WO2010067625A1 - Procédé de transmission de signal de référence de liaison descendante, poste de base, équipement utilisateur, et système de communication sans fil - Google Patents

Procédé de transmission de signal de référence de liaison descendante, poste de base, équipement utilisateur, et système de communication sans fil Download PDF

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Publication number
WO2010067625A1
WO2010067625A1 PCT/JP2009/006821 JP2009006821W WO2010067625A1 WO 2010067625 A1 WO2010067625 A1 WO 2010067625A1 JP 2009006821 W JP2009006821 W JP 2009006821W WO 2010067625 A1 WO2010067625 A1 WO 2010067625A1
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Prior art keywords
lte
reference signal
resource block
user equipment
advanced
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PCT/JP2009/006821
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English (en)
Japanese (ja)
Inventor
孫国林
劉仁茂
黄磊
丁銘
陳晨
張応余
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シャープ株式会社
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Publication of WO2010067625A1 publication Critical patent/WO2010067625A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
    • 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
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • 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
    • H04L5/0028—Variable division
    • 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 signaling, i.e. of overhead other than pilot signals
    • 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
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0092—Indication of how the channel is divided
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0204—Channel estimation of multiple channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H04L25/0228—Channel estimation using sounding signals with direct estimation from sounding signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/024—Channel estimation channel estimation algorithms
    • 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 radio transmission technique, and more particularly, realizes transmission of a downlink reference signal in an LTE-Advanced (Long Terminology Evolution-Advanced, hereinafter referred to as LTE-A) system, and provides an LTE (Long Terminology Evolution) system. And a method of transmitting a downlink reference signal in an orthogonal frequency division multiplexing (OFDM) wireless communication system that can be smoothly developed from an LTE system to an LTE-A system. .
  • LTE-A Long Terminology Evolution-Advanced
  • OFDM orthogonal frequency division multiplexing
  • Non-Patent Documents 1 and 2 In order to ensure backward compatibility of LTE-A system with LTE (Backward Compatibility), many companies continue to use LTE-A downlink reference signals (RS :) that are backward compatible with LTE system (Release 8). (Reference Non-Signal, or pilot signal, referred to as pilot) was submitted (see Non-Patent Documents 1 and 2).
  • LTE-A In LTE-A requirements, LTE system (Release 8) and LTE-A system can coexist in the same frequency spectrum, that is, LTE-A system is backward compatible with LTE user equipment (UE: User Equipment) It was pointed out that sex was necessary. For this reason, in the LTE-A system, transmission of downlink reference signals with backward compatibility has become a problem.
  • UE User Equipment
  • the present invention has been made in view of the above problems, and is simple and effective for transmission of a downlink reference signal in an LTE-A system, and is the maximum limit for a configuration corresponding to the LTE system (Release 8). And a transmission method that can be smoothly developed from an LTE system to an LTE-A system.
  • a downlink reference signal transmission method is a downlink reference signal transmission method applied to a radio communication system in which an LTE user apparatus and an LTE-Advanced user apparatus coexist.
  • a transmission method wherein a frequency bandwidth of a wireless communication system is divided into a plurality of basic frequency bandwidths, a basic bandwidth compatible with at least one LTE is defined, and an arrangement of the basic bandwidths is determined by a broadcast signal
  • the resource block of the radio communication system is changed into an LTE resource block and an LTE-Advanced resource block by the step of notifying the user equipment and a frequency division multiplexing method or a method combining frequency division multiplexing and resource reservation.
  • the LTE user apparatus and the LTE-Advanced user apparatus perform their own downlink channel measurement and user data demodulation according to the resource block type and subframe number. Preferably it is done.
  • the LTE-Advanced user equipment reads the reference signal, measures the downlink channel, demodulates the user data information, and demodulates the user data information according to the notified type of the resource block. It is preferable to perform downlink channel measurements.
  • the step including the step of allocating the resource block and the step of inserting the reference signal may include whether the scheduled user apparatus is an LTE user apparatus or an LTE-Advanced A step of determining whether it is a user apparatus, a step of assigning a resource block to the scheduled user apparatus, a reference signal is arranged according to the type of the user apparatus and the type of the allocated resource block, and the antenna arrangement and the operation mode
  • the method includes a step of changing.
  • LTE resource blocks are allocated to LTE user equipment, four antennas are used for user data transmission, and when LTE resource blocks are allocated to LTE-Advanced user equipment, eight antennas are used. Is preferably used for transmission of user data.
  • the demodulation reference signal of the user data is a 4-antenna common reference signal corresponding to the above four antennas, and the LTE resource block or the LTE-Advanced
  • the demodulated reference signal of user data is eight at the maximum.
  • the demodulated reference signal for user data is designed independently or other 4 antennas corresponding to the other four antennas not used in LTE user equipment. It is preferable to reuse the common antenna reference signal.
  • the design of the demodulation reference signal (DMRS: DataRSReference Signal) is described in more detail as follows.
  • the demodulation reference signal used for user data demodulation of the LTE-Advanced user apparatus determines the demodulation reference signal according to the rank change of the downlink channel matrix, thereby completing the demodulation of the data.
  • the demodulation reference signal may be realized by reusing the LTE-Advanced 8-antenna common reference signal and exchanging the position of the common reference signal of each of the antenna sets having four antennas. Further, the demodulation reference signal may be realized by reusing the LTE common reference signal and adding a 4-antenna demodulation reference signal. Furthermore, it is also possible to use an LTE individual reference signal as a demodulation reference signal.
  • the downlink reference signal transmission method it is possible to independently design the reference signal of the LTE-Advanced resource block divided by frequency division multiplexing without considering the compatibility problem of the LTE standard. As described above, it is possible to design the reference signal without considering the compatibility problem of the LTE standard.
  • the LTE-Advanced resource block when dividing into an LTE resource block and an LTE-Advanced resource block by a combination of frequency division multiplexing and resource reservation, is: It is preferable to divide the LTE-Advanced resource block and the LTE resource block from each other by a method that is distributed in the middle part of the LTE resource block or that combines the frequency division multiplexing method.
  • the LTE resource block and the reference signal defined in the LTE system have complete compatibility.
  • the LTE resource block preferably includes a 4-antenna common reference signal used for downlink channel measurement, and further includes 1st to 8th antenna demodulation reference signals used for user data demodulation.
  • the pilot used for data demodulation and the common pilot can be multiplexed with each other.
  • a base station is a base station applied to a radio communication system in which an LTE user apparatus and an LTE-Advanced user apparatus coexist, and the user station and the control apparatus A transmission / reception unit for communicating signals and user data; and dividing the wireless communication system bandwidth into a plurality of basic bandwidths to define a basic bandwidth compatible with at least one LTE;
  • the resource block of the wireless communication system is divided into an LTE resource block and an LTE-Advanced resource block, and the divided resource block is divided into an LTE user apparatus and an LTE- Resource allocation unit to be assigned to Advanced user equipment
  • a reference signal allocation unit that generates different reference signals including a common reference signal and a demodulated reference signal according to a resource block type and a user device type, and a basic bandwidth of each downlink from each user device
  • a resource scheduling and transmitter optimization unit that performs resource scheduling and transmitter optimization for LTE user equipment and LTE-Advanced user equipment by obtaining feedback information is
  • the resource block allocated to the LTE user apparatus by the resource allocation unit is an LTE resource block
  • the resource block allocated to the LTE-Advanced user apparatus by the resource allocation unit is the LTE resource block. It is preferably a resource block or an LTE-Advanced resource block.
  • the resource block allocated to the LTE-Advanced user apparatus is the entire system bandwidth at the maximum, and the resource block allocated to the LTE user apparatus is only a part of the entire system bandwidth. It is preferable.
  • an LTE-A user apparatus is an LTE-Advanced user apparatus applied to a radio communication system in which an LTE user apparatus and an LTE-Advanced user apparatus coexist.
  • Feedback information for detecting an existing downlink basic bandwidth and obtaining an uplink control signal that needs feedback in each basic bandwidth, and a transmission / reception unit that communicates control signals and user data with the base station In accordance with the content of the feedback information in each generation bandwidth and each basic bandwidth, the corresponding uplink control data format defined in the standard is adopted, the feedback information is mapped to the corresponding uplink resource block, and the base station Information feedback to feedback Characterized in that it comprises a Tsu bets.
  • the feedback information generation unit performs downlink channel measurement once every time of a plurality of subframes according to an operation mode in each basic bandwidth of the base station arrangement, and performs LTE system In this feedback method, it is preferable to feed back feedback information in each basic bandwidth to the base station.
  • a radio communication system includes the base station, the LTE-Advanced user equipment, and the LTE user equipment.
  • the base station determines whether the type of the scheduled user apparatus is an LTE user apparatus or an LTE-Advanced user apparatus.
  • the base station assigns a resource block (RB: Resource Block) to the user apparatus.
  • Reference signals are arranged according to the type of user equipment and the type of resource block.
  • the base station changes the antenna arrangement and the operation mode according to the type of the user equipment and the type of the resource block.
  • both the LTE resource block and the LTE-Advanced resource block are completely divided by the frequency division multiplexing method, in order to support channel measurement of the LTE-Advanced user equipment in the LTE resource block band, When mapping a common reference signal of an LTE resource block to a physical antenna, it is necessary to switch antennas.
  • a reference signal used for data demodulation is a 4-antenna common reference signal.
  • DMRS demodulation reference signal
  • An antenna common reference signal CRS: Common Reference Signal
  • the resource block type and the user apparatus are assigned to the user apparatus by higher layer signaling or physical downlink control channel (PDCCH: Physical Downlink Control).
  • the data regarding whether it is contained is alert
  • the LTE-Advanced user equipment reads reference signal information according to the broadcasted resource block type, calculates a channel quality indicator (CQI), and demodulates data information.
  • the LTE-Advanced user equipment reads a common pilot corresponding to four physical antennas from odd subframes and a common reference corresponding to the other four physical antennas from even subframes. Read the signal. Also, CQI measurement is performed once within two consecutive subframes.
  • an LTE-Advanced user apparatus performs channel measurement only within the reserved LTE-Advanced resource block.
  • the LTE-Advanced resource block may be static or frequency hopping, and the distribution density thereof can be arranged semi-statically.
  • An object of the present invention is to provide a downlink reference signal transmission method.
  • the base station uses the frequency division multiplexing method or the frequency division multiplexing and the resource reservation for the radio resources of the system, that is, the radio resources (hereinafter referred to as resource blocks) configured by the frequency and time allocated to the user data and control data. It is divided into an LTE resource block and an LTE-A resource block by a combined method.
  • LTE resource blocks can be allocated to LTE user equipment and LTE-A user equipment.
  • LTE-A resource blocks can be scheduled and allocated only to LTE-A user equipment. According to the resource block allocation method described above, the downlink channel state can be measured and fed back efficiently and easily.
  • LTE-A Can solve the reference signal transmission problem.
  • the user equipment uses the uplink control signal of the LTE system (Release 8), and the downlink of each basic bandwidth.
  • the channel state can be fed back, the downlink reference signal transmission problem in the LTE-A system can be solved well, and the LTE system can be smoothly developed to the LTE-A system.
  • the present invention has a small amount of signal information, high implementation flexibility, compatibility with the configuration of the LTE system (Release 8), and the user equipment of LTE-A in the next generation radio communication system.
  • the coexistence problem with the LTE user apparatus can be solved.
  • FIG. 1 is a schematic diagram showing an LTE-A system.
  • FIG. It is a block diagram which shows the structure of the base station of a LTE-A system. It is a block diagram which shows the structure of the user apparatus of a LTE-A system. It is a figure which shows an example for demonstrating the multiplexing and arrangement
  • FIG. 11 is a diagram illustrating another example for explaining multiplexing of data and measurement reference signals and arrangement modes of LTE resource blocks and LTE-A resource blocks.
  • 5 is a flowchart for explaining a reference signal transmission method of the LTE-A system.
  • FIG. 10 is a flowchart showing a reference signal arrangement process for LTE-A resource blocks and LTE resource blocks on the base station side.
  • FIG. 6 is a diagram illustrating a first example of a reference signal arrangement pattern when an LTE resource block is allocated to an LTE-A user apparatus by a base station.
  • FIG. 10 is a diagram illustrating a second example of a reference signal arrangement pattern when an LTE resource block is allocated to an LTE-A user apparatus by a base station. It is a figure which shows the reference signal identification at the time of allocating the LTE resource block to the LTE user apparatus by the base station. It is a figure which shows the data transmission of a MIMO odd frame at the time of allocating the LTE resource block to the LTE user apparatus by the base station. It is a figure which shows the data transmission of the MIMO even frame at the time of allocating the LTE resource block to the LTE user apparatus by the base station.
  • FIG. 3 is a diagram illustrating data transmission of a MIMO odd frame when an LTE resource block is allocated to an LTE-A user apparatus by a base station.
  • FIG. 6 is a diagram illustrating data transmission of a MIMO even frame when an LTE resource block is allocated to an LTE-A user apparatus by a base station.
  • 10 is a flowchart in a case where an LTE-A user apparatus performs CQI measurement according to a resource block type.
  • the base station and the eNodeB indicate the same communication entity
  • the user apparatus, the user terminal, and the UE all indicate the same communication entity.
  • FIG. 1 is a schematic diagram of an LTE-A system.
  • the user apparatus (UE) 102 includes at least two types of user apparatuses (UE) for LTE and user apparatuses (UE) for LTE-A.
  • the base station 101 is the center of system operation control, performs resource scheduling for the LTE user equipment and LTE-A user equipment in the cell, that is, resource allocation and data transmission, and downlink system bandwidth.
  • the total width is 100 MHz, and this 100 MHz is divided as one basic bandwidth every 20 MHz.
  • a plurality of randomly distributed LTE user apparatuses and a plurality of LTE-A user apparatuses coexist.
  • the downlink band of each user apparatus 102 is allocated by the base station 101 based on the service type, channel status and / or other factors (eg, apparatus type, UE category) of the user apparatus 102 of LTE-A .
  • the downlink band of each LTE user apparatus 102 is one basic band (20 MHz) in the entire system band (100 MHz).
  • the basic bandwidth may be an LTE carrier bandwidth, eg 1, 3, 5, 10, 15, 20 MHz.
  • the system bandwidth is the sum of several basic bandwidths (up to 100 MHz).
  • FIG. 2 is a block diagram showing a configuration of base station 101 according to the embodiment of the present invention.
  • the base station 101 includes a transmission / reception unit 1010, a resource allocation unit 1011, a reference signal arrangement unit 1012, and a resource scheduling and transmitter optimization unit 1013.
  • the transmission / reception unit 1010 is used to communicate control signals and user data with the user apparatus 102 in the cell.
  • the resource allocation unit 1011 divides the downlink system bandwidth into a plurality of basic bandwidths, of which a basic bandwidth compatible with LTE is divided into frequency division multiplexing (FDM) or FDM. And the physical downlink shared channel (PDSCH: Physical Downlink Shared Channel) resource block reservation, the LTE resource block and the LTE-A resource block are divided into LTE user equipment and LTE-A user. A corresponding downlink resource is allocated to the device.
  • FDM frequency division multiplexing
  • PDSCH Physical Downlink Shared Channel
  • the reference signal arrangement unit 1012 has an appropriate common reference signal (CRS: Common Reference) in a predetermined format according to the allocation of the LTE resource block and the LTE-A resource block depending on the type of resource block and the type of user equipment.
  • CRS Common Reference
  • Signal, a reference signal for downlink channel quality estimation), and a demodulation reference signal (DMRS: Data Demodulation Reference Signal, a reference signal for user data demodulation) are arranged.
  • Resource scheduling and transmitter optimization unit 1013 obtains feedback information from the user equipment regarding each basic bandwidth from each user equipment 102, assigns resource blocks to each user equipment and optimizes the transmitter. .
  • FIG. 3 is a block diagram showing a configuration of the user apparatus 102 according to the embodiment of the present invention.
  • the user apparatus 102 includes a transmission / reception unit 1020, a feedback information generation unit 1021, and an information feedback unit 1022.
  • the transmission / reception unit 1020 is used to communicate control signals and user data with the base station 101.
  • the feedback information generation unit 1021 detects each downlink basic bandwidth in which the control signal and user data exist, and provides feedback information of an uplink control signal that requires feedback to the base station 101 in each basic bandwidth. get.
  • the information feedback unit 1022 adopts the corresponding uplink control channel data format according to the content of the feedback information in each basic bandwidth, and feeds back to the corresponding uplink resource based on the sequence assigned by the higher layer The information is mapped and fed back to the base station 101 through the transmission / reception unit 1020.
  • FIGS. 2 and 3 show the configurations of the base station 101 and the user apparatus 102 to which the present invention can be applied in specific units, but the present invention is not limited to the configurations shown in this embodiment.
  • the present invention can be realized by, for example, integration, division, and combination of some or all units, and further by software, hardware, or a combination thereof.
  • Non-Patent Document 3 For the specific arrangement of the LTE system and the specific configuration of the uplink / downlink in the present embodiment, refer to Non-Patent Document 3. Also, refer to Non-Patent Document 4 for a specific mapping method in the physical resource block of the common reference signal of the LTE system.
  • the frequency division multiplexing FDM scheme can completely divide a system resource block into two frequency bands, an LTE resource block and an LTE-A resource block.
  • a method combining FDM division and resource block reservation can be used.
  • a partial frequency band of the downlink basic bandwidth is divided into LTE-A user apparatuses (FDM division), and partial resources are included in the frequency bands of the remaining LTE user apparatuses.
  • Blocks are reserved as resource blocks dedicated to LTE-A user equipment, and some of the resources for LTE user equipment can also be used as resource blocks for LTE-A user equipment.
  • all subframes start from 0 #, where “even subframes” are 0 #, 2 #, 4 #,..., 2n # (n ⁇ ⁇ 0, Z + ⁇ ).
  • the “odd subframe” is a subframe of 1 #, 3 #, 5 #,..., (2n + 1) # (n ⁇ ⁇ 0, Z + ⁇ ).
  • FIG. 5 is a flowchart for explaining a reference signal transmission method of the LTE-A system.
  • FIG. 6 is a diagram illustrating a first arrangement example when the base station 101 arranges a base band compatible with LTE in the LTE-A downlink.
  • FIG. 7 is a diagram illustrating a second arrangement example when the base station 101 arranges a base band compatible with LTE in the LTE-A downlink.
  • FIG. 8 is a flowchart showing a reference signal arrangement process for LTE-A resource blocks and LTE resource blocks on the base station 101 side.
  • FIG. 9 is a diagram illustrating a first example of a reference signal arrangement pattern when an LTE resource block is allocated to an LTE-A user apparatus by the base station 101, and FIG.
  • FIG. 11 is a diagram illustrating reference signal identification when an LTE resource block is allocated to an LTE user apparatus by a base station.
  • FIG. 12 is a diagram illustrating data transmission of an MIMO odd frame when an LTE resource block is allocated to an LTE user apparatus by a base station, and
  • FIG. 13 is a diagram illustrating an LTE resource block transmitted to an LTE user apparatus by the base station. It is a figure which shows the data transmission of the MIMO even frame at the time of allocation.
  • FIG. 11 is a diagram illustrating reference signal identification when an LTE resource block is allocated to an LTE user apparatus by a base station.
  • FIG. 12 is a diagram illustrating data transmission of an MIMO odd frame when an LTE resource block is allocated to an LTE user apparatus by a base station
  • FIG. 13 is a diagram illustrating an LTE resource block transmitted to an LTE user apparatus by the base station. It is a figure which shows the data transmission of the MIMO even frame at the time of allocation.
  • FIG. 14 is a diagram illustrating data transmission of a MIMO odd frame when an LTE resource block is allocated to an LTE-A user apparatus by the base station
  • FIG. 15 is a diagram illustrating LTE resource blocks allocated to the LTE-A by the base station. It is a figure which shows the data transmission of the MIMO even frame at the time of allocating to the user apparatus.
  • FIG. 16 is a flowchart when the LTE-A user apparatus performs CQI measurement according to the type of resource block.
  • the resource allocation unit 1011 of the base station 101 divides the system bandwidth into a plurality of basic bandwidths, and sets the basic bandwidth compatible with the LTE user equipment. At least one is defined and notified to each user apparatus 102 in the cell by system broadcast via the transmission / reception unit 1010.
  • the base station 101 divides resources of a basic bandwidth compatible with LTE into LTE resource blocks and LTE-A resource blocks.
  • the base station 101 may completely divide the resource block of the basic bandwidth compatible with LTE as shown in FIG. 4A by frequency, as shown in FIG. 4B, or FDM division of frequency division multiplexing. And resource block reservation.
  • the downlink system bandwidth is 100 MHz and includes five basic bandwidths. In these five basic bandwidths, all may be compatible with LTE, or only one of them may be compatible with LTE.
  • Example 1 As shown in FIG. 6, only one basic bandwidth in the downlink system bandwidth has compatibility with LTE user equipment.
  • the base station 101 notifies the user equipments 102 in the cell of the arrangement information by system broadcast via the transmission / reception unit 1010.
  • Example 2 As shown in FIG. 7, in the downlink system bandwidth, all basic bandwidths are compatible with LTE user equipment.
  • the base station 101 performs downlink band allocation. Refer to Non-Patent Document 4 for a specific definition of each basic band.
  • the base station 101 notifies the user equipments 102 in the cell of the arrangement information by system broadcast via the transmission / reception unit 1010.
  • the base station 101 divides a basic bandwidth resource block compatible with LTE into an LTE resource block and an LTE-A resource block.
  • the LTE-A system base station (eNodeB) 101 performs resource scheduling for the LTE user equipment and the LTE-A user equipment, that is, resource block allocation and common reference signal allocation. Two examples of performing are shown. That is, as shown in FIG. 4A, the data is completely divided by the FDM method, or as shown in FIG. 4B, it is divided using a method that combines FDM division and resource block reservation.
  • Example 1 As shown in FIG. 4A, when a basic bandwidth resource block is completely divided into two, an LTE resource block and an LTE-A resource block, by FDM, the LTE resource block divided by FDM is used.
  • the arrangement pattern design of the common reference signal in FIG. 2 adopts the arrangement of the common reference signal (LTE CRS) of the LTE system (Release 8), and the arrangement pattern design of the common reference signal in the resource block of LTE-A is The arrangement of the common reference signal (LTE-A CRS) of the LTE-A device corresponding to 8 antennas is used.
  • Each subframe includes an LTE resource block and an LTE-A resource block and occupies different frequency bands.
  • the LTE user apparatus occupies only the LTE resource block, but the LTE-A user apparatus can also occupy the LTE resource block in addition to the LTE-A resource block.
  • the downlink channel measurement in the LTE resource block band by the LTE-A user apparatus is supported by antenna switching.
  • the resource block of the basic bandwidth is divided by a method combining FDM division and resource block reservation.
  • the reserved resource block portion in the bandwidth of the LTE resource block is a dedicated resource block of the user equipment (UE) of LTE-A, that is, as shown in FIG. 4B, some of the dedicated LTE-A resource blocks are LTE.
  • UE user equipment
  • the common reference signal pattern of eight antennas is used for the arrangement pattern design of the common reference signal (LTE-A CRS) of the LTE-A resource block.
  • the base station (eNodeB) 101 allocates resource blocks to the LTE user apparatus and the LTE-A user apparatus, and inserts corresponding reference signals. Specifically, first, the resource allocation unit 1011 of the base station (eNodeB) 101 allocates resource blocks to the LTE user apparatus and the LTE-A user apparatus by a scheduling algorithm (step 5021). Then, the reference signal arrangement unit 1012 of the base station (eNodeB) 101 differs depending on the type of the allocated resource block (whether it is an LTE resource block or an LTE-A resource block). Is inserted into each resource block (step 5022).
  • FIG. 8 specifically illustrates the reference signal insertion step 5022.
  • the reference signal includes a common reference signal (LTE-CRS, LTE-A-CRS) and a demodulated reference signal (LTE-A-DMRS).
  • LTE-CRS common reference signal
  • LTE-A-CRS LTE-A-CRS
  • LTE-A-DMRS demodulated reference signal
  • the base station 101 is a user apparatus (UE) of which the type of the user apparatus (UE) 102 that is scheduled based on feedback information from the user apparatus (UE) 102, that is, to which a resource block is allocated, is LTE. Or the user apparatus (UE) of LTE-A is confirmed (step 801), and resource blocks are allocated to the user apparatus (UE) 102.
  • UE user apparatus
  • the base station 101 determines whether the resource block type is an LTE resource block (step 802).
  • the resource block type is an LTE-A resource block (“No” in step 802)
  • the base station 101 performs arrangement according to the reference signal format defined for the eight LTE-A antennas (step 802). 824).
  • the base station 101 determines whether the subframe number is odd or even. (Step 806). When the subframe number is an even number (“Yes” in step 806), the base station 101 determines that the common reference signal (LTE CRS) of # 1 to # 4 antennas and the demodulation reference signal (LTE-A) of eight antennas. DMRS) is inserted (step 808). When the subframe number is an odd number (“No” in Step 806), the base station 101 determines that the common reference signal (LTE CRS) for the # 5 to # 8 antennas and the demodulation reference signal for eight antennas (LTE-A DMRS). ) Is inserted (step 812). After that, the base station 101 maps the user data of the resource block to eight physical antennas and then transmits (step 810).
  • LTE CRS common reference signal
  • LTE-A demodulation reference signal
  • the base station 101 When the LTE resource block is allocated to the LTE user equipment (UE) (“Yes” in step 802, “No” in step 804), the base station 101 has an odd or even subframe number. (Step 814). When the subframe number is an even number (“Yes” in step 814), the base station 101 inserts the common reference signal (LTE CRS) of the four antennas of the LTE system (Release 8) (step 816), and # The antennas 1 to # 4 are switched, and downlink control data and LTE user data are transmitted (step 818).
  • LTE CRS common reference signal
  • the base station 101 similarly inserts the common reference signal (LTE CRS) of the four antennas of the LTE system (Release 8) (step 814). 820), # 5 to # 8 antennas are switched, and downlink control data and LTE user data are transmitted (step 822).
  • LTE CRS common reference signal
  • Example 1 As shown in FIGS. 12 and 13, for common reference signal (LTE CRS), antenna switching according to odd / even subframe numbers (for example, # 1-3-5-7 antenna and # 2-4) -6-8 antenna replacement).
  • the common reference signal (LTE-A CRS) of the LTE-A user apparatus is configured by switching the antenna.
  • the demodulation reference signal is a user equipment individual reference signal (Dedicated RS: Dedicated Signal)
  • a reference signal for example, a boom forming reference signal
  • eight antenna port5 reference signals in one resource block can be used as eight antenna demodulation reference signals (LTE-A DMRS).
  • a lot of time / frequency resources are occupied by a maximum of eight antenna demodulation reference signals.
  • the number of demodulation reference signals is determined according to the rank (Rank) of the channel matrix H. Can do. For example, when a reference signal of eight antennas port5 is used as a four-antenna demodulation reference signal (LTE-A CRS), downlink channel measurement accuracy can be improved. Considering the balance between resource occupation load and downlink channel measurement accuracy, such a method can be applied to the situation of MIMO transmission when the rank is small.
  • the insertion position of the demodulation reference signal (Dedicated RS), that is, the demodulation reference signal (LTE-A DMRS) of the LTE-A user apparatus can be fixed or frequency hopped.
  • Example 2 As shown in FIGS. 12 and 13, for common reference signal (LTE CRS), antenna switching according to odd / even subframe numbers (for example, # 1-3-5-7 antenna and # 2-4-4). 6-8 antenna replacement).
  • the common reference signal (LTE-A CRS) of the LTE-A user apparatus is configured by switching the antenna.
  • LTE-A DMRS demodulation reference signal
  • LTE-A DMRS demodulation reference signal
  • LTE CRS may be reused to switch between the common reference signal (LTE CRS) of the # 1 to # 4 antennas and the common reference signal (LTE CRS) of the # 5 to # 8 antennas at the time / frequency positions.
  • the demodulation reference signals (LTE-A DMRS) of the eight LTE-A user apparatuses are the four demodulation reference signals (# 1 to # 4 antennas)
  • LTE-AReDMRS the LTE system (Release 8) common reference signal (LTE CRS) is used, and for the four common reference signals (LTE CRS) of # 5 to # 8 antennas, # 2 in the resource block It can be arranged at an appropriate position in the # 3 and # 6 OFDM symbols. That is, for LTE-A user equipment, the common reference signal (LTE CRS) of the odd frame (for example, # 1 subframe in FIG.
  • LTE-A DMRS demodulation reference signal
  • LTE CRS common reference signal
  • LTE-A DMRS demodulation reference signal
  • LTE-A DMRS demodulation reference signal
  • Example 3 As shown in FIGS. 12 and 13, for common reference signal (LTE CRS), antenna switching according to odd / even subframe numbers (for example, # 1-3-5-7 antenna and # 2-4) -6-8 antenna replacement).
  • the common reference signal (LTE-A CRS) of the LTE-A user apparatus is configured by switching the antenna.
  • the LTE # 1 to # 4 antenna common reference signal is LTE- It can be used for downlink channel measurement of A user equipment and user data demodulation.
  • the demodulation reference signals (LTE-A-DMRS) of the remaining LTE-A # 5 to # 8 antennas can be designed independently.
  • the density of the reference signals can be increased appropriately.
  • such a method can be applied to the situation of MIMO transmission when the rank is high or the maximum rank.
  • the insertion position of the demodulation reference signal (LTE-A DMRS) of the LTE-A user apparatus can be fixed or frequency hopped.
  • LTE CRS common reference signal
  • a common reference signal (LTE-A CRS) of the LTE-A device is configured by switching the antenna.
  • the LTE # 1 to # 4 antenna common reference is the same as in Example 2.
  • the signal (LTE CRS) can be used for downlink channel measurement of LTE-A user equipment and user data demodulation.
  • LTE CRS LTE # 1 to # 4 antenna common reference signal
  • the demodulation reference signal (LTE-A DMRS) and user data of the LTE-A user apparatus are: There are always four transmit antennas.
  • the base station (eNodeB) 101 determines whether the resource block scheduled by the higher layer signaling is an LTE resource block or the LTE-A via the transmission / reception unit 1010.
  • the user equipment (UE) 102 is notified of whether it is a resource block.
  • LTE and LTE-A user equipments are defined according to the resource block type and subframe number and in their own standards, that is, in LTE system (Release 8) and LTE-A system.
  • LTE system Release 8
  • LTE-A system LTE-A system
  • the periodic downlink channel quality indicator (CQI) feedback method is based on the LTE system (Release 8). Further, the user apparatus refers to information such as CQI on each basic bandwidth based on the operation mode of each basic bandwidth arranged by the base station 101 and referring to the current LTE (Release 8) feedback mode. Calculate in order.
  • the LTE-A user equipment completes one CQI measurement every two consecutive subframes. Further, the user apparatus refers to information such as CQI on each basic bandwidth based on the operation mode of each basic bandwidth arranged by the base station 101 and referring to the current LTE (Release 8) feedback mode. Calculate in order.
  • FIG. 16 is a flowchart for explaining processing of the user apparatus of LTE-A that performs CQI measurement according to the type of resource block.
  • the LTE-A user apparatus first determines whether the received resource block is an LTE resource block by upper layer signaling or physical downlink control channel (PDCCH: Physical Downlink Control Channel) (step 1602). If the received resource block is an LTE-A resource block (“No” in step 1602), the 8-antenna reference signals (LTE-A CRS, LTE-A DMRS) defined in the LTE-A system described above Depending on the arrangement, downlink channel measurement and user data demodulation are performed (step 1612). If the received resource block is an LTE resource block (“Yes” in step 1602), it is determined whether the subframe number is even or odd (step 1604).
  • PDCCH Physical Downlink Control Channel
  • step 1604 If the subframe number is an even number (“Yes” in step 1604), the common reference signal (LTE CRS) of the # 1 to # 4 antennas is read, and the demodulation reference signal (LTE ⁇ ) according to the rank (Rank) is read.
  • the user data is demodulated by (A DMRS) (step 1606).
  • the subframe number is an odd number (“No” in step 1604), the common reference signal (LTE CRS) of the # 5 to # 8 antennas is read and the demodulation reference signal (LTE) corresponding to the rank (Rank) is read.
  • -A DMRS) is read and user data is demodulated (step 1610). Thereby, the calculation of CQI / PMI is completed once for every two consecutive subframes (step 1608).
  • an example of dividing by even / odd subframe numbers is given as an example, but it may be divided by intervals of a plurality of subframes according to a certain rule.
  • step 505 the information feedback unit 1022 of the user equipment (UE) 102 performs feedback information on each basic bandwidth, for example, CQI, PMI (Precoding Matrix Indicator) and / or RI (Rank). Indicator), according to the contents of information obtained by arbitrarily combining these three, and referring to the configuration of the LTE system (Release 8), feedback is performed using the corresponding uplink control data format.
  • Non-Patent Document 3 and Non-Patent Document 4 are referred to for details of the uplink control data format.
  • steps 501 to 505 may be performed once or by circulation (periodic or manual trigger). Thereby, normal operation of the base station 101 and all user apparatuses 102 can be ensured.
  • a downlink reference signal transmission method compatible with the LTE system (Release 8) is provided, and one or a plurality of LTE compatible signals are provided by the base station.
  • a basic bandwidth is defined, and the basic bandwidth is divided into an LTE resource block and an LTE-A resource block by a frequency division method, and is allocated to each user apparatus.
  • the allocated resource block is used for periodic CQI measurement.
  • the user apparatus grasps the basic bandwidth compatible with LTE through broadcast information (for example, broadcast channel), and information on the downlink channel state of each system bandwidth according to the resource block type and subframe number. Are detected and calculated in order.
  • the related configuration of the LTE system (Release 8) is basically used, so that the LTE system can be smoothly developed from the LTE-A system.
  • the present invention provides the next generation (B3G), fourth generation (4G) cellular mobile communication and digital television, wireless local area network (WLAN), self-organizing network (Mesh, Specific implementation methods can be provided for systems such as AdHoc, Sensor Network, Digital Home Network (e-Home), and Wireless Wide Area Network (WWAN).
  • B3G next generation
  • 4G fourth generation
  • WLAN wireless local area network
  • Mesh self-organizing network
  • AdHoc AdHoc
  • Sensor Network Sensor Network
  • e-Home Digital Home Network
  • WWAN Wireless Wide Area Network
  • the present invention can be particularly preferably used in a radio communication system in which an LTE user apparatus (UE) and an LTE-A user apparatus (UE) coexist.
  • UE LTE user apparatus
  • UE-A user apparatus UE

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  • Engineering & Computer Science (AREA)
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  • Computer Networks & Wireless Communication (AREA)
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Abstract

L'invention concerne un procédé permettant de transmettre des signaux de référence de liaison descendante, susceptible de résoudre le problème de coexistence d’équipement utilisateur LTE avancé et d’équipement utilisateur LTE standard dans un système de communication sans fil de prochaine génération. Le procédé comprend les phases consistant à : diviser une largeur de bande de système en une pluralité de largeurs de bande fondamentales, définir au moins une largeur de bande fondamentale compatible avec LTE et notifier, à l’aide d’un signal de diffusion, une configuration des largeurs de bande fondamentales à l’équipement utilisateur ; diviser un bloc de ressource système en un bloc de ressource LTE standard et un bloc de ressource LTE avancé par division FDM ou par combinaison de division FDM et de réservation de ressource ; affecter, sur la base d’un algorithme de planification, les ressources des blocs de ressource à l’équipement utilisateur LTE standard et à l’équipement utilisateur LTE avancé et injecter différents signaux de référence dans les blocs de ressource respectifs selon les types d’équipement utilisateur et les types de blocs de ressource alloués ; et transmettre les blocs de ressource programmés et notifier les types des blocs de ressource programmés à l'équipement utilisateur par le biais du canal de commande d'une liaison descendante physique ou d’une signalisation de couche supérieure.  La présente invention permet de résoudre le problème de coexistence d’équipement utilisateur LTE avancé et d’équipement utilisateur LTE standard dans un système de communication sans fil de prochaine génération en réduisant le volume d’informations de signalisation de commande, en augmentant la flexibilité des performances, et en garantissant la compatibilité avec la structure du système LTE (version 8). L'invention concerne également un poste de base, un équipement utilisateur et un système de communication sans fil.
PCT/JP2009/006821 2008-12-12 2009-12-11 Procédé de transmission de signal de référence de liaison descendante, poste de base, équipement utilisateur, et système de communication sans fil WO2010067625A1 (fr)

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