WO2015045696A1 - 基地局、移動局、参照信号送信方法及びチャネル品質測定方法 - Google Patents

基地局、移動局、参照信号送信方法及びチャネル品質測定方法 Download PDF

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Publication number
WO2015045696A1
WO2015045696A1 PCT/JP2014/071983 JP2014071983W WO2015045696A1 WO 2015045696 A1 WO2015045696 A1 WO 2015045696A1 JP 2014071983 W JP2014071983 W JP 2014071983W WO 2015045696 A1 WO2015045696 A1 WO 2015045696A1
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WIPO (PCT)
Prior art keywords
mapping
antenna ports
channel state
state information
csi
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Ceased
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PCT/JP2014/071983
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English (en)
French (fr)
Japanese (ja)
Inventor
佑一 柿島
聡 永田
祥久 岸山
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NTT Docomo Inc
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NTT Docomo Inc
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Publication date
Application filed by NTT Docomo Inc filed Critical NTT Docomo Inc
Priority to CN201480052271.XA priority Critical patent/CN105580468B/zh
Priority to EP14848382.9A priority patent/EP3051904B1/en
Priority to US15/024,366 priority patent/US10425852B2/en
Publication of WO2015045696A1 publication Critical patent/WO2015045696A1/ja
Anticipated expiration legal-status Critical
Priority to US15/850,808 priority patent/US10356644B2/en
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0417—Feedback systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • 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
    • H04B7/0613—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
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • 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
    • H04B7/0613—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
    • H04B7/0684—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 using different training sequences per antenna
    • 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
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H04L5/0057—Physical resource allocation for CQI
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/28—Cell structures using beam steering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space

Definitions

  • the present invention relates to a base station, a mobile station, a reference signal transmission method, and a channel quality measurement method.
  • 3GPP Three Generation Partnership Project
  • AP antenna ports
  • a plurality of antenna elements that are two-dimensionally arranged in a vertical direction and a horizontal direction are mounted on a base station, and a three-dimensional MIMO (3D-MIMO: Three Dimensional Multiple Input Multiple Output) is being studied. Improvement of system characteristics is expected by forming beams in the vertical and horizontal directions.
  • 3D-MIMO Three Dimensional Multiple Input Multiple Output
  • 3D-MIMO when the number of antenna ports is 8 or less is referred to as vertical beamforming, and when the number of antenna ports is greater than 8 (16, 32, 64, etc.), FD-MIMO (Full Dimension- MIMO).
  • FD-MIMO is often referred to as Massive MIMO.
  • Massive MIMO can improve the frequency utilization efficiency by forming a sharp beam using a large number of base station antenna elements.
  • CSI-RS Reference Signal for CSI measurement
  • CSI Channel State Information
  • FIG. 1 shows an example of CSI-RS mapping when the number of antenna ports is 8 or less.
  • RE Resource Element
  • RB Resource Block
  • transmission is performed with a transmission period of 5, 10, 20, 40, or 80 milliseconds.
  • the CSI-RS transmission period is set by RRC (Radio Resource Control) signaling.
  • FIG. 2 shows an example of a table used when specifying a CSI-RS resource configuration.
  • any index (CSI referenceCsignal configuration) from 0 to 19 in the table of FIG. 2 is used.
  • FIG. 3 shows an example of a table used when designating a CSI-RS subframe configuration.
  • the CSI-RS specified using the table of FIG. 2 is multiplexed and transmitted in a subframe with a period of 5, 10, 20, 40, or 80 milliseconds.
  • any index (CSI-RS-SubframeConfig) of 0 to 154 in the table of FIG. 3 is notified to the mobile station.
  • CSI-RS specified in Release 10 of 3GPP standard supports up to 8 antenna ports.
  • it is necessary to support an extended number of antenna ports such as 16, 32, 64, and the like.
  • An object of the present invention is to realize a CSI-RS configuration that can support an expanded number of antenna ports.
  • a base station is: A base station that communicates with a mobile station using multiple antenna ports, A reference signal mapping for channel state information measurement is generated for a plurality of antenna ports by combining mapping of reference signals for channel state information measurement for a predetermined number or less of antenna ports in a resource block.
  • a mapping information notifying unit for notifying the mobile station of information indicating the mapping,
  • a multiplexing unit that multiplexes a reference signal for channel state information measurement to a resource element in a resource block according to the generated mapping;
  • a base station is A base station that communicates with a mobile station using multiple antenna ports, A plurality of antenna ports are divided into a predetermined number of groups based on the number of reference antenna ports, and the mapping of reference signals for channel state information measurement defined for the reference antenna ports differs depending on the subframe or resource block Mapping information used to generate reference signal mapping for channel state information measurement of multiple antenna ports by using the reference signal for group channel state information measurement, and to notify the mobile station of information indicating the generated mapping A notification unit; A multiplexing unit that multiplexes a reference signal for channel state information measurement into a subframe or a resource block according to the generated mapping; A transmitter for transmitting a reference signal for channel state information measurement; It is characterized by having.
  • a mobile station is: A mobile station that communicates with a base station having multiple antenna ports, Information indicating the mapping of reference signals for measuring channel state information of a plurality of antenna ports, generated by combining the mapping of reference signals for measuring channel state information for a predetermined number or less of antenna ports in a resource block
  • a mapping information receiving unit for receiving
  • a reference signal extraction unit that extracts a reference signal for channel state information measurement based on information indicating the received mapping
  • a channel state information generation unit that generates channel state information using the extracted reference signal
  • a transmitter for transmitting the generated channel state information; It is characterized by having.
  • a mobile station is A mobile station that communicates with a base station having multiple antenna ports, A plurality of antenna ports are divided into a predetermined number of groups based on the number of reference antenna ports, and the mapping of reference signals for channel state information measurement defined for the reference antenna ports differs depending on the subframe or resource block
  • a mapping information receiving unit that receives information indicating mapping of reference signals for channel state information measurement of a plurality of antenna ports, generated by using the reference signal for channel state information measurement of a group;
  • a reference signal extraction unit that extracts a reference signal for channel state information measurement based on information indicating the received mapping;
  • a channel state information generation unit that generates channel state information using the extracted reference signal;
  • a reference signal transmission method includes: A reference signal transmission method in a base station that communicates with a mobile station using a plurality of antenna ports, A reference signal mapping for channel state information measurement is generated for a plurality of antenna ports by combining mapping of reference signals for channel state information measurement for a predetermined number or less of antenna ports in a resource block. A step of notifying the mobile station of information indicating the selected mapping; Multiplexing a reference signal for channel state information measurement on a resource element in a resource block according to the generated mapping; Transmitting a reference signal for measuring channel state information; It is characterized by having.
  • a reference signal transmission method includes: A reference signal transmission method in a base station that communicates with a mobile station using a plurality of antenna ports, A plurality of antenna ports are divided into a predetermined number of groups based on the number of reference antenna ports, and the mapping of reference signals for channel state information measurement defined for the reference antenna ports differs depending on the subframe or resource block Generating a mapping of the reference signal for measuring channel state information of a plurality of antenna ports by using the reference signal for measuring the channel state information of the group, and notifying the mobile station of information indicating the generated mapping; , Multiplexing a reference signal for channel state information measurement in a subframe or resource block according to the generated mapping; Transmitting a reference signal for measuring channel state information; It is characterized by having.
  • a channel quality measurement method includes: A channel quality measurement method in a mobile station communicating with a base station having a plurality of antenna ports, Information indicating the mapping of reference signals for measuring channel state information of a plurality of antenna ports, generated by combining the mapping of reference signals for measuring channel state information for a predetermined number or less of antenna ports in a resource block Receiving the step, Extracting a reference signal for channel state information measurement based on information indicating the received mapping; Measuring channel quality using the extracted reference signal; It is characterized by having.
  • a channel quality measurement method includes: A channel quality measurement method in a mobile station communicating with a base station having a plurality of antenna ports, A plurality of antenna ports are divided into a predetermined number of groups based on the number of reference antenna ports, and the mapping of reference signals for channel state information measurement defined for the reference antenna ports differs depending on the subframe or resource block
  • Example of CSI-RS mapping for 8 antenna ports or less Example of table used to specify CSI-RS resource configuration
  • Example of table used to specify CSI-RS subframe configuration 1 is a schematic diagram of a wireless communication system according to an embodiment of the present invention.
  • Mapping example of CSI-RS The block diagram of the base station which concerns on the Example of this invention
  • the block diagram of the mobile station which concerns on the Example of this invention
  • Example of table used to specify CSI-RS resource configuration Mapping example of CSI-RS
  • a base station (eNB: evolved Node B) having a plurality of antenna ports, more specifically, a CSI-RS capable of supporting an extended number of antenna ports (number of antenna ports greater than 8).
  • eNB evolved Node B
  • CSI-RS capable of supporting an extended number of antenna ports (number of antenna ports greater than 8).
  • a base station for realizing the configuration will be described.
  • channel quality measurement is realized using a mobile station (UE: User Equipment) that communicates with a base station having a plurality of antenna ports, more specifically, CSI-RS that can handle an expanded number of antenna ports.
  • UE User Equipment
  • the CSI-RS is a reference signal used to measure channel state information (CSI) such as CQI (Channel Quality Indicator), PMI (Precoding Matrix Indicator), and RI (Rank Indicator).
  • An antenna port is a group of antenna elements that transmit reference signals. One antenna port may correspond to one antenna element, and one antenna port may correspond to a plurality of antenna elements.
  • (A) Capability to cope with various numbers of antenna ports For example, not only the number of antenna ports such as 16, 32, 64, etc., but also, for example, 10, 12, 16, 24, 32, 36, 48, 64, 96, 128 It is desirable to be able to cope with the number of antenna ports.
  • a CSI-RS configuration capable of supporting the expanded number of antenna ports is realized by any of the following methods.
  • the antenna port numbers 0 to 15 are divided into antenna port numbers 0 to 7 and antenna port numbers 8 to 15.
  • CSI-RS mappings for the extended number of antenna ports are generated. How a group of antenna ports is assigned to a subframe or resource block may be defined on the system.
  • the base station notifies the mobile station of information indicating the generated mapping. Further, the base station multiplexes CSI-RSs into resource blocks according to the generated mapping.
  • FIG. 4 is a schematic diagram of a radio communication system according to an embodiment of the present invention.
  • the wireless communication system includes a macro base station 10 that covers a wide area, an FD-MIMO station 20 that is located in or around the area of the macro base station 10 and has two-dimensionally arranged antenna elements, and a mobile station 30. . It is assumed that the FD-MIMO station 20 has more than eight antenna elements. The more than 8 antenna elements are classified into more than 8 antenna ports. As described above, one antenna element may correspond to one antenna port, and a plurality of antenna elements may correspond to one antenna port. In FIG.
  • the macro base station 10 and the FD-MIMO station 20 are arranged separately, but the macro base station 10 may be configured as an FD-MIMO station having more than eight antenna elements. Further, although the FD-MIMO station 20 is described as having two-dimensionally arranged antenna elements, the FD-MIMO station 20 may have one-dimensionally arranged or three-dimensionally arranged antenna elements.
  • the FD-MIMO station 20 generates CSI-RS mappings for the extended number of antenna ports, and transmits the CSI-RS mapping information to the mobile station 30 (S1). For example, the FD-MIMO station 20 may transmit the number of antenna ports and an index (CSI ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ reference signal configuration) indicating mapping of CSI-RS to the mobile station 30. An example of this mapping will be described below with reference to FIG. Further, the FD-MIMO station 20 multiplexes the CSI-RS to the resource element in the resource block according to the generated mapping, and transmits it to the mobile station 30 (S2). The mobile station 30 can extract the CSI-RS according to the CSI-RS mapping information. The mobile station 30 measures channel quality using CSI-RS, generates CSI, and transmits CSI to the FD-MIMO station 20 (S3).
  • S3 channel quality using CSI-RS
  • FIG. 5A shows an example of CSI-RS mapping when the number of antenna ports is 16.
  • the CSI-RS mapping is generated in the same manner as when the number of antenna ports is 8.
  • the CSI-RS of the antenna port number (0, 1) is continuously arranged in one subcarrier, and the antenna port number (4, 4) 5) CSI-RS is continuously arranged in the next subcarrier.
  • the CSI-RS of the antenna port number (2, 3) is continuously arranged in one subcarrier at the same symbol position as the CSI-RS of the antenna port number (0, 1), and the antenna port number (6, 6) is arranged. 7) CSI-RS is continuously arranged in the next subcarrier.
  • the arrangement of CSI-RSs with the antenna port numbers (0, 1, 4, 5) and numbers (2, 3, 6, 7) described above is the CSI with antenna port numbers 8 to 15. -Extend to RS.
  • the CSI-RS with the antenna port number (8, 9) is continuously arranged in the next symbol after the CSI-RS with the antenna port number (0, 1).
  • the CSI-RS with the antenna port number (10, 11) is continuously arranged on the subcarrier next to the CSI-RS with the antenna port number (8, 9).
  • the CSI-RS with the antenna port number (12, 13) is continuously arranged in the next symbol after the CSI-RS with the antenna port number (2, 3).
  • the CSI-RS with the antenna port number (14, 15) is continuously arranged on the subcarrier next to the CSI-RS with the antenna port number (12, 13).
  • mapping of CSI-RS when the number of antenna ports is 16 is not limited to that shown in FIG.
  • the CSI-RS may be arranged as shown in FIG. 5B in consideration of the above design philosophy (A) to (D), for example.
  • FIG. 5C shows an example of CSI-RS mapping when the number of antenna ports is 32.
  • the arrangement of the CSI-RS of the antenna port numbers (0, 1, 4, 5) and (2, 3, 6, 7) when the number of antenna ports is 8 is the antenna port.
  • the CSI-RS with numbers 8 to 31 is extended.
  • CSI-RSs with antenna port numbers 0 to 15 are arranged as in the case where the number of antenna ports is 16.
  • the CSI-RS of the antenna port number (16, 17) is continuously arranged on one subcarrier at the same symbol position as the CSI-RS of the antenna port number (0, 1), and the antenna port number (20, 21) CSI-RS is continuously arranged in the next subcarrier.
  • the CSI-RS with the antenna port number (24, 25) is continuously arranged in the next symbol after the CSI-RS with the antenna port number (16, 17).
  • the CSI-RS with the antenna port number (26, 27) is continuously arranged on the subcarrier next to the CSI-RS with the antenna port number (24, 25).
  • the CSI-RS of the antenna port number (18, 19) is continuously arranged on one subcarrier at the same symbol position as the CSI-RS of the antenna port number (0, 1), and the antenna port number (22 , 23) are continuously arranged on the next subcarrier. Further, the CSI-RS with the antenna port number (28, 29) is continuously arranged in the next symbol after the CSI-RS with the antenna port number (18, 19). The CSI-RS with the antenna port number (30, 31) is continuously arranged on the subcarrier next to the CSI-RS with the antenna port number (28, 29).
  • mapping of CSI-RS when the number of antenna ports is 32 is not limited to that shown in FIG.
  • the CSI-RS may be arranged in another resource element in consideration of the above design philosophy (A) to (D).
  • the CSI-RS is arranged in the resource element for PDSCH (Physical Downlink Shared Channel).
  • PDSCH Physical Downlink Shared Channel
  • the CSI-RS resources of antenna port numbers 0 to 7 shown in FIG. The CSI-RS may be mapped to use the element.
  • FIG. 5D shows an example of CSI-RS mapping when the number of antenna ports is 32.
  • the overhead of CSI-RS increases with the increase in the number of antenna ports.
  • the overhead of PUCCH Physical Uplink Control Channel
  • CRS Cell-specific Reference Signal
  • DM-RS Demodulation Reference Signal
  • CSI-RS Channel Reference Signal
  • the resource block including the CSI-RS has almost no area for transmitting the data signal. Therefore, the CSI-RS mapping is defined on the premise that the data signal is not transmitted in the resource block. Also good. For example, resource elements in which DM-RSs are arranged (DMRS (Rel-9 / 10) in FIG.
  • the CSI-RS may be arranged in a DM-RS for release 8 (DMRS (Rel-8) port # 5 in FIG. 1) or the like.
  • CSI-RS is multiplexed on resource elements by frequency multiplexing (FDM: Frequency Division Multiplexing) and time multiplexing (TDM: Time Division Division Multiplexing), but code division multiplexing (CDM: Code Division Division Multiplexing). And may be multiplexed in combination.
  • FDM Frequency Division Multiplexing
  • TDM Time Division Division Multiplexing
  • CDM Code Division Division Multiplexing
  • the CSI-RS of a certain antenna port may be code division multiplexed with the CSI-RS of another antenna port, and may be multiplexed on a resource element secured in the CSI-RS.
  • FIG. 6 shows a block diagram of the base station 20 according to the embodiment of the present invention.
  • the base station 20 includes a CSI-RS generation unit 201, a CSI-RS mapping information storage unit 203, a CSI-RS mapping information notification unit 205, a multiplexing unit 207, a transmission unit 209, a reception unit 211, and CSI processing. Part 213.
  • the CSI-RS generation unit 201 generates a reference signal (CSI-RS) for channel state information measurement.
  • CSI-RS reference signal
  • the CSI-RS mapping information storage unit 203 stores mapping information indicating to which resource element in the resource block the CSI-RS is multiplexed.
  • the CSI-RS mapping information storage unit 203 stores mapping information as shown in FIGS. 5A to 5D, for example.
  • the CSI-RS mapping information notification unit 205 notifies the mobile station of information indicating CSI-RS mapping. For example, when two types of mapping information in the case of 16 antenna ports as shown in FIG. 5A are defined on the system, the CSI-RS mapping information notification unit 205 includes information indicating the number of antenna ports, CSI -An index indicating RS mapping (CSI referenceRSsignal configuration) may be notified to the mobile station.
  • CSI-RS mapping information notification unit 205 includes information indicating the number of antenna ports, CSI -An index indicating RS mapping (CSI referenceRSsignal configuration) may be notified to the mobile station.
  • the multiplexing unit 207 multiplexes the CSI-RS to the resource elements in the resource block according to the mapping information stored in the CSI-RS mapping information storage unit 203. Data, control information, and the like are also encoded, rate-matched, modulated, and the like, and then multiplexed on resource elements in the resource block.
  • the resource element assigned to the PDSCH or the like is used for the CSI-RS by the CSI-RS of the extended antenna port.
  • a mobile station compliant with Release 12 of the 3GPP standard can recognize the newly defined CSI-RS mapping by signaling from the base station. Therefore, the multiplexing unit 207 can multiplex PDSCH while avoiding CSI-RS.
  • rate matching to data and control information corresponding to CSI-RS mapping in a rate matching unit (not shown) of the base station 20
  • a mobile station conforming to Releases 8 to 11 of the 3GPP standard cannot recognize the newly defined CSI-RS mapping. Therefore, the multiplexing unit 207 may apply puncturing.
  • the transmission unit 209 transmits a signal to the mobile station.
  • the transmission unit 209 transmits information indicating the mapping of CSI-RS to the mobile station, and transmits CSI-RS multiplexed with the resource element in the resource block together with data and control information to the mobile station.
  • the receiving unit 211 receives a signal from the mobile station.
  • the receiving unit 211 receives CSI from the mobile station.
  • the CSI processing unit 213 uses the received CSI and uses it for scheduling when transmitting data to the mobile station.
  • FIG. 7 shows a block diagram of the mobile station 30 according to the embodiment of the present invention.
  • the mobile station 30 includes a reception unit 301, a CSI-RS extraction unit 303, a CSI generation unit 305, and a transmission unit 307.
  • the receiving unit 301 receives the mapping information notified from the base station. In addition, the reception unit 301 receives CSI-RS, data, control information, and the like multiplexed on resource elements in the resource block.
  • the CSI-RS extraction unit 303 extracts the CSI-RS based on the mapping information notified from the base station.
  • CSI generation section 305 measures channel quality using the extracted CSI-RS, and generates CSI including CQI indicating channel quality, PMI indicating precoding matrix, and RI indicating the number of signal sequences.
  • the transmission unit 307 transmits the generated CSI to the base station.
  • the wireless communication system is configured in the same manner as in FIG.
  • the CSI-RS mapping for the extended number of antenna ports is generated by combining the CSI-RS mappings defined for a predetermined number or less of antenna ports shown in FIG.
  • the FD-MIMO station 20 may notify the mobile station 30 of 2 bits indicating the number of antenna ports and the indices 0, 1, 2, and 3 in the table of FIG. The indexes 0, 1, 2, and 3 may be notified individually as four indexes, or may be notified in a section (0, 3).
  • the relationship between the index to be notified and the antenna port may be explicitly notified to the mobile station 30 or may follow a predetermined rule.
  • an index of 0 in the table of FIG. 2 is assigned to antenna port numbers 0 to 7
  • an index of 1 is assigned to antenna port numbers 8 to 15
  • an index of 2 is assigned to antenna port numbers 16 to 23.
  • the mobile station 30 may be notified of information that the index is assigned to the antenna port numbers 24-31.
  • the base station 20 and the mobile station 30 set in advance rules for assigning antenna port numbers 0 to 7, 8 to 15, 16 to 23, and 24 to 31 in the order of indexes 0, 1, 2, and 3. Also good.
  • CSI-RS for 10 antenna ports when the number of antenna ports is 10, by combining the mapping of 2 antenna ports shown in FIG. 1A and the mapping of 8 antenna ports shown in FIG. 1C, CSI-RS for 10 antenna ports. Can be secured. In the case of 2 antenna ports, 20 types of CSI-RSs indicated by indexes 0 to 19 can be mapped. In the case of 8 antenna ports, 5 types of CSI-RSs indicated by indexes 0 to 5 are possible. RS mapping is possible. For example, by combining index 0 for 2 antenna ports and index 1 for 8 antenna ports, CSI-RS for 10 antenna ports can be secured. Therefore, the base station 20 moves 2 bits indicating the number of antenna ports of 2, 2 index indicating the number of antenna ports of 8 in the table of FIG. 2, and 1 index in the table of FIG. Just notify the station.
  • the CSI-RS mapping combinations for 1, 2, 4, and 8 antenna ports may be notified to the mobile station together with the CSI process (CSI Process) at the time of CSI calculation.
  • the CSI process is information indicating details of CSI feedback by a mobile station defined in Release 11 of the 3GPP standard. As shown in FIG. 8, the CSI process is defined by a combination of a signal power measurement resource (CSI-RS resource) used for CSI calculation and an interference signal measurement resource (CSI-IM (CSI-interference management) resource). Is done.
  • the signal power transmission resource is an index indicating the resource configuration for measuring the signal power in the own cell
  • the interference signal measurement resource is a signal in the other cell where there is no signal in the own cell. It is an index which shows the resource structure for electric power measurement.
  • one signal power measurement resource and one interference signal measurement resource can be designated for each CSI process.
  • the number of antenna ports expanded by specifying a plurality of signal power measurement resources (for example, # 1 and # 2) and a plurality of interference signal measurement resources (for example, # 1 and # 2) for each CSI process Minute CSI-RS mapping may be notified to the mobile station.
  • the base station 20 and the mobile station 30 are configured in the same manner as in FIGS. 6 and 7 except for the following points.
  • the CSI-RS mapping information storage unit 203 stores mapping information as shown in FIGS.
  • the CSI-RS mapping information notification unit 205 notifies the mobile station of information indicating CSI-RS mapping. For example, when combining four types of CSI-RS mappings indicated by indices 0 to 3 for 32 antenna ports, the CSI-RS mapping information notification unit 205 includes information indicating the number of 32 antenna ports, 0 to 3 indexes may be notified. For example, when combining CSI mapping indicated by an index of 0 for 2 antenna ports and CSI mapping indicated by an index of 1 for 8 antenna ports with respect to 10 antenna ports, a CSI-RS mapping information notification unit 205 may notify information indicating the number of antenna ports of 2, 8 and indexes of 0, 1. Further, the mapping information may be notified together with the CSI process.
  • the radio communication system is configured in the same manner as in FIG.
  • the antenna ports of the FD-MIMO station 20 are divided into a predetermined number of groups based on the number of reference antenna ports.
  • the CSI-RS mapping defined for the reference antenna port shown in FIG. 1 is used for CSI-RSs of different groups depending on subframes or resource blocks, so that CSI-RSs corresponding to the number of extended antenna ports are used.
  • FIG. 9A shows an example of CSI-RS mapping when the number of antenna ports is eight. As described with reference to FIG. 3, the CSI-RS is transmitted every 5, 10, 20, 40, or 80 milliseconds (subframe). FIG. 9A shows a case where CSI-RS is transmitted every 5 milliseconds.
  • CSI-RS for 32 antenna ports can be secured by transmitting CSI-RS mapping of 8 antenna ports alternately in 4 groups and transmitting in 4 subframes or 4 resource blocks. How a group of antenna ports is assigned to a subframe or resource block may be defined on the system. For example, as shown in FIG. 9B, the CSI-RS of 32 antenna ports has antenna port numbers 0 to 7 and antenna port numbers at transmission intervals (for example, 5 milliseconds) defined for 8 antenna ports.
  • the CSI-RS of 32 antenna ports has antenna port numbers 0 to 7 and antenna port numbers at transmission intervals (for example, 5 milliseconds) defined for 8 antenna ports.
  • the CSI-RS of 8 to 15, antenna port numbers 16 to 23, and antenna port numbers 24 to 31 may be transmitted by multiplexing in frequency units. For example, as shown in FIG.
  • CSI-RSs with antenna port numbers 0 to 7 are transmitted at a transmission interval defined for 8 antenna ports (for example, 5 milliseconds), and at the same transmission interval, The CSI-RSs with antenna port numbers 8 to 15, antenna port numbers 16 to 23, and antenna port numbers 24 to 31 may be transmitted in order.
  • the CSI-RSs of antenna port numbers 0 to 7, antenna port numbers 8 to 15, antenna port numbers 16 to 23, and antenna port numbers 24 to 31 are assigned to consecutive subframes. It may be assigned to subframes with a predetermined interval.
  • the CSI-RS is multiplexed on the resource block by frequency multiplexing (FDM) and time multiplexing (TDM), but may be multiplexed in combination with code division multiplexing (CDM).
  • FDM frequency multiplexing
  • TDM time multiplexing
  • CDM code division multiplexing
  • CSI-RS of a certain antenna port may be code division multiplexed with CSI-RS of another antenna port, and may be multiplexed on a resource block secured in CSI-RS.
  • the FD-MIMO station 20 may notify the mobile station 30 of the expansion factor in addition to the index (CSI-reference-signal-configuration) of the table (CSI-RS-configuration) shown in FIG.
  • the mobile station 30 can recognize that the CSI-RS mapping of the reference antenna port is used for different groups of antenna ports depending on the subframe or resource block.
  • the subframe configuration shown in FIG. For example, the first notified subframe is used for CSI-RS with antenna port numbers 0 to 7, and the second notified subframe is used for CSI-RS with antenna port numbers 8 to 15, Even if the subframe notified for the third time is used for the CSI-RS of the antenna port numbers 16 to 23 and the subframe notified for the fourth time is used for the CSI-RS of the antenna port numbers 24 to 31. Good.
  • the mobile station is notified of the subframe configuration shown in FIG. 3 for CSI-RS mapping of the reference antenna port, and the antenna port numbers 8 to 15 and the antenna port number 16 for the reference antenna port numbers 0 to 7 are sent.
  • the transmission timing (offset) of ⁇ 23 and antenna port numbers 24 ⁇ 31 may be notified to the mobile station.
  • the relationship between the antenna port and the subframe or resource block in which the CRI-RS of the antenna port is multiplexed may be explicitly notified to the mobile station, or may follow a predetermined rule.
  • CRI-RSs with antenna port numbers 0 to 7, 8 to 15, 16 to 23, and 24 to 31 may be assigned in the order of reserved subframes or resource blocks.
  • the base station 20 and the mobile station 30 are configured in the same manner as in FIGS. 6 and 7 except for the following points.
  • the CSI-RS mapping information storage unit 203 stores mapping information as shown in FIGS.
  • the CSI-RS mapping information notification unit 205 notifies the mobile station of information indicating CSI-RS mapping. For example, CSI-RS mapping when the number of reference antenna ports is 8 is used by alternately using four antenna port groups as shown in FIGS. 9B to 9D.
  • CSI-RS mapping information notification section 205 When transmitting in subframes or four resource blocks, CSI-RS mapping information notification section 205 notifies the mobile station of an index (CSI reference signal configuration) indicating the subframe configuration of the reference antenna port and an extension factor. May be. Further, the CSI-RS mapping information notification unit 205 may notify the mobile station of the index (CSI-RS-SubframeConfig) of the table (CSI-RS ⁇ subframe> configuration) shown in FIG.
  • the CSI-RS mapping information notification unit 205 includes an index (CSI-RS-SubframeConfig) indicating the subframe configuration of the reference antenna port and a transmission timing (offset) from the subframe configuration of the reference antenna port. May be notified to the mobile station.
  • index CSI-RS-SubframeConfig
  • offset transmission timing
  • the CSI-RS mapping specified in Release 10 of the 3GPP standard is switched in units of subframes or resource blocks.
  • the mapping in (1) or (2) is performed in subframes. Switching may be performed in units or resource blocks.
  • a resource block configuration for 16 antenna ports is generated according to the method of (1) or (2), and the generated CSI-RS mapping of 16 antenna ports is generated by two antenna ports. May be used alternately in groups and transmitted in two subframes or two resource blocks.
  • access port numbers in LTE are assigned numbers after 15 but in the above embodiment, serial numbers from 0 are assigned for convenience.
  • the amount of signaling to the mobile station can be reduced by combining the CSI-RS configurations in the case of 8 antenna ports or less.
  • the base station and the mobile station according to the embodiment of the present invention are described using functional block diagrams, but the base station and the mobile station according to the embodiment of the present invention may be hardware, software, or A combination thereof may be realized. In addition, the functional units may be used in combination as necessary. Further, although the method according to the embodiment of the present invention has been described using the flowchart showing the flow of processing, the method according to the embodiment of the present invention may be performed in an order different from the order shown in the embodiment. .

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KR102180227B1 (ko) 2020-08-07 2020-11-18 주식회사 아리스케일 전 차원 다중입력 다중출력 무선 통신 시스템에서 채널상태정보 참조신호 송수신 방법 및 장치
KR20200096896A (ko) * 2020-08-07 2020-08-14 주식회사 아리스케일 전 차원 다중입력 다중출력 무선 통신 시스템에서 채널상태정보 참조신호 송수신 방법 및 장치

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CN105580468B (zh) 2019-07-19
US10425852B2 (en) 2019-09-24
EP3051904B1 (en) 2021-05-05
US20180115919A1 (en) 2018-04-26
US10356644B2 (en) 2019-07-16
JP6114153B2 (ja) 2017-04-12
HK1226582A1 (en) 2017-09-29
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