WO2016159621A1 - 대규모 안테나 시스템에서 자원 할당 장치 및 방법 - Google Patents

대규모 안테나 시스템에서 자원 할당 장치 및 방법 Download PDF

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Publication number
WO2016159621A1
WO2016159621A1 PCT/KR2016/003166 KR2016003166W WO2016159621A1 WO 2016159621 A1 WO2016159621 A1 WO 2016159621A1 KR 2016003166 W KR2016003166 W KR 2016003166W WO 2016159621 A1 WO2016159621 A1 WO 2016159621A1
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WIPO (PCT)
Prior art keywords
csi
reference signal
information
base station
terminal
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/KR2016/003166
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English (en)
French (fr)
Korean (ko)
Inventor
최승훈
노훈동
김동한
신철규
김윤선
곽영우
지형주
노상민
김영범
여정호
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to KR1020227016796A priority Critical patent/KR102524587B1/ko
Priority to US15/562,360 priority patent/US10721037B2/en
Priority to JP2018501842A priority patent/JP7085983B2/ja
Priority to EP16773402.9A priority patent/EP3276849B1/en
Priority to CN202110049989.5A priority patent/CN112910618B/zh
Priority to ES16773402T priority patent/ES2934716T3/es
Priority to CN201680025772.8A priority patent/CN107567695B/zh
Priority to EP22208571.4A priority patent/EP4161168A1/en
Priority to CA2981136A priority patent/CA2981136C/en
Priority to KR1020177030988A priority patent/KR102401000B1/ko
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Priority to AU2016241468A priority patent/AU2016241468B2/en
Publication of WO2016159621A1 publication Critical patent/WO2016159621A1/ko
Anticipated expiration legal-status Critical
Priority to US16/837,464 priority patent/US11552758B2/en
Priority to JP2022007955A priority patent/JP7342160B2/ja
Ceased legal-status Critical Current

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    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
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    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
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    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0636—Feedback format
    • H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
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    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
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    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0697—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using spatial multiplexing
    • 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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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    • H—ELECTRICITY
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    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
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    • H04L5/0014—Three-dimensional division
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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
    • 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
    • H—ELECTRICITY
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    • H—ELECTRICITY
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    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

  • Various embodiments of the present disclosure relate to an apparatus and a method for performing resource allocation based on downlink channel state information in a large-scale antenna system.
  • a 5G communication system or a pre-5G communication system is referred to as a Beyond 4G network communication system or a post LTE system.
  • 5G communication systems are being considered for implementation in the ultra-high frequency (mmWave) band (e.g., 60 gigabyte (60 GHz) band).
  • mmWave ultra-high frequency
  • MIMI massive multi-input multi-output
  • I / O full-dimensional multi-input
  • FD-MIMO Full dimensional MIMO
  • array antenna analog beam-forming, and large scale antenna techniques are discussed.
  • an advanced small cell in the 5G communication system, an advanced small cell, an advanced small cell, a cloud radio access network (cloud RAN), an ultra-dense network ), Device to device communication (D2D), wireless backhaul, moving network, cooperative communication, coordinated multi-points (CoMP), and interference cancellation Technology development, etc.
  • cloud RAN cloud radio access network
  • D2D Device to device communication
  • CoMP coordinated multi-points
  • interference cancellation Technology development etc.
  • ACM advanced coding modulation
  • SWM hybrid FSK and QAM modulation
  • SWSC sliding window superposition coding
  • FBMC filter bank multi carrier
  • SAP NOMA Non-orthogonal multiple access
  • SCMA sparse code multiple access
  • Wireless communication systems (hereinafter referred to as "large antenna systems") employing massive MIMO, FD-MIMO, and large scale antenna technologies discussed in 5G communication systems are more numerous than multiple antennas in existing wireless communication systems. It is assumed to use a plurality of array antennas composed of antennas.
  • the rank could support up to eight.
  • a base station announces configuration information corresponding to a plurality of reference signals for estimating a downlink channel state to a terminal, and from the terminal based on the known configuration information.
  • An apparatus and method for receiving feedback information can be provided.
  • an apparatus and method for generating channel state information for performing data transmission and reception in a large-scale antenna system and sharing the generated channel state information between a base station and a terminal may be provided.
  • an apparatus and method for configuring a channel status information reference signal (CSI-RS) for supporting a large antenna by a base station in a large antenna system may be provided.
  • CSI-RS channel status information reference signal
  • an apparatus and method for measuring a wireless channel state by a terminal in a large-scale antenna system and feeding back channel state information according to the measurement may be provided.
  • a terminal configures channel state information considering single-user MIMO and multi-user MIMO and MU-MIMO.
  • An apparatus and method for feeding back to a base station can be provided.
  • an apparatus for transmitting and receiving data to and from a terminal in a multiple transmission mode determined by a base station as one of a SU-MIMO mode and a MU-MIMO mode based on channel state information fed back from a terminal in a large-scale antenna system, an apparatus for transmitting and receiving data to and from a terminal in a multiple transmission mode determined by a base station as one of a SU-MIMO mode and a MU-MIMO mode based on channel state information fed back from a terminal. And methods.
  • a method for reporting a channel state by a wireless terminal may include receiving radio resource configuration information from a base station and receiving the received radio resource configuration information. Acquiring channel state information corresponding to each of the single-user mode and the multi-user mode according to the multiple access method based on at least one channel state indication reference signal received using Determining one of the single-user mode and the multi-user mode as a transmission mode based on the channel state information obtained correspondingly and the channel state information obtained in correspondence with the multi-user mode, and transmitting the transmission mode.
  • Feedback mode identification information to the base station It may include a process.
  • a wireless terminal for reporting a channel state may include: a communication unit configured to receive radio resource configuration information from a base station and to transmit channel state information to the base station; Acquires channel state information corresponding to each of the single user mode and the multi-user mode according to the multiple access method based on at least one or more channel state indication reference signals received using the received radio resource configuration information, Determine one of the single user mode and the multi-user mode as a transmission mode based on the channel state information obtained in correspondence with the single user mode and the channel state information obtained in correspondence with the multi-user mode, and determine the transmission mode
  • the transmission mode identification information indicating It may comprise a control unit for feeding back to the BS through the group communication.
  • a base station for transmitting resource allocation information for downlink includes one reference signal group including a plurality of reference signal configuration groups configured for feedback of channel state information.
  • a method of transmitting a reference signal for measuring a channel state of a downlink by a base station using a large antenna includes a plurality of reference signal configuration information and reference signal ports for transmission of the reference signal. Transmitting reference signal resource configuration information including information to a terminal, and some of the plurality of reference signal configuration information included in the reference signal resource configuration information and channel measurement resources indicated by the reference signal port information Or transmitting the reference signal to the terminal using all, wherein the channel measurement resources are as many antenna ports as indicated by the combination of the plurality of reference signal configuration information and the reference signal port information. It is characterized by correspondence.
  • a base station transmitting a reference signal for measuring a downlink channel state may include a plurality of reference signal configuration information and a reference for transmitting the reference signal.
  • a control unit constituting reference signal resource configuration information including signal port information, and transmitting the reference signal resource configuration information to a terminal, wherein the plurality of reference signal configuration information and the reference signal included in the reference signal resource configuration information
  • a communication unit which transmits the reference signal to the terminal using some or all of the channel measurement resources indicated by port information, wherein the channel measurement resources include the plurality of reference signal configuration information and the reference signal port. Corresponding to as many antenna ports as indicated by the combination of information.
  • a method for reporting a channel state by a wireless terminal may include: a reference signal including a plurality of reference signal configuration information and reference signal port information from a base station; Receiving the resource configuration information, and using the reference signal resource configuration information by using some or all of the plurality of reference signal configuration information and channel measurement resources indicated by the reference signal port information. And receiving feedback information according to a downlink channel state of measuring the received reference signal to the base station, wherein the channel measurement resources include the plurality of reference signal configuration information and the reference. Correspond to as many antenna ports as indicated by the combination of signal port information. And a gong.
  • a wireless terminal for reporting a channel state may include configuring reference signal resources including a plurality of reference signal configuration information and reference signal port information from a base station.
  • a controller configured to control the communication unit to receive a reference signal using some or all of the resources, and configure the feedback information according to a downlink channel state in which the received reference signal is measured.
  • Resources include the plurality of reference signal configuration information and the reference signal port. A corresponds to the antenna port of as many as the number indicated by the combination of the beam is characterized.
  • FIG. 1 is a diagram illustrating an FD-MIMO system according to various embodiments of the present disclosure.
  • FIG. 2 is a diagram illustrating an antenna arrangement example in a wireless communication system according to various embodiments proposed in the present disclosure.
  • FIG. 3 is a diagram illustrating an example of a radio resource in an FD-MIMO system according to various embodiments of the present disclosure.
  • FIG. 4 is a diagram illustrating signals transmitted from two base stations to which an interference measurement resource (IMR) is applied for various embodiments proposed in the present disclosure.
  • IMR interference measurement resource
  • FIG. 5 is a diagram illustrating an example of a wireless communication system supporting a multiple access scheme according to various embodiments of the present disclosure.
  • FIG. 6 is a diagram illustrating a channel estimation procedure in a wireless communication system supporting a multiple access scheme according to various embodiments proposed in the present disclosure.
  • FIG. 7 is a diagram illustrating a structure of a base station according to various embodiments of the present disclosure.
  • FIG. 8 is a diagram illustrating a structure of a terminal according to various embodiments of the present disclosure.
  • FIG. 9 is a diagram illustrating a control flow performed by a base station according to various embodiments proposed in the present disclosure.
  • FIG. 10 is a diagram illustrating a control flow performed by a terminal according to various embodiments proposed in the present disclosure.
  • FIG. 11 is a diagram illustrating a control flow of determining, by the terminal, identification information indicating a multiple transmission mode in an FD-MIMO system according to various embodiments proposed in the present disclosure.
  • FIG. 12 is a diagram illustrating a scenario in which a UE feeds back a SU / MU indicator based on wCQI in an FD-MIMO system according to various embodiments proposed in the present disclosure.
  • FIG. 13 is a diagram illustrating a scenario in which a UE feeds back a SU / MU indicator based on sCQI in an FD-MIMO system according to various embodiments proposed in the present disclosure.
  • FIG. 14 is a diagram illustrating a scenario in which a UE separately feeds a SU / MU indicator to wCQI and sCQI in an FD-MIMO system according to various embodiments proposed in the present disclosure.
  • FIG. 15 is a diagram illustrating a configuration example of a CSI-RS for antenna configuration and measurement in a large multi-antenna system according to various embodiments proposed in the present disclosure.
  • FIG. 16 illustrates an example of configuring a plurality of CSI-processes for configuring a plurality of CSI-RSs in an FD-MIMO system according to an embodiment proposed in the present disclosure.
  • FIG. 17 is a diagram illustrating an example of configuring one CSI-process for configuring a plurality of CSI-RSs in an FD-MIMO system according to an embodiment proposed in the present disclosure.
  • FIG. 18 is a diagram illustrating an example of a configuration of a CSI-RS in an FD-MIMO system according to various embodiments of the present disclosure.
  • FIG. 19 is a diagram illustrating a configuration example for associating multiple CSI-RS configurations with one CSI process according to various embodiments of the present disclosure.
  • 20 is a diagram illustrating an example of generating CSI using a plurality of CSI-RS resource locations according to various embodiments proposed in the present disclosure.
  • FIG. 21 is a diagram illustrating an example in which a base station maps CSI-RS resources and CSI-RS port indexes according to various embodiments proposed in the present disclosure.
  • FIG. 22 is a diagram illustrating examples of locations of intersection reference signals according to various embodiments proposed in the present disclosure.
  • FIG. 23 is a diagram illustrating an example of allowing a terminal to recognize a CSI-RS puncturing pattern of a base station using a bitmap according to various embodiments proposed in the present disclosure.
  • FIG. 24 is a diagram illustrating an example of recognizing a CSI-RS puncturing pattern by a composite bitmap indication according to various embodiments proposed in the present disclosure.
  • FIG. 25 is a diagram illustrating an example of a known CSI-RS not used in an FD-MIMO system according to various embodiments proposed in the present disclosure.
  • FIG. 26 is a diagram illustrating an example in which each CSI-RS resource shares some CSI-RS port index in an FD-MIMO system according to various embodiments proposed in the present disclosure.
  • FIG. 27 is a diagram illustrating another example in which each CSI-RS resource shares some CSI-RS port index in an FD-MIMO system according to various embodiments proposed in the present disclosure.
  • FIG. 28 is a diagram illustrating an example of one CSI process in which a plurality of CSI-RSs are set according to various embodiments proposed in the present disclosure.
  • FIG. 29 is a diagram illustrating another example of one CSI process in which a plurality of CSI-RSs are set according to various embodiments proposed in the present disclosure.
  • FIG. 30 is a diagram illustrating another example of configuring CSI-RS ports according to various embodiments of the present disclosure.
  • FIG. 31 is a diagram illustrating an example of a channel measurement resource (CMR) pattern according to various embodiments of the present disclosure.
  • CMR channel measurement resource
  • FIG. 32 is a diagram illustrating an example in which a CMR pattern is indicated by a resource indicator according to various embodiments of the present disclosure.
  • 33 is a diagram illustrating an example of a pattern for allocating CSI-RS resources according to various embodiments of the present disclosure.
  • FIG. 34 is a diagram illustrating another example of a pattern for allocating CSI-RS resources according to various embodiments of the present disclosure.
  • FIG. 1 is a diagram illustrating an FD-MIMO system according to various embodiments of the present disclosure.
  • the base station transmits a radio signal using the antenna set 100.
  • a plurality of transmission antennas (eg, eight or more) constituting the antenna set 100 are arranged to maintain a minimum distance from each other (reference numeral 110).
  • the base station may transmit radio signals to a plurality of terminals by a high order multi-user (MIMO) using a plurality of transmit antennas constituting the antenna set 100.
  • MIMO multi-user
  • the higher order MU-MIMO transmits data by allocating spatially separated transmission beams to a plurality of terminals using a plurality of base station transmit antennas.
  • the high order MU-MIMO may be made using the same time and frequency resources.
  • the UE In the FD-MIMO system, the UE accurately measures the channel conditions and the magnitude of the interference, and must be able to transmit effective channel state information to the base station by using the UE.
  • the base station may determine a transmission mode (SU-MIMO, MU-MIMO), transmission rate, precoding, etc. to be applied to the terminal based on the channel state information.
  • SU-MIMO transmission mode
  • MU-MIMO transmission rate
  • precoding precoding
  • the base station In order to support the MU-MIMO, the base station needs to receive feedback of channel state information on the MU-MIMO from the terminal.
  • a base station in the FD-MIMO system will provide a method for selectively applying one of SU-MIMO and MU-MIMO as a transmission mode for a specific terminal.
  • FIG. 2 is a diagram illustrating an antenna arrangement example in a wireless communication system according to various embodiments proposed in the present disclosure.
  • an antenna set in a massive MIMO system or an FD-MIMO system may include a plurality of antennas (8 or more) arranged in two dimensions.
  • the antenna set may include, for example, tens or more transmit antennas.
  • the plurality of transmit antennas are arranged to maintain a certain distance.
  • the predetermined distance may correspond to, for example, a multiple of half the wavelength length of the transmitted radio signal.
  • the transmission equipment of the base station may transmit signals to the terminal using, for example, N H antennas arranged on the horizontal axis and N V antennas arranged on the vertical axis.
  • the base station transmission equipment may apply precoding for each of a plurality of transmission antennas and transmit a signal to the plurality of terminals based on this.
  • FIG. 3 is a diagram illustrating an example of a radio resource in an FD-MIMO system according to various embodiments of the present disclosure.
  • radio resources may be defined by a time axis and a frequency axis.
  • the time axis may consist of one subframe.
  • the frequency axis may consist of one resource block (RB).
  • the one subframe may include 14 OFDM symbols, and the one resource block may include 12 subcarriers.
  • the radio resource may consist of 168 resource elements (REs) having natural frequencies and time positions.
  • CRS cell specific RS
  • DMRS demodulation reference signal
  • PDSCH physical downlink shared channel
  • CSI-RS channel status information reference signal
  • PHICH, PCFICH, PDCCH control channels
  • the CRS is a reference signal periodically transmitted for all UEs belonging to one cell.
  • the CRS may be commonly used by a plurality of terminals.
  • the DMRS is a reference signal transmitted for a specific terminal.
  • the DMRS may be transmitted only when data is transmitted to the terminal.
  • the PDSCH is a downlink data channel and may be transmitted using an RE in which a reference signal is not transmitted in the data area.
  • the CSI-RS is a reference signal transmitted for terminals belonging to one cell and may be used to measure a channel state. A plurality of CSI-RSs may be transmitted in one cell.
  • the other control channels (PHICH, PCFICH, PDCCH) can be used to provide control information necessary for the UE to receive the PDSCH or to transmit ACK / NACK for operating HARQ for uplink data transmission.
  • the base station may transmit or apply muting to the CSI-RS in some or all of the REs of the locations indicated by A, B, C, D, E, F, G, H, I, and J.
  • the CSI-RS may be transmitted to 2, 4, and 8 REs according to the number of antenna ports to transmit.
  • the CSI-RS is transmitted in half of the specific pattern. If the number of antenna ports is 4, the CSI-RS is transmitted in the entire pattern, and if the number of antenna ports is 8, the two patterns are used. CSI-RS is transmitted.
  • the UE may be allocated CSI-IM (or IMR, interference measurement resources) in addition to the CSI-RS from the base station.
  • the resource of the CSI-IM may have the same resource structure and location as the CSI-RS supporting 4 ports.
  • the CSI-IM is a resource for accurately measuring interference from an adjacent base station by a terminal receiving data from one or more base stations. For example, a base station configures a CSI-RS and two CSI-IM resources, and a neighboring base station always transmits a signal in one CSI-IM, and a neighboring base station does not always transmit a signal in another CSI-IM. The amount of interference of neighboring base stations can be measured.
  • the base station may transmit a reference signal, that is, a CRS or a channel status information reference signal (CSI-RS), to the terminal to measure the downlink channel status.
  • the terminal may measure the channel state between the base station and itself using the CRS or CSI-RS transmitted by the base station.
  • the channel state basically has to consider several factors. This may include the amount of interference in the downlink.
  • the amount of interference in the downlink may include interference signals and thermal noise generated by an antenna belonging to an adjacent base station.
  • the amount of interference in the downlink may be important for the terminal to determine the channel status of the downlink.
  • the terminal may feed back information about the channel state of the downlink to the base station.
  • the terminal measures, for example, a reference signal transmitted by the base station, and feeds back the information extracted by the measurement to the base station.
  • the information fed back by the terminal may include a rank indicator (RI), a precoder matrix indicator (PMI), a channel quality indicator (CQI), and the like.
  • the RI is the number of spatial layers that the UE can receive in the current channel state
  • the PMI is an indicator of a precoding matrix preferred by the UE in the current channel state
  • the CQI is the current channel of the UE.
  • the CQI may be replaced with signal energy versus interference and noise strength (SINR), maximum error correction code rate and modulation scheme, and data efficiency per frequency, which may be utilized similarly to the maximum data rate.
  • SINR signal energy versus interference and noise strength
  • the RI, PMI, and CQI are related to each other.
  • the precoding matrix may be defined differently for each rank. Therefore, the PMI value when RI has a value of 1 and the PMI value when RI has a value of 2 are interpreted differently even if the value is the same.
  • the UE determines the CQI it is assumed that the rank value and the PMI value informed by the UE of the base station are applied by the base station. That is, when the terminal informs the base station of RI_X, PMI_Y, and CQI_Z, it means that the terminal can receive a data rate corresponding to CQI_Z when the rank is RI_X and the precoding is PMI_Y.
  • the UE assumes a transmission method to be performed to the base station when calculating the CQI, so that the optimized performance can be obtained when the actual transmission is performed using the transmission method.
  • a base station having a large antenna needs to configure a reference signal resource for measuring channels of eight or more antennas and transmit the same to a terminal.
  • up to 48 REs can be used for the available CSI-RS resources, but up to 8 CSI-RSs can be configured per one cell. Therefore, a new CSI-RS configuration method is needed to support an FD-MIMO system that can operate based on eight or more CSI-RS ports.
  • FIG. 4 is a diagram illustrating signals transmitted by two base stations to which IMR is applied for various embodiments proposed in the present disclosure.
  • eNB A configures IMR C for a UE located in cell A.
  • FIG. eNB B configures IMR J for a UE located in cell B. That is, UEs located in cell A receive a PDSCH transmitted from eNB A. For this purpose, UEs should be informed of channel state information.
  • the terminal should be able to measure the channel Es / (Io + No) (signal energy versus interference and noise strength) in order to generate channel state information.
  • IMR enables the UE to measure interference and noise strength.
  • the eNB A and the eNB B may cause interference with each other. That is, the signal transmitted from the eNB B may act as interference to the terminal receiving the signal from the eNB A. In addition, the signal transmitted from the eNB A may act as interference to the terminal receiving the signal from the eNB B.
  • the eNB A sets the IMR C to the UE so that the UE located in the cell A measures interference generated by the eNB B.
  • the eNB A does not transmit a signal at the location of IMR C.
  • the signal received by the UE in IMR C is a signal transmitted from eNB B such as 400 and 410. That is, the terminal receives only the signal transmitted from the eNB B in the IMR C, and can measure the reception strength of the signal to determine the interference strength caused by the eNB B.
  • eNB B may set the IMR J to the UE so that the UE located in cell B measures interference generated by eNB A. In this case, the eNB B does not transmit a signal at the position of IMR J.
  • IMR When using the IMR, it is possible to effectively measure the strength of interference occurring at another eNB or transmission point. That is, in the multi-cell mobile communication system or distributed antenna system in which a plurality of cells coexist, IMR can be used to effectively measure the strength of interference generated in neighboring cells or the interference occurring in adjacent transmission points. In addition, the intensity of the MU-MIMO interference can be measured using the IMR.
  • the terminal reports the channel state information corresponding to the downlink to the base station, so that efficient resource allocation by the base station can be performed. Will arrange.
  • a method for selectively applying SU-MIMO and MU-MIMO to a specific terminal in a massive MIMO system or an FD-MIMO system will be prepared.
  • an appropriate allocation between the resources for the reference signal and the resources for the traffic channel transmission may be performed to obtain the optimal performance in terms of overall system capacity. I will make a plan.
  • FIG. 5 is a diagram illustrating an example of a wireless communication system supporting a multiple access scheme according to various embodiments of the present disclosure.
  • the base station 510 manages a plurality of cells and transmits / receives signals with terminals (terminal # 1 to terminal #N) 520-1 and 520 -N distributed in the plurality of cells. Can be performed.
  • the base station 510 may transmit or receive a signal based on a multiple access scheme using a multi-carrier such as orthogonal frequency division multiple access (OFDMA).
  • OFDMA orthogonal frequency division multiple access
  • the base station 510 and the terminal # 1 to the terminal #N may be provided with a plurality of transmit or receive antennas to support a multiple access scheme. It is assumed that the base station 510 includes N Tx transmit antennas, and each of the terminal # 1 to the terminal #Ns 520-1 and 520 -N has N Rx1 or N Rx2 receive antennas. .
  • the base station 510 may transmit configuration information and a reference signal for channel estimation to the terminal # 1 to the terminal #N 520-1, 520 -N.
  • the configuration information may include all or part of configuration information for the CSI-RS and RRC information.
  • the base station 510 may receive feedback information from the terminal at a timing determined by the configuration information.
  • the base station 510 may determine a transmission method based at least on the received feedback information. In this case, the base station may transmit or receive a signal with the terminal based on the determined transmission method.
  • the terminal # 1 to the terminal #N may receive the configuration information from the base station 510.
  • the terminal # 1 to the terminal #N may perform channel estimation based on the reference signal (CSI-RS, etc.) received from the base station 510.
  • the terminal # 1 to the terminal #N configures the feedback information based on the information according to the channel estimation, and the feedback information configured to the base station 510 at a timing determined by the configuration information Can be transmitted.
  • the terminal # 1 to the terminal #N (520-1, 520-N) transmits or receives a signal with the base station 510 by a transmission method determined by the base station 510 based at least on feedback information. can do.
  • FIG. 6 is a diagram illustrating a channel estimation procedure in a wireless communication system supporting a multiple access scheme according to various embodiments proposed in the present disclosure.
  • the base station 510 transmits configuration information and a reference signal for channel estimation to the terminal 520, and the terminal 520 transmits the configuration information transmitted by the base station 510.
  • a reference signal for channel estimation may be received.
  • the configuration information may include all or part of configuration information for the CSI-RS and RRC information.
  • the base station 510 may generate channel state information for effectively transmitting and receiving data, and include the generated channel state information in configuration information and provide the generated channel state information to the terminal 520.
  • the terminal 520 transmits feedback information prepared based on a result of channel estimation to the base station 510, and the base station 510 receives the feedback information transmitted by the terminal 520.
  • the feedback information may further include a SU / MU indicator (SMI) in addition to at least one CQI among RI, PMI, sCQI, and wCQI.
  • SMI is information indicating one of the SU-MIMO mode and the MU-MIMO mode as a preferred multi-transmission mode when considering a current channel state through channel estimation for downlink.
  • FIG. 7 is a diagram illustrating a structure of a base station according to various embodiments of the present disclosure.
  • the base station may include a control unit 710 and a communication unit 720.
  • the control unit 710 may control the state and operation of all components constituting the base station.
  • the communication unit 720 may perform communication with a counterpart device (eg, a terminal) under the control of the controller 710.
  • the controller 710 may allocate, for example, CSI-RS resources for channel estimation of the terminal to the terminal.
  • the channel estimation by the CSI-RS resource may include channel estimation for both horizontal and vertical components.
  • the controller 710 may allocate feedback resources and feedback timing to the terminal.
  • the controller 710 may receive feedback information reported by the specific terminal at the feedback timing allocated to the specific terminal, and interpret the received feedback information.
  • the controller 710 may include a resource allocating unit 712 therein.
  • the resource allocator 712 allocates the CSI-RS to each resource so that the terminal can estimate the vertical and horizontal component channels, and uses the corresponding resource to process the CSI-RS through the communication unit 720. Can send to the device.
  • the resource allocator 712 may allocate feedback setting and feedback timing for each terminal and receive feedback information set at a corresponding timing so that feedback information from various terminals does not collide with each other.
  • the resource allocator 712 may also analyze the received feedback information.
  • the resource allocating unit 712 is configured as a separate block in the control unit 710, but is not necessarily limited thereto.
  • the controller 710 may perform a function performed by the resource allocator 712 instead.
  • the resource allocator 712 may not need to be configured as a separate block.
  • the resource allocation unit 712 may be provided as a separate configuration for configuring the base station, not the inside of the control unit 710.
  • the controller 710 may determine whether SU-MIMO transmission or MU-MIMO transmission is appropriate for the terminal based on the feedback information reported for each terminal.
  • the controller 710 may support SU-MIMO transmission or MU-MIMO transmission for the corresponding terminal based on the determination result.
  • the controller 710 may control the communicator 720 to transmit setting information about each of at least two reference signals to the terminal.
  • the controller 710 may measure the at least two reference signals.
  • the controller 710 may control the communication unit 720 to transmit feedback setting information to the terminal.
  • the feedback setting information may be configured to generate feedback information according to a result of the terminal measuring the at least two reference signals.
  • the controller 710 may transmit the at least two reference signals to the terminal and control the communication unit 720 to receive feedback information transmitted from the terminal in feedback timing according to the feedback setting information. have.
  • the base station may receive a channel quality indicator (CQI) from the terminal.
  • the CQI may indicate whether SU-MIMO transmission is suitable or whether MU-MIMO transmission is suitable. In this case, it is possible to prevent the terminal from unnecessarily feeding back channel information on the MU-MIMO, and to allow the base station to operate one of the SU-MIMO and the MU-MIMO appropriately for the channel environment.
  • the controller 710 may perform an overall operation for performing high efficiency data transmission and reception based on the FD-MIMO transmission. For example, the controller 710 notifies the terminal of configuration information regarding a plurality of CSI-RSs, so that the terminal can generate feedback information according to the known configuration information.
  • the controller 710 may control the communication unit 720 to transmit setting information about each of at least one reference signal to the terminal.
  • the controller 710 may generate the at least one reference signal.
  • the controller 710 may control the communication unit 720 to transmit feedback setting information for generating a feedback information according to a measurement result by the terminal to the terminal.
  • the control unit 710 controls the communication unit 720 to transmit the at least one reference signal to the terminal, and feedback information transmitted from the terminal through the communication unit 720 in the feedback timing according to the feedback setting information. Can be received.
  • the controller 710 may transmit feedback setting information to a terminal, transmit a CSI-RS to the terminal, and send feedback information generated based on the feedback setting information and the CSI-RS from the terminal. Can be received.
  • the controller 710 may control the communication unit 720 to transmit additional feedback setting information based on the relationship between the antenna setting and the feedback setting information corresponding to each antenna port group of the base station. Can be.
  • the controller 710 may transmit a beam-formed CSI-RS to the terminal based on the feedback information, and receive feedback information generated based on the CSI-RS from the terminal.
  • the base station may set various numbers of CSI-RSs according to the number of TXRUs or other communication situations in which the base station operates.
  • the terminal by allowing the terminal to effectively generate channel state information in accordance with the configuration of the base station, it is possible to reduce the CQI mistach and further processing at the base station for the reported channel state information.
  • the communication unit 720 may transmit and receive data, reference signals, and feedback information to the terminal.
  • the communication unit 720 may transmit the CSI-RS to the terminal through the resources allocated under the control of the controller 710 and receive channel information fed back from the terminal.
  • FIG. 8 is a diagram illustrating a structure of a terminal according to various embodiments of the present disclosure.
  • the terminal may include a control unit 810 and a communication unit 820.
  • the controller 810 may control the state and operation of all components constituting the terminal.
  • the communication unit 820 may perform communication with a counterpart device (eg, a base station) under the control of the control unit 810.
  • the terminal may further include various components according to the function to be performed.
  • the terminal may further include, for example, a display unit displaying a current state, an input unit to which a signal such as performing a function from a user is input, a storage unit storing data, and the like.
  • the controller 810 generates feedback information according to, for example, information allocated from a base station.
  • the controller 810 may control the communication unit 820 to feed back the generated channel information according to timing information allocated from the base station.
  • the controller 810 may include a channel estimator 812 therein.
  • the channel estimator 812 may determine necessary feedback information through the CSI-RS and feedback allocation information received from the base station, and may estimate the channel using the received CSI-RS.
  • the channel estimator 812 is configured as a separate block in the controller 810, but is not necessarily limited thereto.
  • the controller 810 may perform a function performed by the channel estimator 812 instead, and in this case, the channel estimator 812 may not need to be configured as a separate block.
  • the channel estimator 812 may be provided as a separate configuration for configuring a base station, not inside the controller 810.
  • the controller 810 may control the communication unit 820 to receive configuration information about each of at least one reference signal resource or configuration information about each of at least two reference signals from the base station.
  • the controller 810 may control the communication unit 820 to receive feedback setting information from the base station.
  • the feedback setting information may be considered when the terminal measures at least two reference signals transmitted by the base station and generates feedback information according to the measurement result.
  • the controller 810 may measure at least one reference signal or at least two reference signals received through the communication unit 820, and generate feedback information based on the measured result and feedback setting information.
  • the controller 810 may control the communicator 820 to transmit the generated feedback information to the base station in feedback timing according to the feedback setting information.
  • the controller 810 may receive a channel status indication-reference signal (CSI-RS) from a base station and generate feedback information based on the received CSI-RS.
  • the controller 810 may transmit the generated feedback information to the base station.
  • the controller 810 selects a precoding matrix for each antenna port group of the base station, and adds one additional precoding matrix based on the relationship between the antenna port groups of the base station. You can choose.
  • CSI-RS channel status indication-reference signal
  • the controller 810 may receive a CSI-RS from a base station and generate feedback information based on the received CSI-RS.
  • the controller 810 may transmit the generated feedback information to the base station.
  • the controller 810 may select one precoding matrix for all antenna port groups of the base station.
  • the controller 810 receives feedback setting information from a base station, receives a CSI-RS from the base station, and generates feedback information based on the received feedback setting information and the received CSI-RS. can do.
  • the controller 810 may transmit the generated feedback information to the base station.
  • the controller 810 may receive additional feedback setting information based on the relationship between the feedback setting information corresponding to each antenna port group of the base station and the antenna port group.
  • the communication unit 820 may transmit or receive various types of signals including data with a counterpart device (eg, a base station) based on at least one communication method among various communication methods.
  • the communication unit 820 may be controlled by the control unit 810 to communicate with a counterpart device.
  • the communication unit 820 may transmit, to the counterpart device, that is, the base station, for example, channel quality indicator information for effectively performing a transmission operation of SU-MIMO and MU-MIMO under the control of the controller 810.
  • the communication unit 820 may transmit feedback information to the base station under the control of the control unit 810.
  • FIG. 9 is a diagram illustrating a control flow performed by a base station according to various embodiments proposed in the present disclosure.
  • the base station may transmit configuration information to the terminal in step 910.
  • the base station may receive feedback information from the terminal at a timing determined by the configuration information.
  • the base station may determine the transmission method based at least on the feedback information received in step 930. In this case, the base station may transmit or receive a signal with the terminal based on the determined transmission method.
  • the base station configures base station configuration information and transmits the configured base station configuration information to the terminal.
  • the base station configuration information may include all or part of configuration information for the CSI-RS, RRC information.
  • An example of the base station configuration information may be defined as shown in Table 1 below.
  • Table 1 Base station configuration information CSI-RS setting First channel information (MU-MIMO): CSI-RS-1 Second channel information (SU-MIMO): CSI-RS-2Reporting (feedback) modePMI codebook informationetc.
  • MU-MIMO First channel information
  • SU-MIMO Second channel information
  • CSI-RS-2Reporting (feedback) modePMI codebook information etc.
  • the base station configuration information may include CSI-RS configuration information.
  • the CSI-RS configuration information includes information on the number of ports for the CSI-RS, timing and resource location of each CSI-RS transmission, sequence information, and P c. It can be used to confirm all or part of information and the like. For example, the base station may lower the P c value to the terminal. In this case, the terminal may use the P c value provided by the base station to calculate the correct CQI for the PDSCH.
  • the base station configuration information may include information corresponding to a plurality of channel information.
  • the base station configuration information for example, if the corresponding feedback is for two CSI-RS (CSI-RS-1, CSI-RS-2), the two CSI-RS (CSI-RS-1, CSI- Information corresponding to first channel information for RS-2 (first channel information (SU-MIMO): CSI-RS-1) and information corresponding to second channel information (MU-MIMO): CSI-RS-2).
  • each of the first channel information and the second channel information represents a CSI-RS corresponding to SU-MIMO and MU-MIMO.
  • each of the first channel information and the second channel information represents a CSI-RS corresponding to MU-MIMO and SU-MIMO.
  • the base station configuration information may include reporting or feedback mode information.
  • the feedback mode information may be information indicating the type of feedback information generated by the terminal and reported to the base station. That is, the feedback mode information includes two PMI i 1 and i in which the UE defines the optimal rank, precoding matrix, etc. for SU-MIMO and MU-MIMO using CSI-RS-1 and CSI-RS-2. 2 and generate a CQI to notify the base station to report.
  • the feedback mode information may also include information indicating whether each of i 2 and CQI should be reported as subband information or wide band information.
  • the base station configuration information may include PMI codebook information.
  • the PMI codebook information means information on a set of precoding matrices usable in the current channel situation among the codebooks. If the PMI codebook information is not included in the RRC information for the feedback, the UE may recognize that all possible precoding matrices in the predefined codebook may be used for each feedback.
  • Other information (etc.) of the base station configuration information may include a feedback period and offset information or interference measurement resource information for periodic feedback.
  • the base station may receive feedback information from the terminal at the corresponding feedback timing defined by the base station configuration information transmitted to the terminal, and determine a channel state with the terminal.
  • the base station may determine the transmission method based on the received feedback information.
  • the base station may transmit configuration information on the CSI-RS for measuring the channel to the terminal.
  • the configuration information may include at least one of the number of ports for each CSI-RS, a timing and resource location at which each CSI-RS is transmitted, and transmission power information.
  • the base station may transmit feedback configuration information based on at least one CSI-RS to the terminal.
  • the base station will transmit the CSI-RS to the terminal.
  • the terminal estimates a channel for each antenna port, and can estimate an additional channel for a virtual resource based on this.
  • the terminal may determine the feedback, generate a corresponding PMI, RI, CQI and the like and report it to the base station.
  • the base station may receive feedback information from the terminal at a predetermined timing, and use the received feedback information to determine a channel state with the terminal.
  • FIG. 10 is a diagram illustrating a control flow performed by a terminal according to various embodiments proposed in the present disclosure.
  • the terminal may receive configuration information from the base station in step 1010.
  • the terminal may perform channel estimation based on a reference signal (CSI-RS, etc.) received from the base station.
  • the terminal configures feedback information based on the information according to channel estimation, and transmits the configured feedback information to the base station at a timing determined by the configuration information.
  • the terminal may transmit or receive a signal with the base station by a transmission method determined by the base station based at least on feedback information.
  • the terminal may receive base station configuration information from the base station and perform channel estimation based on the received base station configuration information.
  • the base station configuration information may be configured as shown in Table 1.
  • the terminal is based on the CSI-RS configuration information (CSI-RS setting) included in the base station configuration information, the number of ports for the CSI-RS, the timing and resource location of each CSI-RS transmission, sequence information and You can check all or part of the PC information.
  • the UE may use the P c information (P c value defined in 7.2.5 of 3GPP LTE standard TS.36.213) to calculate the correct CQI for the PDSCH.
  • the terminal may determine the type of feedback information to report to the base station based on the reporting or feedback mode information included in the base station configuration information. That is, the terminal uses the CSI-RS-1 and CSI-RS-2 based on the feedback mode information to define the optimal rank, precoding matrix (precoding matrix) for SU-MIMO and MU-MIMO PMI i 1 and i 2 and CQI may be generated and reported to the base station. The terminal may determine whether to report each of i 2 and CQI as subband information or wideband information based on feedback mode information.
  • the terminal may obtain information about a set of precoding matrices in which PMI codebook information included in base station configuration information can be used in a current channel condition. If the PMI codebook information is not included in the RRC information for feedback, the terminal may use all precoding matrices in the predefined codebook for feedback.
  • the terminal may obtain a feedback period, offset information, or interference measurement resource information for periodic feedback from other base station configuration information.
  • the terminal generates a CQI based on the result of channel estimation.
  • the terminal may generate, for example, a SU-MIMO based CQI (SU-CQI) and a MU-MIMO based CQI (MU-CQI).
  • SU-CQI SU-MIMO based CQI
  • MU-CQI MU-MIMO based CQI
  • the terminal compares the difference between SU-CQI and MU-CQI and sets a reference value ( If greater than or equal to), it may be determined that SU-MIMO transmission is preferred, and if it is smaller than the set reference value, it may be determined that MU-MIMO transmission is preferred. Otherwise, if the difference between SU-CQI and MU-CQI is equal to the set reference value, it may be determined that MU-MIMO transmission is preferred.
  • the difference between the SU-CQI and the MU-CQI may be compared using the sum of the CQIs calculated for each codeword.
  • the terminal may generate the SU / MU indicator information, feedback information rank, PMI, and CQI based on the previously identified channel information.
  • the terminal finishes the process of generating and reporting the channel feedback in consideration of the two-dimensional arrangement by transmitting the feedback information to the base station according to the feedback setting of the base station.
  • the terminal may receive the configuration information of the CSI-RS configuration to the base station.
  • the terminal may check at least one of the number of ports for each CSI-RS, the timing and resource location at which each CSI-RS is transmitted, and the transmission power information based on the received configuration information.
  • the terminal configures one feedback configuration information based on at least one CSI-RS.
  • the terminal may estimate a channel between the plurality of transmit antennas provided in the base station and the plurality of receive antennas provided in the terminal.
  • the terminal may generate feedback information by rank, PMI, CQI, etc. using the received feedback setting and a predefined codebook based on the virtual channel added between the estimated channel and the CSI-RS.
  • the terminal finishes the process of generating and reporting channel feedback considering the two-dimensional arrangement by transmitting feedback information to the base station at a feedback timing determined according to the feedback setting of the base station.
  • a method for selectively applying a SU-MIMO mode and a MU-MIMO mode by a base station as a multiple transmission mode for a UE will be described in detail.
  • the terminal should be able to estimate the CQI corresponding to each of the SU-MIMO mode and the MU-MIMO mode.
  • the CQI corresponding to the SU-MIMO mode is referred to as "SU-CQI”
  • MU-CQI the CQI corresponding to the MU-MIMO mode
  • the terminal may determine a multiple transmission mode suitable for itself based on the estimated SU-CQI and the MU-CQI, and may feed back identification information indicating the determined multiple transmission mode to the base station. To this end, it is necessary to provide a method of newly defining identification information indicating a multiple transmission mode and feeding back the newly defined identification information to a base station.
  • FIG. 11 is a diagram illustrating a control flow of determining, by the terminal, identification information indicating a multiple transmission mode in an FD-MIMO system according to various embodiments proposed in the present disclosure.
  • the UE may generate SU-CQI in step 1100.
  • the terminal may perform signal to interference plus noise ratio (SINR) based on the optimal PMI in the SU-MIMO mode.
  • SINR signal to interference plus noise ratio
  • SU-CQI Can be created.
  • Equation 1> is the SINR (measured by the k-th terminal ( ) SU-CQI ( An example of converting to) is defined.
  • the terminal may generate an MU-CQI in step 1102. For example, the terminal is based on the optimal PMI in the MU-MIMO mode SINR ( ) And the MU-CQI ( ) Can be created.
  • Equation 2 is the SINR measured by the k-th terminal ( MU-CQI ( An example of converting to) is defined.
  • Equation 2 As defined by Equation 2 above Assumes that multi-user interference is measured.
  • the terminal when measuring an SINR considering multi-user interference, the terminal may assume an environment in which two terminals are scheduled at the same time and derive the SINR based on the assumption.
  • the number of terminals simultaneously scheduled is not limited. If multiple terminals are scheduled at the same time, the most preferred MU-CQI may be selected.
  • the terminal In order to generate the MU-CQI, the terminal needs to measure multi-user interference. As an example, the terminal may measure multi-user interference using IMR. However, the terminal does not necessarily utilize IMR to measure multi-user interference.
  • the terminal may measure the strength of a signal received in one or a plurality of REs corresponding to the IMR set by the base station, and determine the strength of multi-user interference based on the measured signal strength.
  • the IMR may be configured for a specific terminal by a base station based on an arrangement according to radio resource control (RRC).
  • RRC radio resource control
  • Table 2 below shows an RRC field for an arbitrary terminal.
  • the RRC field shown in Table 2 may include a CSI-process field (CSI-ProcessId-r11 field) and an IMR configuration field (CSI-IM-ConfigId-r11 field) set by a base station for an arbitrary terminal. .
  • CSI-ProcessId-r11 field CSI-ProcessId-r11 field
  • IMR configuration field CSI-IM-ConfigId-r11 field
  • information indicating a CSI-process allocated to a user equipment by a base station may be recorded in a CSI-process field (CSI-ProcessId-r11 field), and an IMR configuration field (CSI-IM-ConfigId-).
  • r11 field may record information on an IMR resource set by a base station for an arbitrary terminal.
  • Table 3 below shows an example of the configuration of the IMR configuration field (CSI-IM-Config field).
  • the resource config constituting the IMR configuration field is, for example, 0 to 9 for a frequency division system and 0 to 9 and 20 for a time division system. It can be defined by a parameter with a value between ⁇ 25. In this case, the value defining the resource configuration may indicate the position (A to J) of the IMR in the subframe.
  • Subframe config is a parameter with a value from 0 to 154. The config period and subframe offset can be set according to each value.
  • the base station may set the IMR to be periodically located. For example, in case of transmission mode 1-9, the base station may assume one or three MU-MIMO interference assumption using one or multiple IMRs based on one CSI-process. It can be measured. In case of transmission mode 10, the base station can measure one or three multi-user interference using one or multiple IMRs based on a plurality of CSI-processes.
  • the UE may measure one interference situation using one IMR. Accordingly, the base station may report channel state information for only one or three interference situations, respectively, according to the transmission mode of the terminal.
  • the base station may configure two CSI-processes having different rank limits.
  • the base station may set up each IMR resource to measure multi-user interference.
  • one CSI-process may limit the rank to 1 or 2, and the other CSI-process may not limit the rank.
  • One CSI-process that sets the rank limit may be used to receive feedback of channel state information (MU-CQI) for MU-MIMO.
  • MU-CQI channel state information
  • IMR in addition to multi-user interference, other types of interference may also be measured in IMR.
  • additional restrictions on the use of IMR may be needed so that only multi-user interference can be measured using a specific time-frequency window.
  • the terminal may generate the SU-CQI and the MU-CQI based on the sum of the CQIs calculated for each codeword.
  • Equation 3> is a k-th terminal in the multi-rank transmission, SU-CQI ( ) And MU-CQI ( Define an example to create).
  • SU-CQI ( ) Can be defined as the sum of the SU-CQI calculated for each codeword, and MU-CQI ( ) May be defined as the sum of MU-CQI calculated for each codeword.
  • the terminal may determine whether SU transmission is suitable for the current channel environment or MU transmission using the SU-CQI and the MU-CQI previously generated in step 1104.
  • Equation 4 defines an example of determining whether SU transmission or MU transmission is suitable using SU-CQI and MU-CQI.
  • Equation 4 above Is a preset offset value for determining the multiple transmission mode.
  • the terminal is a difference between SU-CQI and MU-CQI ( ) And the preset offset value Can be compared.
  • the terminal may determine whether a difference between SU-CQI and MU-CQI is greater than or equal to a preset offset value. If the difference between the SU-CQI and the MU-CQI is greater than or equal to a preset offset value, it may mean that the MU-CQI is very low. The very low MU-CQI may indicate that the current channel environment is not suitable for transmission by the MU-MIMO mode.
  • the terminal may determine that SU transmission (SU-MIMO mode) is suitable in the current channel environment. If the difference between the SU-CQI and the MU-CQI is smaller than a preset offset value, the terminal may determine that MU transmission (MU-MIMO mode) is suitable in the current channel environment.
  • the terminal may set identification information indicating the multi transmission mode as an indicator indicating SU transmission (SU-MIMO mode). If the UE determines that the MU transmission (MU-MIMO mode) is appropriate, in step 1108, the identification information indicating the multiple transmission mode may be set as an indicator indicating the MU transmission (MU-MIMO mode).
  • the MU-CQI when the MU-CQI is calculated assuming an environment in which two terminals are scheduled at the same time, the MU-CQI has a value of 3dB lower than that of the SU-CQI in terms of transmission power. in this case, May be set to a value greater than 2, so that the CQI index interval may be designed to have an approximately 2 dB interval in the CQI table.
  • the offset value set in Equation 4 may vary depending on network operation.
  • CQI may be defined based on a CQI index defined in 3GPP LTE standard TS.36.213.
  • CQI may be replaced with SINR, maximum error correction coding rate and modulation scheme, and data efficiency per frequency, which may be utilized similarly to the maximum data rate.
  • the size of the MU-CQI was subtracted from the SU-CQI.
  • the method of comparing the difference between SU-CQI and MU-CQI is not limited to the definition in Equation 4 above.
  • SU / MU indicator (SMI) notation and feedback method for indicating a multiple transmission mode (one of SU-MIMO mode and MU-MIMO mode) selected based on SU-CQI and MU-CQI will be described.
  • the SU / MU indicator may be marked using 1 bit. For example, when the condition defined in Equation 4 is satisfied, the UE may set the SU / MU indicator to 0 to indicate that transmission according to the SU-MIMO mode may be appropriate. If the condition defined in Equation 4 is not satisfied, the UE may set the SU / MU indicator to 1 to indicate that transmission according to the MU-MIMO mode may be appropriate. Contrary to the previous proposal, it is of course possible to set the SU / MU indicator. That is, 1 may be used as the SU / MU indicator that prefers the SU-MIMO mode, and 0 may be used as the SU / MU branch that prefers the MU-MIMO mode.
  • the terminal may perform feedback based on one of four feedback modes (feedback mode or reporting mode) defined below in consideration of the type of periodic feedback information.
  • 4.Reporting mode 2-1 RI, wCQI, sCQI, PMI
  • the feedback timing of each information for the four feedback modes may be determined by values of N pd , N OFFSET, CQI , M RI , N OFFSET, RI, and the like transmitted as a higher layer signal.
  • the transmission period of wCQI is N pd subframes, and feedback timing is determined with subframe offset values of N OFFSET and CQI .
  • the transmission period of RI is Subframe, offset is N OFFSET, CQI + N OFFSET, RI .
  • a method of feeding back the SU / MU indicator may be classified as follows according to the CQI feedback method.
  • the scenario of feeding back the SU / MU indicator on the basis of wCQI can be applied for all four defined feedback modes, and the scenario of feeding back the SU / MU indicator on the basis of sCQI is defined.
  • One of four feedback modes may be applied for feedback modes 2-0 and 2-1.
  • a scenario in which the SU / MU indicator is fed back to wCQI and sCQI may be applied to feedback modes 2-0 and 2-1 among four defined feedback modes.
  • FIG. 12 is a diagram illustrating a scenario in which a UE feeds back a SU / MU indicator based on wCQI in an FD-MIMO system according to various embodiments proposed in the present disclosure.
  • the UE may report a 1-bit SU / MU indicator (SMI) to the base station. If the SU / MU indicator (SMI) indicates that SU-MIMO is preferred, it may be assumed that sCQI also prefers SU-MIMO mode. If the SU / MU indicator (SMI) indicates that MU-MIMO is preferred, it may be assumed that sCQI also prefers MU-MIMO mode.
  • SMI 1-bit SU / MU indicator
  • the feedback modes 1-0 and 1- of the four feedback modes Can be applied for one.
  • feedback timing can be defined for RI and wCQI. At this time, the timing (0 to 20) represents the subframe index.
  • Feedback mode 1-1 has the same feedback timing as feedback mode 1-0. That is, the feedback mode 1-0 and the feedback mode 1-1 have the same timing for transmitting wCQI, which is a timing for transmitting the SU / MU indicator (SMI).
  • the feedback timing defined only for feedback mode 1-1 is defined for feedback mode 1-0 in that the PMI is sent together at the timing of sending wCQI for one, two antenna port or some four antenna port situations. Can be distinguished from the feedback timing.
  • the scenario of feeding back the SU / MU indicator based on wCQI is applied to feedback modes 1-0 and 1-1, but may also be applied to feedback modes 2-0 or 2-1.
  • the feedback period for sCQI is N pd subframe
  • the offset value is N OFFSET, CQI
  • the feedback period for wCQI is Subframe
  • the offset value is N OFFSET, RI . That is, in feedback mode 2-0, the offset value is the same but the feedback period is different.
  • H It can be defined as.
  • K is transmitted as a higher signal
  • J is a value that can be determined according to the system bandwidth. For example, J for a 10 MHz system may be defined as three.
  • wCQI may be transmitted once instead of sCQI after H sCQI transmission
  • SU / MU indicator may also be transmitted together with wCQI once every H sCQI transmission.
  • the period of RI Subframe, and the offset is to be.
  • FIG. 13 is a diagram illustrating a scenario in which a UE feeds back a SU / MU indicator based on sCQI in an FD-MIMO system according to various embodiments proposed in the present disclosure.
  • the terminal may report a 1-bit SU / MU indicator (SMI) to the base station.
  • SMSI 1-bit SU / MU indicator
  • feedback timing may be defined for RI, sCQI, and wCQI.
  • Feedback mode 2-1 has the same feedback timing as feedback mode 2-0. That is, the feedback mode 2-0 and the feedback mode 2-1 have the same timing for transmitting sCQI, which is a timing for transmitting the SU / MU indicator (SMI).
  • the feedback timing defined only for feedback mode 2-1 is defined for feedback mode 2-0 in that the PMI is sent together at the timing of sending wCQI for one, two antenna ports or some four antenna port situations. Can be distinguished from the feedback timing.
  • FIG. 13 illustrates a scenario in which the SU / MU indicator is fed back based on the sCQI in some cases where the number of CSI-RS antenna ports is one, two, or four. However, even if the CSI-RS is allocated to some other 4 antenna ports or 8 antenna ports, the scenario of feeding back the SU / MU indicator based on the sCQI may be applied.
  • the UE that is allocated the CSI-RS for another some 4 antenna ports or 8 antenna ports may feed back two pieces of PMI information.
  • FIG. 14 is a diagram illustrating a scenario in which a UE feeds back a SU / MU indicator in each of wCQI and sCQI in an FD-MIMO system according to various embodiments proposed in the present disclosure.
  • the first SMI may be fed back when the wCQI is transmitted, and the second SMI may be fed back when the sCQI is transmitted.
  • the feedback mode 1-1 may be divided into two sub modes.
  • the RI in the first sub mode, the RI may be transmitted together with the first PMI information and the second PMI information may be transmitted together with the wCQI.
  • the feedback period and offset for wCQI and the second PMI are Wow
  • the feedback period and offset values of the RI and the first PMI information may be defined as Wow It can be defined as.
  • the first and second PMIs in the set of precoding matrices (codebook) shared by the terminal and the base station are shared. It can be confirmed that the precoding matrix W ( i 1 , i 2 ) corresponding to the combination of is a precoding matrix preferred by the terminal.
  • the UE and the base station determine that the UE's preferred precoding matrix is a product of two matrices. Share information that W 1 W 2 is determined.
  • precoding type indicator (PTI) information may be added to the feedback information.
  • PTI precoding type indicator
  • the PTI is fed back with the RI, the period is Subframe, and the offset is Is defined as
  • wCQI is transmitted with the wideband second PMI, and sCQI is fed back with the narrowband second PMI at a separate timing.
  • the first PMI is not transmitted, and when the PTI is 0, the second PMI and the CQI are calculated after the first PMI is reported.
  • the period and offset of the PTI and RI are the same as when the PTI is zero.
  • the cycle of sCQI Defined as a subframe, and the offset It can be defined as.
  • wCQI and the second PMI Cycle and It can be fed back with an offset of. in this case, May be defined as when the number of CSI-RS antenna ports is two.
  • the scenario of feeding back the SU / MU indicator may be applied to aperiodic feedback of the terminal.
  • the base station wants to obtain aperiodic feedback information of a specific terminal, the base station provides specific aperiodic feedback to the aperiodic feedback indicator included in downlink control information (DCI) for uplink data scheduling of the terminal. It is set to perform uplink data scheduling of the terminal.
  • DCI downlink control information
  • the terminal When the terminal receives an indicator configured to perform aperiodic feedback in the nth subframe, the terminal performs uplink transmission including aperiodic feedback information when transmitting data in the n + kth subframe.
  • k may be 4 in frequency division duplexing (FDD).
  • Table 4 below defines k corresponding to each subframe in time division duplexing (TDD).
  • Table 4 defines k values for each subframe number n in the TDD UL / DL configuration.
  • the feedback information may include RI, PMI, CQI, and SMI as in the case of periodic feedback.
  • the RI and the PMI may not be fed back according to the feedback setting.
  • the CQI may include both wCQI and sCQI or may include only wCQI.
  • CSI for MU-MIMO is defined in future LTE standard
  • the terminal may use SU- using Equation (1), Equation (2) or Equation (3).
  • CQI and MU-CQI can be measured.
  • the terminal determines whether SU-MIMO transmission is suitable for the current channel state or MU-MIMO transmission using Equation 4 above.
  • the terminal may feed back the SMI to the base station using 1 bit.
  • RI, PMI, and CQI fed back together are CSIs that are fed back assuming SU-MIMO transmission. Therefore, if 1-bit SMI prefers SU-MIMO transmission, the base station can use the fed back RI, PMI, CQI information. If the 1-bit SMI prefers MU-MIMO transmission, the base station can assume the SU-MIMO transmission and regenerate the RI, PMI and CQI for MU-MIMO based on the fed back RI, PMI and CQI information. have.
  • the terminal may be fed back the actual MU-CSI information to the base station according to the SMI.
  • the SU-CSI always feeds back, and the MU-CSI may further consider feeding back according to the SMI.
  • the SU-CSI may be considered to feed back only the MU-CSI, not the feedback.
  • a method for generating channel state information for performing effective data transmission and reception in the LTE-A based FD-MIMO system, and sharing the generated channel state information between the base station and the terminal I want to prepare is proposed.
  • the base station generates configuration information for a plurality of CSI-RS (hereinafter referred to as "reference signal configuration information") so that efficient data transmission / reception can be performed, and the generated reference signal configuration information to the terminal Will arrange for operations and procedures.
  • the base station will be proposed to improve the CSI-RS configuration method is limited to 1 (or 2), 4, 8 to configure a variety of CSI-RS.
  • the base station may configure and provide a reference signal resource for measuring channels according to eight or more antennas to the terminal.
  • the number of reference signals that will constitute the reference signal resource may be differently applied by the configuration and measurement type of antennas provided in the base station.
  • the terminal measures downlink channel state based on reference signal configuration information known by the base station, generates feedback information corresponding to the measured downlink channel state, and generates the generated feedback information.
  • An operation and procedure for delivering to the base station will be prepared.
  • FIG. 15 is a diagram illustrating a configuration example of a CSI-RS for antenna configuration and measurement in a large multi-antenna system according to various embodiments proposed in the present disclosure.
  • the configuration of the CSI-RS may be divided into a full measurement method and a partial measurement method.
  • the overall measurement method is a method of estimating CSI-RS ports for all TXRUs used for data transmission
  • the partial measurement method is a method of estimating CSI-RS ports for some of TXRUs used for data transmission.
  • the overall measurement method is the number of horizontal ports, as indicated at 1510. And vertical number of ports In addition, various numbers of CSI-RSs may be required depending on the polarization antenna.
  • a first TXRU 1530 having a CSI-RS port is a TXRU through which channel estimation is performed through the CSI-RS
  • a second TXRU 1540 without a CSI-RU port is performed through a channel estimation through the CSI-RS. TXRU not supported.
  • the reference number 1522 may be used by the UE to determine horizontal channel direction information through three horizontal CSI-RS ports.
  • the CSI-RS transmitted through three CSI-RS ports in the vertical direction may be used by the terminal to determine channel direction information in the vertical direction.
  • Reference numeral 1524 indicates that when the array is large and a cross-pol antenna is used, a large number of CSI-RSs are required even when partial estimation is performed.
  • the TXRU allocation pattern shown at 1520 is only an example of puncturing the CSI-RS port for partial measurement, and various other puncturing patterns may be applied.
  • the partial estimation method may have a larger channel estimation error than the overall estimation method, but may save CSI-RS resources.
  • CSI-RS configuration method As described above, in the current system, up to eight CSI-RSs can be set per base station. Therefore, in order to support an FD-MIMO system requiring eight or more CSI-RSs, a CSI-RS configuration method is required. There needs to be a new arrangement.
  • the scheme using a plurality of CSI-processes proposes to perform a CSI-process by each of a plurality of CSI-RS configurations that limit the number of CSI-RSs that can be supported.
  • the scheme using one CSI-process proposes to perform one CSI-process by multiplexing a plurality of CSI-RS configurations which limit the number of CSI-RSs that can be supported.
  • FIG. 16 illustrates an example of configuring a plurality of CSI-processes for configuring a plurality of CSI-RSs in an FD-MIMO system according to an embodiment proposed in the present disclosure.
  • the base station may configure a plurality of CSI processes 1610, 1620, and 1630, each of which may support up to eight CSI-RSs.
  • the UE may perform channel estimation on a large number of CSI-RS ports through a plurality of CSI processes 1610, 1620, and 1630.
  • Each of the plurality of CSI processes 1610, 1620, and 1630 configures a CSI-RS configuration (CSI-RS configuration # 1, # 2 to #N) 1612, 1622, and 1632, and configures feedback information. It may include the steps (feedback configuration # 1, # 2 to #N) (1614, 1624, 1634).
  • the RI, PMI, and CQI of the feedback information (feedback configuration # 1, # 2 to #N) 1614, 1624, 1634 are configured in advance to configure feedback information constituting each of the plurality of CSI processes 1610, 1620, and 1630. They can be linked to one another by a promise. Accordingly, the base station may perform reconstruction of one piece of final feedback information based on the feedback information (RI, PMI, and CQI) obtained for each of the plurality of CSI processes 1610, 1620, and 1630 (1640). .
  • Restoration of feedback information by the base station determines a precoding matrix from a plurality of RIs and a plurality of PMIs acquired in a plurality of CSI processes 1610, 1620, and 1630, and in a plurality of CSI processes 1610, 1620, and 1630.
  • MCS may be determined from the obtained multiple CQIs.
  • the base station may determine the precoding matrix for the entire channel by Kronecker product of the first PMI reported through the first CSI process 1610 and the second PMI reported through the second CSI process 1620.
  • the joint CQI may be used as a product of the first CQI reported through the first CSI process 1610 and the second CQI reported through the second CSI process 1620.
  • the CSI-RS pattern in each of the plurality of CSI processes 1610, 1620, and 1630 need not be newly designed.
  • the CQI is reported separately by a certain law, or a new CQI needs to be defined.
  • FIG. 17 is a diagram illustrating an example of configuring one CSI-process for configuring a plurality of CSI-RSs in an FD-MIMO system according to an embodiment proposed in the present disclosure.
  • the base station may configure one CSI process to include a plurality of CSI-RS ports corresponding to eight or more.
  • the UE may perform channel estimation on a plurality of CSI-RS ports corresponding to eight or more through one CSI process.
  • the CSI process includes configuring a CSI-RS configuration (new CSI-RS configuration) 1710, configuring a feedback information (new feedback configuration) 1720, and restoring the feedback information (CSI reconstruction). 1730 may be included.
  • the base station In the step of configuring the CSI-RS configuration (New CSI-RS configuration) (1710), the base station directly informs the RE location of each port, the port configuration pattern, or informs the information related to the existing CSI-RS group
  • the CSI-RS port configuration information may be generated by various methods, and the generated CSI-RS port configuration information may be transmitted to the terminal.
  • the UE In the step of configuring the feedback information (new feedback configuration) 1720, the UE generates feedback information such as RI, PMI, CQI, etc. based on the CSI-RS port configuration information received from the base station and the preset feedback configuration information. Can be. At this time, the rank and direction of the channel may be reported as one or several RI and PMI according to a predetermined rule. The quality of the channel may also be reported divided into several CQIs.
  • the CSI reconstruction 1730 does not necessarily have to use a single CQI, but may also use multiple CQIs.
  • the existing CQI can be used as it is without defining a new CQI, but it may be necessary to design a new CSI-RS pattern or a new CSI-RS configuration method.
  • the base station may directly inform the arbitrary terminal of the start position and / or the end position of the CSI-RS resource allocated for the arbitrary terminal.
  • the base station may be able to notify the terminal of the start position and / or end position of the CSI-RS resource using a preset table.
  • Table 5 below shows an example of a predefined table to notify the UE of the start position and / or end position of the CSI-RS resource.
  • k ' is an index indicating a sub-carrier defining a start time of CSI-RS resources according to CSI-RS configuration
  • l ' is an index indicating a symbol position defining a start time of a CSI-RS resource according to a CSI-RS configuration.
  • the base station may inform the arbitrary terminal of the start position and / or end position of the CSI-RS resource allocated for the arbitrary terminal.
  • the base station may inform the arbitrary terminal of the start position of the CSI-RS resource allocated for the arbitrary terminal and the size of the allocated CSI-RS resource.
  • the base station may perform notification of CSI-RS resource configuration in various cases to the arbitrary terminal.
  • the CSI-RS port index may be allocated in ascending or descending order.
  • FIG. 18 is a diagram illustrating an example of a configuration of a CSI-RS in an FD-MIMO system according to various embodiments of the present disclosure.
  • Reference numeral 1810 indicates a start position of the allocated CSI-RS resource
  • reference numeral 1820 indicates an end position of the allocated CSI-RS resource calculated according to the setting.
  • the reference number 1820 may be notified directly to the terminal as shown by reference number 1810.
  • the base station may inform the arbitrary terminal by the combination of the CSI-RS resources allocated for the arbitrary terminal.
  • the combination may be, for example, a combination of a number of CSI-RS configurations included in one CSI process and the number of antenna ports corresponding to one CSI-RS configuration.
  • the combination may define antenna ports for any terminal to measure the downlink channel state.
  • this may allow the base station to combine multiple legacy CSI-RS configurations in order to configure various numbers of CSI-RS ports.
  • the base station may instruct to generate channel information by linking a plurality of CSI-RS configuration information to be provided through the one CSI process. have.
  • FIG. 19 is a diagram illustrating a configuration example for associating multiple CSI-RS configurations with one CSI process according to various embodiments of the present disclosure.
  • the base station may record information designating various numbers of CSI-RS ports in the antennaPortsCount-r13 field constituting the CSI-RS configuration 1910.
  • the antennaPortsCount a precise location corresponding to each of the CSI-RS ports of various number of records in -r13 field may be defined by a plurality of legacy CSI-RS configuration (1920).
  • the total number of CSI-RS ports recorded in the antennaPortsCount -r13 field will be the sum of the number of CSI-RS ports recorded in the antennaPortsCount -r10 field constituting each of the plurality of legacy CSI-RS configurations 1920. Can be.
  • the CSI- RS -Set- -r13 Config field and CSI- RS - terms such as Config -r10 field it is understood that as named for convenience of description, be expressed differently according to the actual application conditions.
  • 20 is a diagram illustrating an example of generating CSI using a plurality of CSI-RS resource locations according to various embodiments proposed in the present disclosure.
  • CSI may be generated using a plurality of CSI-RS resource locations.
  • the UE When using the resource location shown in Table 5, the UE measures the channel status of the 20 CSI-RS ports included in the specified resources (2010, 2020, 2030), and the result according to the measurement Based on the CQI can be generated.
  • N CSI is the number of CSI-RS ports included in each configuration ( antennaPortCount-r10 in FIG. 19), and N P is the total number of CSI-RS ports set by the base station ( antennaPortCount-r13 in FIG. 19).
  • N CSI And the CSI-RS port index in a descending / increasing order for configuration indexes such as resourceConfig .
  • N P is 4, set to the following three CSI-RS configurations, such as one of the CSI- RS -Set- Config -r13.
  • each CSI-RS configuration includes the CSI-RS of the following index.
  • config . 0 ⁇ 15,16,17, Number 18 CSI- RS port
  • config . 1 CSI at ⁇ 23,24,25,26,27,28,29,30 ⁇ RS port
  • config . 2 CSI- ⁇ 19,20,21,22 ⁇ RS port
  • the CSI-RS port index starts from No. 15 as in the LTE / LTE-A system.
  • each of the CSI-RS ports may be arranged in ascending / descending order according to the order of the CSI-RS configuration. According to this, in the situation as in the above example, CSI-RS ports will be mapped to each CSI-RS configuration as follows.
  • config . 0 ⁇ 15,16,17, Number 18 CSI- RS port
  • config . 1 CSI at ⁇ 19,20,21,22,23,24,25,26 ⁇ RS port
  • config . 2 CSI- ⁇ 27,28,29,30 ⁇ RS port
  • the base station may randomly assign the order of the CSI-RS configuration to the terminal. For example, if you specify in the order of config.2-config.0-config.1, the CSI-RS ports will be mapped to each CSI-RS configuration as follows.
  • config . 0 ⁇ 19,20,21, Number 22 CSI- RS port
  • config . 1 CSI at ⁇ 23,24,25,26,27,28,29,30 ⁇ RS port
  • config . 2 CSI- ⁇ 15,16,17,18 ⁇ RS port
  • the resource location of a separate CSI-RS configuration contained in CSI- RS -Set- Config -r13 will be apparent hereinafter, must not overlap.
  • the base station may be configured to overlap some CSI-RS resources by a specific intention. For example, when one or two CSI-RS resources are set to overlap, the terminal is used to simultaneously generate CSI-RS ports of the corresponding position to generate channel state information in the horizontal direction and the vertical direction. Can be determined.
  • the channel state information in the horizontal and vertical directions has the same meaning as the channel state information in the first and second dimensions.
  • the location of the specific CSI-RS port according to the individual CSI-RS configuration may be determined according to Equation 5 below.
  • Equation 5 p is a CSI-RS port index in a separate CSI-RS configuration.
  • Equation 6 The actual CSI-RS port index for that CSI-RS configuration
  • p for the nth port of the CSI-RS configuration can be calculated by Equation 6 below.
  • the CSI-RS port index is sequentially increased. However, when performing the partial measurement, the CSI-RS port index may be discontinuously increased. This will be described in detail later.
  • the base station may directly inform the arbitrary terminal of the CSI-RS resource allocated for the arbitrary terminal using a bitmap.
  • the base station allocates CSI-RS resources for an arbitrary terminal, configures information indicating a location of the allocated CSI_RS resources in a preset unit resource allocation region in a bitmap format, and configures the configured bitmap in the arbitrary Can be delivered to the terminal.
  • the preset unit resource allocation region may be defined by 12 subcarriers for dividing a frequency domain and 14 symbols for dividing a time domain.
  • the preset unit resource allocation region may include 168 REs.
  • the base station may allocate CSI-RS resources using the REs of a preset position among the 168 REs.
  • the location RE usable as the CSI-RS resource may exist from A0 to J1 as shown in FIG. 20. Two REs may be mapped to positions corresponding to A0 to J1.
  • the base station transmits a bitmap indicating whether to allocate each resource (RE or A0 to J1) existing in the preset unit resource allocation region to the terminal using high layer (eg, RRC layer) signaling or L1 signaling.
  • high layer eg, RRC layer
  • L1 signaling L1 signaling.
  • 1 may indicate that the corresponding resource is allocated for transmission of the CSI-RS
  • 0 may indicate that the corresponding resource is not allocated for transmission of the CSI-RS.
  • the bitmap may notify the UE of information on resources to which the CSI-RS is transmitted in a preset unit resource allocation region.
  • [A0, A1, B0, B1, C0, C1, D0, D1, E0, E1, F0, F1, G0, G1 , H0, H1, I0, I1, J0, J1] [1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1 , 1, 1] can form a bitmap.
  • resources corresponding to A0, A1, G0, G1, H0, H1, I0, I1, J0, J1 are indicated to be allocated as CSI-RS resources.
  • the bitmap may notify the UE of information on resources to which the CSI-RS is transmitted in a preset unit resource allocation region.
  • [A0-A1, B0-B1, C0-C1, D0-D1, E0-E1, F0-F1, G0-G1 , H0-H1, I0-I1, J0-J1] [1, 0, 0, 0, 0, 0, 0, 1, 1].
  • bitmap it is indicated that resources corresponding to A0, A1, I0, I1, J0, J1 are allocated to CSI-RS resources.
  • the bitmap may notify the UE of information on resources to which the CSI-RS is transmitted in a preset unit resource allocation region.
  • [A0-A1-B0-B1, C0-C1-D0-D1, E0-E1-F0-F1, G0-G1 -H0-H1, I0-I1-J0-J1] [1, 0, 0, 1, 1] can configure a bitmap.
  • resources corresponding to A0, A1, B0, B1, G0, G1, H0, H1, I0, I1, J0, J1 are indicated to be allocated as CSI-RS resources.
  • CSI-RSs can be transmitted in a smaller number of REs than the configured resources. For example, according to the bitmap based on the eight CSI-RS ports, it is notified that the A0-A1-B0-B1 resource is used, but the CSI-RS is transmitted only at the A0-A1 location as shown in the example of FIG. The CSI-RS may not be transmitted at the B0-B1 position.
  • port index mapping may be sequentially provided based on the LSB or the MSB of the bitmap.
  • the bitmaps indicating the location of resources are [A0-A1, B0-B1, C0-C1, D0-D1, E0-E1, F0-F1.
  • G0-G1, H0-H1, I0-I1, J0-J1] [1, 0, 0, 0, 0, 0, 0, 1, 1].
  • the base station may map the CSI-RS port index based on the LSB of the bitmap.
  • the UE maps CSI-RS ports corresponding to 15, 16, 17, and 18 to J0-J1, and maps CSI-RS ports corresponding to 19, 20, 21, and 22 to I0-I1. It can be seen that the CSI-RS pods corresponding to Nos. 23, 24, 25, and 26 are mapped to A0-A1.
  • the base station maps the CSI-RS port index based on the MSB of the bitmap, the order of four CSI-RS ports allocated to the CSI-RS resources will be reversed.
  • a method for allowing a terminal to recognize an antenna arrangement of a base station may be prepared.
  • the terminal may determine the relative position of the base station antenna according to the CSI-RS port index to generate channel state information. Should be The relative position of the base station antenna may be defined by the relationship between the CSI-RS and the codebook index.
  • FIG. 21 is a diagram illustrating an example in which a base station maps CSI-RS resources and CSI-RS port indexes according to various embodiments proposed in the present disclosure.
  • the base station maps the CSI-RS resource and the CSI-RS port index based on the horizontal direction (left side of FIG. 21) or the CSI-RS resource and the CSI-RS based on the vertical direction.
  • the port index may be mapped (as shown in the right side of FIG. 21).
  • the base station may sequentially assign the CSI-RS port indexes 15 to 19 while moving in the horizontal direction from the CSI-RS resource located first in the lower left corner of the CSI-RS resource array. have. Subsequently, the base station may sequentially assign the CSI-RS port indexes 20 to 24 while moving in the vertical direction and moving in the horizontal direction in the CSI-RS resource located second from the lower left. In the same manner, CSI-RS port indexes 25 to 29 may be sequentially assigned to the remaining CSI-RS resources.
  • the base station may sequentially assign the CSI-RS port indexes 15 to 17 while moving in the vertical direction from the CSI-RS resource located at the lower left of the CSI-RS resource array. .
  • the base station may sequentially assign the CSI-RS port indexes 18 to 20 while moving in the horizontal direction and moving in the vertical direction in the CSI-RS resource located at the second lower left corner.
  • CSI-RS port indexes 21 to 29 may be sequentially assigned to the remaining CSI-RS resources.
  • the UE can recognize the mapping rule of the CSI-RS resources and the CSI-RS port index by the base station, it can predict the arrangement of the antenna of the base station.
  • the base station to the terminal may recognize the mapping relationship between the CSI-RS resources and the CSI-RS port index as shown in FIG.
  • the non-polarized antenna is shown as a reference.
  • the mapping of the CSI-RS resource and the CSI-RS port index may be performed in a similar manner.
  • the base station may not transmit the CSI-RS in all the CSI-RS resources allocated for the transmission of the CSI-RS. That is, if the partial measurement, the base station may perform CSI-RS puncturing for the CSI-RS resources allocated for any terminal. In this case, the base station should be able to inform the UE about which TXRU transmitted the CSI-RS.
  • the base station may use a cross point indication method, a bitmap indication method, a hybrid bitmap indication method, or the like for information on the TXRU for transmitting the CSI-RS.
  • the proposed method 1 proposes a method for the UE to recognize the CSI-RS puncturing pattern by using the location of the intersection reference signal provided by the base station.
  • the terminal is configured to configure the antenna information of the base station If is known, the terminal is the location of the intersection reference signal Only the CSI-RS puncturing pattern in the base station can be recognized.
  • the antenna configuration information of the base station Is information defining an antenna array (or CSI-RS pattern) according to the number of antennas N H in the horizontal direction and the number of antennas N V in the vertical direction.
  • Location of the intersection reference signal Is antenna configuration information of the base station CSI-RS resources (CSI-RS ports) arranged in the horizontal direction and CSI-RS resources (CSI-RS ports) arranged in the vertical direction intersect in the antenna array (or CSI-RS pattern) according to Can be a location.
  • the base station may provide the terminal to the terminal through high-layer signaling or dynamic signaling.
  • the position of the obtained crossing reference signal in the antenna array (or CSI-RS pattern) Are mapped to the remaining antennas (or CSI-RS ports) except for antennas (or CSI-RS ports) arranged horizontally with respect to the antennas (or CSI-RS ports) arranged vertically. It may be possible to obtain a CSI-RS puncturing pattern that punctures CSI-RS resources.
  • the base station antenna configuration information to enable the terminal to recognize the antenna array (or CSI-RS pattern)
  • the position of the intersection reference signal To inform the terminal. Location of the intersection reference signal May be directly transmitted by the base station to the terminal or implicitly by the base station to the terminal through a codebook configuration.
  • FIG. 22 is a diagram illustrating examples of locations of intersection reference signals according to various embodiments proposed in the present disclosure.
  • a position 2210 or 2220 of an intersection reference signal means a position of a reference signal used to measure both a horizontal channel component and a vertical channel component.
  • Is 5 If the location of the intersection reference signal is (0,0) in the situation of 3, the UE can infer the CSI-RS puncturing pattern used in the base station as shown in the left figure of FIG. As another example, Is 5, If the location of the intersection reference signal is (2,1) at 3, the UE can infer the CSI-RS puncturing pattern used in the base station as shown in the right figure of FIG.
  • the base station configures a bitmap (or bit string) indicating whether or not to puncture (CSI-RS transmission) corresponding to each of a predetermined number of CSI-RS ports, and provides the configured bitmap to the terminal.
  • CSI-RS transmission CSI-RS transmission
  • the base station determines the number of bits
  • the in-bit sequence may be delivered to the terminal through signaling in a higher layer.
  • the number of bits constituting the bit sequence May correspond to the total number of CSI-RS ports. Composing the bit sequence Bits and a predetermined number of CSI-RS ports may be mapped one-to-one.
  • one bit value constituting the bit sequence may indicate whether the CSI-RS is transmitted from one corresponding CSI-RS port among the CSI-RS ports. For example, if a value of a specific bit is 0, it indicates that CSI-RS transmission is not performed at the CSI-RS port corresponding to the specific bit (CSI-RS is off). This indicates that CSI-RS transmission is performed on the CSI-RS port corresponding to the specific bit (CSI-RS is on).
  • FIG. 23 is a diagram illustrating an example of allowing a terminal to recognize a CSI-RS puncturing pattern of a base station using a bitmap according to various embodiments proposed in the present disclosure.
  • FIG. 23 Is 4, It is assumed that a cross pole antenna with 2 is used.
  • the left figure defines a relative position according to the CSI-RS port index assigned to each of the CSI-RS ports, and indicates whether each of the CSI-RS ports transmits the CSI-RS. For example, colored CSI-RS ports among the CSI-RS ports represent TXRUs to which the CSI-RSs are transmitted, and uncolored CSI-RS ports among the CSI-RS ports represent TXRUs to which the CSI-RSs do not transmit.
  • the right figure shows a bit sequence (or bitmap) consisting of bits indicating whether CSI-RS is transmitted on each of the CSI-RS ports.
  • bit sequence the first bit, that is, the rightmost bit 2320 may correspond to the LSB, and the last bit, that is, the leftmost bit 2310 may correspond to the MSB.
  • the value of the LSB 2320 constituting the bit sequence is set at the CSI-RS port having the CSI-RS port index of 15. It will indicate whether the CSI-RS is transmitted. Subsequent bit values thereafter will indicate whether the CSI-RS port index is increased from 16 to 1 by CSI-RS on the CSI-RS port. The last bit value, that is, the value of the MSB 2310, will indicate whether the CSI-RS is transmitted on the CSI-RS port having the CSI-RS port index of 30.
  • bit sequence shown in the right figure is finally generated based on whether the CSI-RS is transmitted in each of the CSI-RS ports shown in the left figure, and it can be confirmed that [0001111100011111].
  • bit value 0 indicates that the CSI-RS is not transmitted
  • bit value 1 indicates that the CSI-RS is transmitted.
  • the base station proposes a method for guiding the CSI-RS puncturing pattern to the UE by combining the method 1 by the intersection indication and the method 2 by the bitmap indication.
  • bitmap specifies that the CSI-RS ports for measuring the direction of one of the vertical and horizontal directions are set to 0, and the CSI-RS ports for measuring the remaining direction are set to 1.
  • the crossing reference signal may be known by allocating bits opposite to the corresponding group. For example, the location of the crossing reference signal Is ⁇ 3,1 ⁇ , the bitmap must be changed from [0 0 0 0 1 1] to [0 0 0 because the bits of the fourth CSI-RS port in the horizontal direction and the second CSI-RS port in the vertical direction must be changed. 1 1 0].
  • FIG. 24 is a diagram illustrating an example of recognizing a CSI-RS puncturing pattern by a composite bitmap indication according to various embodiments proposed in the present disclosure.
  • Is 4 It is assumed that an orthogonal polarization antenna with 2 is used.
  • the left figure in Figure 23 is Is 0, Shows the bitmap sequence for the location of the intersection reference signal with 0.
  • Is 2 Shows a bitmap sequence for the position of an intersection reference signal with a 1.
  • the result of the bitmap sequence may be changed according to the above detailed definition (bit allocation for each CSI-RS port group, etc.).
  • a base station may provide a scheme for sharing information indicating whether the base station uses CSI-RS resources with the terminal. This is to prevent additional interference or noise may occur due to CSI-RS resources in which CSI-RSs are not transmitted among CSI-RS resources allocated for any UE.
  • the base station may inform the terminal of information about a null location in which the CSI-RS is not present.
  • the base station may instruct the terminal which codebook coefficients are not used to generate channel state information.
  • FIG. 25 is a diagram illustrating an example of a known CSI-RS not used in an FD-MIMO system according to various embodiments proposed in the present disclosure.
  • the base station allocates eight CSI-RS resources for the terminal, and the allocated eight CSI-RS resources. Three CSI-RS resources may not transmit the CSI-RS.
  • interference or noise may additionally occur in the three CSI-RS resources that the CSI-RS will not transmit.
  • the base station uses the CSI-RS puncturing pattern indicating at least one CSI-RS resource in which the CSI-RS transmission is not performed among the CSI-RS resources allocated for the arbitrary terminals by various methods. Can be announced to. As a result, unnecessary degradation of performance may be prevented because CSI-RS is not transmitted in some CSI-RS resources among allocated CSI-RS resources.
  • a base station maps at least two CSI-RS resources among a plurality of CSI-RS resources configured to configure CMR to one CSI-RS port. can do. That is, we propose a CMR operation scheme in which each CSI-RS resource shares some CSI-RS port indexes.
  • FIG. 26 is a diagram illustrating an example in which each CSI-RS resource shares some CSI-RS port index in an FD-MIMO system according to various embodiments proposed in the present disclosure.
  • one CMR may be configured by a total of three CSI-RS resource components 2610, 2620, and 2630.
  • the three CSI-RS resource elements 2610, 2620, and 2630 CSI-RS port indexes 15 to 18 may be seen.
  • Each of the three CSI-RS resource elements 2610, 2620, and 2630 may be treated as independent resources. In this case, each of the three CSI-RS resource elements 2610, 2620, and 2630 may be used to generate different CSIs.
  • the base station may apply different beamforming weights to each of the three CSI-RS resource elements 2610, 2620, and 2630, and transmit the CSI-RS to the terminal based on the different beamforming weights.
  • the terminal may generate a CSI based on a CSI-RS resource index and a CSI-RS port of the corresponding CSI-RS resource.
  • the terminal may report the generated CSI to the base station.
  • the base station may transmit different beamforming weights to each of the three CSI-RS resource elements 2610, 2620, and 2630 to the terminal.
  • the terminal may generate the CSI based on the CSI-RS ports transmitted from each CSI-RS resource, and report all of the generated CSI to the base station.
  • FIG. 27 is a diagram illustrating another example in which each CSI-RS resource shares some CSI-RS port index in an FD-MIMO system according to various embodiments proposed in the present disclosure.
  • some CSI-RS resources may be associated with each other, and other CSI-RS resources may be operated as independent resources.
  • one CMR may be configured by a total of three CSI-RS resource elements 2710, 2720, and 2730.
  • Two CSI-RS resource elements 2710 and 2730 of the three CSI-RS resource elements 2710, 2720, and 2730 may be linked to each other to operate as one CSI-RS resource, and the other one resource may be used.
  • Element 2720 may operate as a separate CSI-RS resource.
  • the UE may generate one CSI based on CSI-RS ports transmitted from two CSI-RS resource elements 2710 and 2730 that are linked to each other and operate as one CSI-RS resource.
  • the terminal may generate another CSI based on the CSI-RS port transmitted from one CSI-RS resource element 2720 operated as a separate CSI-RS resource.
  • the terminal will be able to report the index of the preferred CSI-RS resource and the corresponding CSI to the base station by using the other CSI.
  • the UE generates one CSI based on CSI-RS ports transmitted from two CSI-RS resource elements 2710 and 2730 that are linked to each other and operated as one CSI-RS resource, and separate CSIs. Create another CSI based on the CSI-RS port transmitted from one CSI-RS resource element 2720 operated as an RS resource, and use the two CSIs as their preferred CSI- It is possible to report the index of the RS resource and the corresponding CSI to the base station.
  • the FD-MIMO system may prepare a signaling procedure in an upper layer for configuring one or more CSI-RS resources for CMR configuration.
  • FIG. 28 is a diagram illustrating an example of one CSI process in which a plurality of CSI-RSs are set according to various embodiments proposed in the present disclosure.
  • a total of N non-zero power (NZP) CSI-RS resources may be managed by using an ID list (reference number 2830) or by using N CSI-RS configuration lists.
  • the number of CSI-RS ports included in each CSI-RS resource may be set as shown by reference numeral 2840.
  • the number 2820 of the total CSI-RS ports may be set by one CSI process 2810. In this case, the number 2820 of the total CSI-RS ports may be equal to or less than the sum of the numbers set for each NZP CSI-RS deployment (reference 2840).
  • the total number of CSI-RS ports included in one CSI process 2810 may be defined by the total sum of the numbers (refer 2840) set for each NZP CSI-RS deployment. In this case, the number 2820 of the entire CSI-RS ports may be omitted.
  • each CSI-RS resource included in one CSI process 2810 may be configured to have the same number of CSI-RS ports.
  • the number of CSI-RS ports of each CSI-RS resource may be set by the number of total CSI-RS ports 2820, and the numbers set for the respective NZP CSI-RS deployments (reference number 2840). May be omitted.
  • the setting of the total number of CSI-RS ports 2820 is one example, and in this example, it is possible to set ⁇ an1, an2, an4, an8 ⁇ .
  • the total number of CSI-RS ports included in the CMR may be defined as the product of the number of CSI-RS ports and the number of CSI-RS resources.
  • the number of CSI-RS ports in the proposed embodiment is not limited to a specific number but may be set to include various numbers such as 30, 32, 56, and 64.
  • FIG. 29 is a diagram illustrating another example of one CSI process in which a plurality of CSI-RSs are set according to various embodiments proposed in the present disclosure.
  • N non-zero power
  • One CSI process 2910 may specify the total number of CSI-RS pods as shown at 2920. Further, the same reference numeral 2920 may also be omitted for the same reason of omitting the reference numeral 2820 described with reference to FIG. 28. Examples of the reference numerals 2820 and 2920 do not limit the number of CSI-RS ports thereto, and may be set to include various numbers such as 30, 32, 56, and 64.
  • FIG. 30 is a diagram illustrating another example of configuring CSI-RS ports according to various embodiments of the present disclosure.
  • a CSI-RS resource including CSI-RS ports other than ⁇ 1, 2, 4, 8 ⁇ based on a plurality of CSI-RS resources (Release 12 CSI-RS resources), for example
  • RRC higher layer
  • the indicator 3020 indicating the location of the CSI-RS resource is an existing CSI- when the number of CSI-RS ports designated by reference numeral 3010 is not one of ⁇ 1, 2, 4, 8 ⁇ . It may be an indicator that designates the location of one of the CMRs created by combining RS resources.
  • the number of CSI-RS ports is designated as 16 in reference numeral 3010, and the CMR constituting the 16 CSI-RS ports is composed of two CSI-RS port bundles.
  • one CSI-RS port bundle may consist of eight CSI-RS ports.
  • An indicator designated by reference numeral 3020 may indicate the use of one CMR pattern among a predetermined number of CMR patterns.
  • FIG. 31 is a diagram illustrating an example of a CMR pattern according to various embodiments of the present disclosure.
  • a total of 10 CMR patterns from A to J may be generated.
  • An indicator may be set in advance for each of the ten CMR patterns A to J.
  • the CMR pattern indication may be previously promised to use a pattern A when 0, a pattern B when 1, a pattern C when 2, and a pattern J when 9.
  • the order from the CMR patterns A to J is not important, and of course, the order may be changed according to circumstances.
  • the indicators may not be mapped to all patterns, and mapping of the indicators may be omitted for some patterns as necessary.
  • CSI-RS resources are allocated as shown in pattern A of FIG. 31. It may be possible to transmit the CSI-RS only in some CSI-RS resources (ie, reference numbers 2710 and 2730) among the allocated CSI-RS resources.
  • the four REs are used for various reasons such as CSI-RS power boosting. Can be extended to support CDM-4.
  • two CDM groups consisting of two REs may be collected to create a new CDM group, and four REs included in the new one CDM group may have a length 4 OCC (orthogonal) for the CDM-4. cover code) may be applied. It is apparent that two CDM groups consisting of the two REs may exist in the same OFDM symbol or in different OFDM symbols.
  • FIG. 32 is a diagram illustrating an example in which a CMR pattern is indicated by a resource indicator according to various embodiments of the present disclosure.
  • seven patterns A to G may correspond to patterns satisfying predetermined conditions (the conditions proposed above) among ten patterns (patterns shown in FIG. 31). Therefore, each of the seven patterns may be limited to be indicated by the resource indicator (3020 of FIG. 30).
  • the resource indicator may be A pattern to F pattern. It is possible to be limited to indicate six patterns corresponding to.
  • a CMR constituting 16 CSI-RS ports includes two CDM groups (eight CSI-RS resources corresponding to eight CSI-RS ports, respectively). Is assumed to consist of). In this case, if the legacy CSI-RS resource combination constituting the CMR is changed, the pattern may be changed.
  • a CMR containing 16 CSI-RS ports consists of four CDM groups (each containing 4 CSI-RS resources corresponding to 4 CSI-RS ports), or 12 If a CMR comprising CSI-RS ports consists of one CDM group comprising eight CSI-RS ports and one CDM group comprising four CSI-RS ports, or 12 CSI-RS ports If the assumptions differ, such as when the containing CMR consists of three CDM groups (each containing four CSI-RS resources corresponding to four CSI-RS ports), the number and shape of the patterns Can vary.
  • 33 is a diagram illustrating an example of a pattern for allocating CSI-RS resources according to various embodiments of the present disclosure.
  • 40 patterns may include, for example, a CMR including 12 CSI-RS ports including one CDM group including 8 CSI-RS ports and 4 CSI-RS ports. It is possible to set when configured in one CDM group.
  • Each of the eight CDM groups represented by the patterns A1 to A8 may include four CSI-RS ports.
  • the resource indicator like reference number 2920 is 0 (A, A1), 1 is pattern (A, A2), 2 is pattern (A, A3), 39 is pattern (E , E8) may be promised in advance.
  • the above example shows all patterns composed of an 8 port CSI-RS resource and one 4 port CSI-RS resource. As shown in FIG. 3, some patterns are considered in consideration of the CDM-4 configuration or the complexity of the UE. Selection may be limited.
  • three four-port CSI-RS resources may be limited to be located in different OFDM symbols.
  • CDM groups consisting of two REs constituting each legacy CSI-RS resource may be connected to CDM groups located in different OFDM symbols to form a new CDM group for CDM-4.
  • FIG. 34 is a diagram illustrating another example of a pattern for allocating CSI-RS resources according to various embodiments of the present disclosure.
  • three 4-port CSI-RS resources may be configured as an A1 pattern 3410, a B1 pattern 3420, and a C1 pattern 3430.
  • reference numbers 3412 and 3422 form one new CDM group
  • reference numbers 3424 and 3432 form another new CDM group
  • reference number 3434 And 3414 may form another new CDM group.
  • the four port CSI-RS patterns for configuring the 12 port CSI-RS pattern are one of ⁇ A1, A2 ⁇ of FIG. 33, one of ⁇ B1, B2, B3, B4, B5, B6 ⁇ , and It may be one of ⁇ C1, C2 ⁇ . Accordingly, it can be seen that a total of 24 12 port CSI-RS patterns are available.

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CN202110049989.5A CN112910618B (zh) 2015-03-27 2016-03-28 大规模天线系统中的资源分配设备和方法
ES16773402T ES2934716T3 (es) 2015-03-27 2016-03-28 Dispositivo y método de asignación de recursos en un sistema de antenas a gran escala
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KR1020227016796A KR102524587B1 (ko) 2015-03-27 2016-03-28 대규모 안테나 시스템에서 자원 할당 장치 및 방법
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US16/837,464 US11552758B2 (en) 2015-03-27 2020-04-01 Resource allocation device and method in large-scale antenna system
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