transmitted from the terminal and then taking the transposed matrix thereof.
- the downlink channel information obtained in this way has a disadvantage that the accuracy is not high. That is, since the base station requires accurate information on the downlink channel to support the high speed information transmission, this method of estimating downlink channel information through SRS measurement is not suitable for high speed information transmission.
- the downlink channel information when the downlink channel changes rapidly, the downlink channel information must be continuously transmitted to the base station. However, there is a disadvantage in that the downlink channel change cannot be tracked quickly by the conventional method.
- a plurality of base stations may allocate a same or different frequency resource to a user at the same time when attempting a cooperative transmission / reception service to a user.
- the base station and the terminal receive and transmit the same frequency resource at the same time when transmitting and receiving the cooperative data. That is, a plurality of base stations selected as cooperative base stations at the same time transmit and receive data to one user using the same or different frequency resources. Therefore, the base station selected as the cooperative base station should be a base station having a good channel performance for any used frequency band for the user.
- the user analyzes the reference signals transmitted by each base station to determine the downlink channel status of each base station and each base station antenna, and feeds back the information directly or indirectly to the base station.
- a terminal may simultaneously transmit information to only one base station. That is, since there are a plurality of base stations that require downlink channel information, but one base station can transmit an information signal or a control signal, when transmitting downlink channel information together with a control signal or information signal, In order to solve this problem, a method of transmitting downlink channel information using a signal other than a control signal or an information signal is required.
- the terminal when the terminal transmits downlink channel information to two or more base stations, the terminal acquires downlink channel information (CSI) of each base station, and the obtained downlink channel information is uplinked to each base station. After generating a synthesized signal by mapping to a broadband measurement signal, the synthesized signal is simultaneously transmitted to two or more base stations.
- CSI downlink channel information
- FIG. 2 is a functional block diagram of an apparatus for transmitting downlink channel information using an uplink wideband measurement signal according to an embodiment of the present invention.
- the downlink channel information transmission apparatus is preferably implemented in the terminal, but is not limited thereto.
- a channel estimator 210 estimating a downlink channel from a signal received from each base station and an estimated downlink channel
- a downlink channel information determiner 220 for determining downlink channel information corresponding to a state
- an SRS generator 230 for generating an SRS that is an uplink wideband measurement signal to be transmitted to two or more base stations
- the signal combiner 240 may generate a synthesized signal by mapping downlink channel information, and may include a signal transmitter 250 simultaneously transmitting the synthesized signal to the two or more base stations.
- the channel estimator 210 may estimate a downlink channel from pilot signals received from each base station, but the present invention is not limited thereto, and any other method of identifying a downlink channel state between each base station and the terminal may be used. could be.
- the channel information determiner 220 determines downlink channel information corresponding to the estimated downlink channel state, and, as an example, the current downlink channel among codebooks consisting of a plurality of codewords (CW i ).
- a method of determining a codeword that best represents a state as downlink channel information may be used, but is not limited thereto.
- the SRS generator 230 generates an SRS that the base station already knows and determines a time-frequency band for transmitting the SRS.
- the SRS to be transmitted may be a digital bit signal, for example 1111.
- the signal synthesizing unit 240 synthesizes the generated SRS and downlink channel information, for example, codewords, and the synthesis may be added like a modular 2 operation, but the present invention is not limited thereto. Any calculation method, such as multiplication (multiplication), subtraction (subtraction), can be used as long as it exists.
- the exemplary embodiment may further include a differential modulator 260 for differentially modulating the channel information determined after the channel information determiner 220 to reduce the amount of transmitted information.
- the differentially modulated downlink channel information value may be input to the signal synthesis unit 240 and synthesized with the SRS value input from the SRS generation unit 230.
- the synthesized synthesized signal may be simultaneously transmitted to two or more base stations through the signal transmitter 250.
- the above-described downlink channel information and uplink wideband measurement signal (SRS) is preferably a digital bit signal, but is not limited thereto.
- the base station or cell receiving the synthesized signal synthesized with the SRS signal and the downlink channel information can obtain the desired downlink channel information by restoring the downlink channel information from the synthesized signal and the SRS signal already known, Specific examples thereof will be described below.
- the downlink channel information used in the present specification may be channel state information (CSI), but is not limited thereto.
- the channel state information is information on the present value of H, where H is a mathematical value representing a signal channel. This is part of constituting the signal model in wireless communication.
- R is the received signal
- X is the transmitted signal
- N is the noise. Since H is channel state information, these values are not constant, so the system generally needs to acquire information about H to recognize what signal is transmitted from the transmitting side.
- the terminal synthesizes such codewords as downlink channel information into an SRS and simultaneously transmits the codewords to two or more base stations, and the base station restores the SRS and the codewords from the synthesized signal and then uses the SRS.
- the downlink channel state is identified from the codeword.
- FIG. 3 is a flowchart illustrating a method for transmitting downlink channel information using an uplink wideband measurement signal according to an embodiment of the present invention.
- the terminal After the terminal estimates the downlink channel using pilot signals from each of two or more base stations, the terminal determines downlink channel information (CSI) of each base station. (S310)
- the downlink channel information may be one codeword selected from the codebook.
- the determined downlink channel information is mapped to the SRS signal and the synthesized or SRS signal for each base station to generate a synthesized signal (S320), and then transmitted to the corresponding base station (S330).
- the channel information value determined after determining the codeword may be differentially modulated.
- the synthesized signal Xsyn is determined as 01101 as shown in Equation 2 below.
- a codeword suitable for the downlink channel state of the base station is synthesized in the SRS and simultaneously transmitted to the base station.
- the length of the reference signal such as SRS
- the length of both signals can be kept the same through codeword repetition. It is also possible to adjust the length by puncturing.
- a method of synthesizing or mixing the codewords only on a part of the reference signal is possible.
- the synthesized signal transmitted as described above is received by the base station A as the received signal R, and the base station A restores the downlink channel information received signal r from the received signal R using a method synthesized by the known SRS and the transmitting terminal.
- the SRS restores the downlink channel information received signal r (-0.1, 0.8, 0.9, 0.1, 0.7) by using a method synthesized by the terminal, that is, modular 2 operation.
- Equation 4 To find a codeword that is downlink channel information transmitted by the terminal from the restored downlink channel information received signal r, Equation 4 below is used.
- CW i DM is a differential modulation value of each codeword CW i
- a differential modulation value of a code word having a minimum difference from the downlink channel information reception signal r is determined as CW DM .
- the base station A acquires the downlink channel information by recognizing the codeword which is the downlink channel information transmitted by the terminal.
- uplink channel estimation which is a basic function of SRS, is possible, and downlink channel information can be obtained.
- the interference is allocated by assigning the generated synthesized signal to the time-frequency domain so as not to overlap each base station. It should be possible to prevent this, which will be described below.
- a terminal allocates a synthesized signal or an SRS resource to be transmitted to several base stations, while the other base station (or cell) has a synthesized signal or a different symbol or at a different time.
- Send SRS Send SRS
- the composite signal or the SRS is transmitted to the base station A (or cell A) over the entire band for a detailed time interval (time slot) t1 time, and the other base station B (or cell B) to the full band for t2.
- the synthesized signal or SRS transmission resource corresponding to each cell is divided into a time domain.
- the UE allocates synthesized signals or SRS resources to various base stations, but transmits the synthesized signals or SRSs to other base stations (or cells) at different symbols or at different times.
- the base station uses a full-band resource by dividing only the time domain, but is not necessarily limited thereto. Semi random randomly allocates the time-frequency domain according to a predetermined rule for each base station as in the other embodiments below. You can also use the semi-random method.
- a UE transmits to multiple base stations in a time-frequency domain over an entire band consisting of a plurality of subbands.
- a synthesized signal or an SRS resource is allocated to each base station or each cell according to a specific rule according to specific time bands and subbands.
- a semi-random allocation method for receiving a synthesized signal or an SRS in all bands during a finite time interval (T) without overlapping an SRS transmission resource is illustrated.
- the limited time interval T means an entire period in which each of the plurality of base stations receiving the composite signal or the SRS from the terminal can receive / transmit the SRS in all bands.
- the detail time band or timeslot may have a single synthesized signal or SRS symbol size, but is not limited thereto.
- each cell receives the synthesized signal or the SRS in all subbands (bands) without interfering with each other when considering the total limited time interval T.
- the time division method of the above embodiment it satisfies the condition that the synthesized signal or the SRS should be transmitted over the entire band in each base station unit, but does not receive the synthesized signal or the SRS every predetermined time interval or time slot (T). Therefore, as the number of base stations or points to transmit signals at the same time increases, the time slot spacing increases further, which results in a decrease in the period of downlink channel information acquisition.
- the synthesized signal or SRS in each time slot.
- the synthesized signal or the SRS transmission cycle or transmission method should be considered separately from the synthesized signal or the SRS resource allocation (design).
- certain factors Explain whether to consider.
- the rate of change of the downlink channel is a format that the terminal estimates and reports to the base station.
- the present invention omits such a step and adopts a configuration for estimating the channel change rate from the synthesized signal or the SRS received by the base station and determining the synthesized signal or the SRS transmission period. Can be.
- the transmission period of the SRS should be determined so that each base station can estimate the downlink channel using the SRS received from one or more terminals. Since the SRS is basically a signal used for estimating uplink channel information, the SRS is transmitted. Frequency is determined by the rate of change of the uplink channel.
- the uplink and the downlink generally have different channel characteristics, but the rate of change of the two channels is determined by the moving speed of the terminal, so that the rate of change of the two channels becomes the same with high probability. Therefore, the frequency of transmitting uplink channel information to the base station and the frequency of transmitting downlink channel information to the base station may be the same.
- the present invention since the present invention has proposed a method for transmitting the SRS at frequent intervals, the method of estimating the change rate of the channel and reporting (feedback) to the base station as in the conventional method is omitted.
- the link channel information is needed, the configuration of transmitting the SRS is adopted, and even in this case, the downlink channel information may be obtained with sufficient frequency.
- the base station estimates the channel change rate from the received SRS and determines the SRS transmission period, it is also possible to determine not only the change rate of the uplink channel but also the change rate of the downlink channel.
- the above description divides the synthesized signal or the SRS transmission region into time (symbol or subframe) and frequency (subband), and then allows SRS to be estimated from the SRS without overlapping for each base station and / or user equipment.
- time symbol or subframe
- subband frequency
- the downlink channel from the SRS without overlapping for each base station and / or user equipment
- the downlink channel from the SRS without overlapping for each base station and / or user equipment
- the sounding reference signal is generated so as not to overlap each base station, and the sounding reference signal is allocated to the time-frequency domain.
- the sounding reference signal is allocated and transmitted.
- it may be implemented by determining the band to be used by each cell in a sequence such as Zadoff so that all cells use the entire band and receive the SRS in another subframe.
- SRS band allocation between UEs within each cell is again performed by 2-1) all terminals having the same hopping method and different initial offsets, so that each UE has all bands within a predetermined period T. It is also possible to transmit the SRS through, or 2-2) using the same method as the method of allocating the SRS to each terminal in the existing system.
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Abstract
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Claims (9)
- 단말이 하향링크 채널정보를 전송하는 방법에 있어서,2이상의 기지국으로부터 획득한 하향링크 채널 정보를 상기 각 기지국에 대한 상향링크 광대역 측정신호에 매핑하여 합성신호를 생성하는 단계상기 합성신호를 상기 2이상의 기지국으로 전송하는 단계를 포함하는 것을 특징으로 하는 상향링크 광대역 측정 신호를 이용한 하향링크 채널 정보 전송 방법.
- 제1항에 있어서,상기 하향링크 채널정보는 프리코딩 코드북의 코드워드인 것을 특징으로 하는 상향링크 광대역 측정 신호를 이용한 하향링크 채널 정보 전송 방법.
- 제1항에 있어서,상기 합성신호를 생성하기 이전에 상기 하향링크 채널정보를 차등변조(Differential Modulation)하는 단계를 더 포함하는 것을 특징으로 하는 상향링크 광대역 측정 신호를 이용한 하향링크 채널 정보 전송 방법.
- 제1항에 있어서,상기 합성신호를 상기 2 이상의 기지국에 전송할 때, 간섭이 발행하지 않도록 생성된 합성신호를 각 기지국에 대해서 중첩되지 않도록 시간-주파수 영역에 할당하는 것을 특징으로 하는 상향링크 광대역 측정 신호를 이용한 하향링크 채널 정보 전송 방법.
- 각 기지국으로부터 수신한 신호로부터 하향링크 채널을 추정하는 채널 추정부추정된 하향링크 채널 상태에 맞는 하향링크 채널 정보를 결정하는 하향링크 채널정보 결정부2 이상의 기지국으로 전송할 상향링크 광대역 측정신호 생성부상기 상향링크 광대역 측정신호에 상기 하향링크 채널정보를 매핑하여 합성신호를 생성하는 신호 합성부상기 합성신호를 상기 2 이상의 기지국으로 동시에 전송하는 신호 송신부를 포함하는 것을 특징으로 하는 상향링크 광대역 측정 신호를 이용한 하향링크 채널 정보 전송 장치.
- 기지국에서의 하향링크 채널정보 획득방법으로서,상향링크 광대역 측정신호에 하향링크 채널정보를 매핑하여 합성된 합성신호를 단말기로부터 수신하는 단계상기 합성신호로부터 상기 하향링크의 채널 상태에 관한 정보를 획득하는 단계를 포함하는 것을 특징으로 하는 하향링크 채널정보 획득 방법.
- 제6항에 있어서,상기 기지국은 합성신호에 대한 수신신호를 이용하여 상향링크 채널정보를 획득하는 단계를 추가로 포함하는 것을 특징으로 하는 하향링크 채널정보 획득 방법.
- 상향링크 광대역 측정신호와 하향링크 채널정보가 합성된 신호로부터 하향링크 채널정보를 획득하는 기지국 장치로서,상기 기지국 장치는,상향링크 광대역 측정신호에 하향링크 채널정보를 매핑하여 합성된 합성신호를 단말기로부터 수신하고, 상기 합성신호로부터 상기 하향링크의 채널 상태에 관한 정보를 획득함으로써 하향링크 채널 상태를 파악하는 것을 특징으로 하는 기지국 장치.
- 제8항에 있어서,상기 상향링크 광대역 측정신호는 사운딩 기준신호이며, 상기 하향링크 채널정보는 프리코딩 코드북의 코드워드인 것을 특징으로 하는 기지국 장치.
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CN2010800428160A CN102577565A (zh) | 2009-08-26 | 2010-08-18 | 在无线通信系统中利用上行宽带测量信号发送下行信道信息的方法和装置以及利用其获取下行信道信息的方法和装置 |
US13/391,795 US20120147845A1 (en) | 2009-08-26 | 2010-08-18 | Method and apparatus for transmitting downlink channel information using an uplink broadband measurement signal in a wireless communication system, and method and apparatus for acquiring downlink channel information using same |
JP2012526629A JP2013503543A (ja) | 2009-08-26 | 2010-08-18 | 無線通信システムにおけるアップリンク広帯域測定信号を用いたダウンリンクチャンネル情報の送信方法と装置、及びそれを用いたダウンリンクチャンネル情報の取得方法と装置 |
EP10812191A EP2472979A2 (en) | 2009-08-26 | 2010-08-18 | Method and apparatus for transmitting downlink channel information using an uplink broadband measurement signal in a wireless communication system, and method and apparatus for acquiring downlink channel information using same |
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KR1020090079489A KR20110021603A (ko) | 2009-08-26 | 2009-08-26 | 무선통신시스템에서 상향링크 광대역 측정 신호를 이용한 하향링크 채널 정보 전송 방법과 장치, 및 그를 이용한 하향링크 채널정보 획득방법 |
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EP (1) | EP2472979A2 (ko) |
JP (1) | JP2013503543A (ko) |
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US9204434B2 (en) | 2012-03-19 | 2015-12-01 | Qualcomm Incorporated | Enhanced sounding reference signal (SRS) operation |
KR101669701B1 (ko) * | 2012-06-25 | 2016-10-26 | 주식회사 케이티 | 물리적 상향링크 데이터 채널 맵핑정보 제공방법 및 그 송수신포인트, 물리적 상향링크 데이터 채널의 전송방법, 그 단말 |
WO2014003313A1 (ko) * | 2012-06-25 | 2014-01-03 | 주식회사 케이티 | 물리적 상향링크 데이터 채널 맵핑정보 송수신 방법 및 그 단말 |
US9049731B2 (en) * | 2012-12-03 | 2015-06-02 | At&T Mobility Ii Llc | Facilitation of bandwidth-based femto cell management |
CN103916350B (zh) * | 2013-01-04 | 2017-09-05 | 中国移动通信集团公司 | 一种获取载波的信道信息的方法、系统和装置 |
WO2016121257A1 (ja) * | 2015-01-26 | 2016-08-04 | 京セラ株式会社 | 無線通信装置および信号処理の制御方法 |
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WO2007103085A2 (en) * | 2006-03-01 | 2007-09-13 | Interdigital Technology Corporation | Method and apparatus for calibration and channel state feedback to support transmit beamforming in a mimo system |
KR100992896B1 (ko) * | 2006-11-28 | 2010-11-09 | 삼성전자주식회사 | 통신 시스템에서 사운딩 자원 할당 정보 송수신 시스템 및 방법 |
KR100950706B1 (ko) * | 2007-01-29 | 2010-03-31 | 삼성전자주식회사 | 다중 안테나 시스템에서 프리코딩 장치 및 방법 |
US7720164B2 (en) * | 2007-02-26 | 2010-05-18 | Telefonaktiebolaget L M Ericsson (Publ) | Transmission scheme for uplink access in a FDMA system |
KR20080085653A (ko) * | 2007-03-19 | 2008-09-24 | 엘지전자 주식회사 | 상향링크 기준신호 전송방법 |
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US7756099B2 (en) * | 2007-07-13 | 2010-07-13 | Mitsubishi Electric Research Laboratories, Inc. | Method and system for selecting antennas adaptively in OFDMA networks |
US8099132B2 (en) * | 2007-08-15 | 2012-01-17 | Qualcomm Incorporated | Antenna switching and uplink sounding channel measurement |
KR101428812B1 (ko) * | 2007-12-28 | 2014-08-08 | 삼성전자주식회사 | 무선 통신 네트워크에서 하향 링크 데이터 송수신 방법 및 장치 |
US8542640B2 (en) * | 2008-08-28 | 2013-09-24 | Ntt Docomo, Inc. | Inter-cell approach to operating wireless beam-forming and user selection/scheduling in multi-cell environments based on limited signaling between patterns of subsets of cells |
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- 2010-08-18 WO PCT/KR2010/005463 patent/WO2011025177A2/ko active Application Filing
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WO2011025177A3 (ko) | 2011-06-30 |
US20120147845A1 (en) | 2012-06-14 |
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