WO2014071852A1 - Procédé, dispositif et système de mappage de signaux de référence basé sur un réseau d'antennes - Google Patents

Procédé, dispositif et système de mappage de signaux de référence basé sur un réseau d'antennes Download PDF

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Publication number
WO2014071852A1
WO2014071852A1 PCT/CN2013/086676 CN2013086676W WO2014071852A1 WO 2014071852 A1 WO2014071852 A1 WO 2014071852A1 CN 2013086676 W CN2013086676 W CN 2013086676W WO 2014071852 A1 WO2014071852 A1 WO 2014071852A1
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Prior art keywords
reference signal
transmitting node
sequence
transmitting
bid
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PCT/CN2013/086676
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English (en)
Chinese (zh)
Inventor
武雨春
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华为技术有限公司
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Publication of WO2014071852A1 publication Critical patent/WO2014071852A1/fr

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    • 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
    • H04B7/0617—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 for beam forming

Definitions

  • Multi-antenna technology is a key technology in wireless communication systems. It has been widely used in mainstream wireless communication systems in recent years, such as global interoperability for microwave access (WIMAX), long-term evolution (long Term evolution, LTE), wireless fidelity (WIFI).
  • WIMAX global interoperability for microwave access
  • LTE long-term evolution
  • WIFI wireless fidelity
  • a mutiple input multiple output (MIMO) technology is a uniform linear array (ULA) antenna arranged in one direction, such as two or four. And up to 8 antennas used on the transmitting node.
  • the access point (AP) used by the usual WIFI is up to 4 antennas, and the most common configuration is 1 or 2 antennas; and the ground transmitting nodes used in terrestrial cellular mobile communication systems, such as the LTE system.
  • the Rel-10 (version 10) version supports up to 8 antennas.
  • the prior art In order to solve the problem of the reference signal design method in a multi-antenna system, the prior art generally makes the number of reference signals used proportional to the number of antennas used or the maximum number of data streams that the system can transmit.
  • the number of downlink reference signals is proportional to the number of antennas.
  • CRS Cell Specific Reference Signal
  • 4-stream DM-RS Demodulation Reference Signal
  • CSI-RS Channel State Information Reference Signal
  • channel state information reference signal also occupies 2 OFDM in one subframe (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) symbol, also 14%. Therefore, if the number of antennas in the system is further increased, such as 32 or 64, according to the design method of the existing system, all resources of the entire system are used to transmit reference signals, and corresponding reference signals need to be in the upward direction.
  • Embodiments of the present invention provide a reference signal mapping method, apparatus, and system based on an antenna array, which can reduce waste of system resources by reference signal design and improve system compatibility.
  • a reference signal mapping method based on an antenna array is provided.
  • the transmitting node spatially forms a plurality of beams pointing in different directions, wherein each beam is generated by beamforming from all or part of the antenna ports on the antenna array, wherein the beam direction includes an elevation direction, an azimuth angle Direction or space in any direction;
  • the transmitting node configures a reference signal on each beam.
  • the first aspect specifically includes: overlapping the spatially adjacent beams in the differently directed beams or maintaining a low overlap region.
  • the first aspect or the first possible implementation manner specifically includes: the reference signal includes a cell-specific reference signal CRS, a positioning reference signal PRS, and a channel state information CSI reference signal CSI- RS.
  • the second possible implementation manner specifically includes: the transmitting node spatially forming a plurality of beams directed to different directions by the transmitting antenna array, including:
  • the transmitting node pre-codes the antenna port in a first direction or mechanically changes a pointing angle of the antenna port to generate a beam, and the transmitting node does not beamform the antenna port in a second direction, where the first The direction is orthogonal to the second direction, and the first direction includes an elevation direction, an azimuth direction, or an arbitrary direction of space, and the second direction includes an elevation direction, an azimuth direction, or an arbitrary direction of space.
  • the reference signal in combination with the first aspect or the first possible implementation manner, includes a user-specific demodulation reference signal DM-RS.
  • the transmitting node spatially forms, by the transmitting antenna array, a plurality of beams that point in different directions, including: the transmitting node is in the first direction and the second direction.
  • the first direction is orthogonal to the second direction, and the first direction includes an elevation direction, an azimuth direction, or an arbitrary direction of space.
  • the second direction includes an elevation direction, an azimuthal direction, or an arbitrary direction of space.
  • the method further includes: transmitting, by the transmitting node, a beam identifier BID corresponding to the reference signal to the user equipment UE of the beam service, so that the UE acquires a reference signal corresponding to the BID according to the beam identifier.
  • the transmitting, by the transmitting node, the beam identifier BID corresponding to the reference signal to the user equipment UE of the beam service includes:
  • the transmitting node sends the beam identifier BID corresponding to the reference signal to the user equipment UE of the beam service by using the downlink control information DCI or the radio resource control RRC signaling.
  • the transmitting node configuring the reference signal on each beam includes:
  • the transmitting node configures a reference signal having the same time-frequency position and a reference signal sequence on each beam;
  • the transmitting node configures reference signals having different time-frequency locations and/or reference signal sequences on each beam.
  • the transmitting node configuring, on each beam, a reference signal having a different reference signal sequence on each of the beams includes: a beam of the transmitting node for each beam Identifying a BID or a beam identification function corresponding to the beam identifier BID to generate a cell identifier CID of each beam;
  • the transmitting, by the transmitting node, configuring the reference signal having a different reference signal sequence on each of the beams includes: the transmitting node is associated with each beam according to the The cell identifier CID of the cell generates an initial sequence value;
  • the reference signals corresponding to the reference signal sequence are respectively configured on the each beam.
  • a reference signal mapping method based on an antenna array is provided.
  • the user equipment UE acquires a reference signal on the beam corresponding to the beam identifier according to the beam identifier;
  • the user equipment UE feeds back, by using an uplink channel, the signal quality of the beam identifier corresponding beam in the beam subset corresponding to the acquired reference signal to the transmitting node.
  • the signal quality includes a signal to interference and noise ratio SINR, a reference signal received power RSRP, a reference signal received quality RSRQ, a received signal strength indicator RSSI, and a channel quality indicator CQI. At least one item;
  • the beam parameters include:
  • the elevation angle indicates EI and the azimuth indicates AI.
  • the uplink channel includes: a physical uplink shared channel PUSCH or a physical uplink control channel PUCCH.
  • a transmitting node including:
  • a beamforming unit configured to spatially form a plurality of beams pointing in different directions, wherein each beam is generated by beamforming from all or part of antenna ports on the antenna array, wherein the beam direction includes an elevation angle Direction, azimuth direction or any direction of space;
  • a reference signal transmitting unit for configuring a reference signal on each beam.
  • the spatially adjacent beams in the differently directed beams are orthogonal to each other or remain low.
  • the third aspect or the first possible implementation manner specifically includes: the reference signal includes a cell-specific reference signal CRS, a positioning reference signal PRS, and a channel state information CSI reference signal CSI- RS.
  • the beamforming unit is specifically configured to:
  • the transmitting node does not beamform the antenna port in a second direction, where the first direction is The second direction is orthogonal, and the first direction includes an elevation direction, an azimuth direction, or an arbitrary direction of space, and the second direction includes an elevation direction, an azimuth direction, or an arbitrary direction of space.
  • the reference signal comprises a user-specific demodulation reference signal DM-RS.
  • the beamforming unit is specifically configured to: perform independent or joint precoding on the antenna port in a first direction and a second direction to generate a spatially a beam, wherein the first direction is orthogonal to the second direction, the first direction comprises an elevation direction, an azimuth direction or a spatial arbitrary direction, and the second direction comprises an elevation direction, an azimuth direction or a spatial arbitrary direction.
  • the transmitting node further includes a transmitting unit,
  • the beam identifier BID corresponding to the reference signal is sent to the user equipment UE of the beam service, so that the UE acquires the reference signal corresponding to the BID according to the beam identifier.
  • the transmitting unit is specifically configured to: send, by using downlink control information DCI or radio resource control RRC signaling, a beam identifier BID corresponding to the reference signal to User equipment UE served by the beam.
  • the reference signal transmitting unit is specifically configured to:
  • the reference signal transmitting unit includes:
  • a beam identification subunit configured to generate a cell identifier CID of each beam for a beam identification BID of each beam or a beam identification function corresponding to the beam identification BID;
  • a reference sequence generation subunit configured to respectively according to each The cell identifier CID of each beam generates an initial value of the sequence for each beam, and then generates a reference signal sequence according to the initial value of the sequence;
  • a beam configuration subunit configured to respectively configure reference signals corresponding to the reference signal sequence to each of the beams.
  • the reference signal transmitting unit includes:
  • An initial sequence generation subunit configured to generate a sequence initial value for each beam according to a cell identifier CID of the cell to which the cell belongs;
  • a reference sequence generating sub-unit configured to: configure, for the sequence initial value corresponding to each beam, an initial sequence value for indicating that a beam identification BID of each beam or a beam identification function corresponding to the beam identification BID is updated, Generating, according to the updated sequence initial value, a reference signal sequence of each beam;
  • a beam configuration subunit configured to respectively configure reference signals corresponding to the reference signal sequence to corresponding beams.
  • a UE including:
  • a reference signal receiving unit configured to acquire, according to the beam identifier, a reference signal on the beam corresponding to the beam identifier
  • a feedback unit configured to feed back, by the uplink channel, the signal quality of the beam corresponding to the beam in the beam subset corresponding to the acquired reference signal to the transmitting node.
  • the fourth aspect specifically includes the signal quality including a signal to interference and noise ratio SINR, a reference signal received power RSRP, a reference signal received quality RSRQ, a received signal strength indicator RSSI, and a channel quality indicator CQI.
  • the signal quality including a signal to interference and noise ratio SINR, a reference signal received power RSRP, a reference signal received quality RSRQ, a received signal strength indicator RSSI, and a channel quality indicator CQI.
  • the beam parameters include:
  • the elevation angle indicates EI and the azimuth indicates AI.
  • the uplink channel includes: a physical uplink shared channel PUSCH or a physical uplink control signal, in combination with the fourth aspect or the first possible implementation manner Road PUCCH.
  • a communication system comprising any of the foregoing transmitting nodes and any one of the foregoing UEs.
  • the antenna array-based reference signal mapping method, apparatus, and system provided by the embodiments of the present invention can form the same reference signal on the antenna port corresponding to the same beam by forming different antennas according to the corresponding antenna ports of the antenna array. Reduce the waste of system resources by reference signal design and improve system compatibility.
  • FIG. 1 is a schematic flowchart of a reference signal mapping method based on an antenna array according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of beam pointing of a reference signal mapping method based on an antenna array according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of beamforming of a reference array mapping method based on an antenna array according to an embodiment of the present invention
  • FIG. 4 is a schematic flowchart of a reference signal mapping method based on an antenna array according to another embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a transmitting node according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of another transmitting node according to an embodiment of the present invention
  • FIG. 7 is a schematic structural diagram of another transmitting node according to an embodiment of the present invention
  • FIG. 8 is a schematic diagram of a UE structure according to an embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of a transmitting node according to another embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of a UE according to another embodiment of the present invention.
  • FIG. 11 is a schematic diagram of a communication according to an embodiment of the present invention; System structure diagram.
  • the invention is mainly applied to the communication field supporting multi-antenna technology, for example, it can be applied to global interoperability for microwave access based on mutiple input multiple output (MIMO) technology.
  • MIMO mutiple input multiple output
  • WiMAX WiMAX
  • LTE long term evolution
  • WIFI wireless fidelity
  • the barrel is called ULA) antennas, such as 2, 4, and the most 8 antennas used on the transmitting node.
  • the transmitting node includes various transmitting stations, such as an eNB (evolved Node Base), a relay node, and an RRH (Remote Radio Head) unit that uses a fiber to be remoted.
  • eNB evolved Node Base
  • RRH Remote Radio Head
  • a transmitting node spatially forms a plurality of beams pointing in different directions, wherein each beam is generated by beamforming by all or part of antenna ports on the antenna array, wherein the beam direction includes an elevation direction, an azimuth direction, or Any direction of space;
  • the elevation direction and the azimuth direction are spatially two orthogonal directions.
  • one beam is simultaneously adjusted in the elevation angle and the azimuth direction, a beam pointing in any direction of the space can be obtained; in addition, one antenna port corresponds to at least An antenna array element on the antenna array.
  • spatially adjacent beams in the differently directed beams are orthogonal to each other or remain low.
  • the reference signal includes a cell-specific reference signal CRS, a positioning reference signal PRS, a channel state information CSI reference signal CSI-RS, and a demodulation reference signal DM-RS.
  • the step 101 is specifically that the transmitting node pre-codes the antenna port in the first direction or mechanically changes the pointing angle of the antenna port to generate a corresponding beam, and the transmitting node collides in the second direction.
  • the antenna port is not beamformed, wherein the first direction is orthogonal to the second direction, and the first direction includes an elevation direction, an azimuth direction, or an arbitrary direction of space, and the second direction includes Including the elevation direction, the azimuth direction, or any direction of space.
  • the array antenna a forms three beams a1, a2, and a3 in the elevation direction, and the three beams in the azimuth direction are all omnidirectional, and the three rings shown in FIG. 2 indicate the azimuth direction.
  • Omnidirectional the array antenna of the transmitting node of FIG.
  • the array antenna points to three different elevation angles in three-dimensional space by three beams pointing in different elevation angles formed in the elevation direction;
  • no precoding is performed, that is, it is directed in the horizontal direction to the range of all azimuths that can be covered (here, an omnidirectional antenna or a multi-sector directional antenna can be directly used, wherein the omnidirectional antenna is 360 degrees
  • the directional antenna is an antenna smaller than 360 degrees, such as 120 degrees).
  • the array antenna is used to point different angles to different users in one direction, and no precoding is performed in the other direction.
  • the antenna in the elevation direction orthogonal to the horizontal direction may also be a directional sector antenna having a certain direction (eg, an antenna of 120 degrees). Therefore, the reference signal of the CSI-RS based on this method is Another spatial characteristic of the antenna in the precoding direction that provides UE measurement and feedback at a particular angle.
  • the UE can feed back CSI at elevation and azimuth, or feedback CSI in azimuth and elevation directions, or the UE only feeds CSI in one direction to the same user as LTE Rel-12 (version 12).
  • step 101 is specifically: the transmitting node performs independent or joint precoding on the antenna port in the first direction and the second direction to generate a spatial beam, where the first direction is The second direction is orthogonal, and the first direction includes an elevation direction, an azimuth direction, or an arbitrary direction of space, and the second direction includes an elevation direction, an azimuth direction, or an arbitrary direction of space.
  • the direction of the antenna port can be changed by precoding to completely form all the antenna ports in the NxM antenna array through a three-dimensional pre-coded codebook W k to form different pointing angles or electronically controlled by precoding.
  • the mode changes the pointing angle of each antenna port, or changes the pointing angle of the antenna port by a conventional mechanical method; the reference signal of the antenna array of the antenna array is 8 X 4 (8 rows and 4 columns) is adopted by the transmitting node in a precoding manner.
  • the mapping is described as an example. For the convenience of the description in the embodiment of the present invention, the following description will be made by taking a narrow beam in the vertical direction as an example. Therefore, there are K beams pointing to different elevation angles in the vertical direction, and the kth beam in the vertical direction, which we call BAS k .
  • an antenna array of 8x4 is assumed assuming that each column of antennas is used to form an elevation direction.
  • the column formed a total of four columns. These four columns can form up to eight elevation patterns in the spatial direction after using three-dimensional precoding.
  • each of the four columns can be regarded as a horizontal antenna, and the 8x4 antenna array is equivalent to having four horizontal alignments.
  • the antenna therefore, according to the above method, for each beam in the elevation direction, the 8x4 antenna array can always be virtualized into a system with 4 antennas pointing to a specific elevation angle, which we call BAS k pointing to the kth elevation direction. (4).
  • each NxM antenna array can form a specific elevation direction through a three-dimensional pre-coded codebook Wk , and in this elevation direction, a maximum of M horizontal directions can be formed, so in this three-dimensional pre- Under the operation of the coding matrix, we can get BAS k (M) in each elevation direction. Therefore, for the 8x4 antenna array, we can get Table 1: Table 1: 8x4 antenna array multi-beam virtual antenna BAS k (4)
  • Each NxM array antenna can form a specific three-dimensional elevation direction by a precoding codebook W k, W k corresponding to each of a BAS k.
  • W k, W k corresponding to each of a BAS k.
  • Table 2 Codebook W corresponding to the kth beam of the 8x4 antenna array
  • Beamforming is first performed in the direction of the column, and then the precoding matrix is added in the direction of the row.
  • the resulting three-dimensional codebook generation method directed to an elevation beam k is represented by a matrix as follows:
  • M denotes the mth precoding matrix of the shared M stream, which is the mth precoding matrix) because there may be more than one precoding matrix in the horizontal direction, and m denotes all possible precoding from The mth out of the matrix is selected.
  • the method of generating the sum of the present invention will be given later.
  • the three-dimensional codebook generation method of the above formula (1) is expressed in a language: multiplying each element in each column in the precoding matrix vM ' in the column direction by a precoding column vector in the column direction as a column of three-dimensional precoding The columns in the matrix, that is, the three-dimensional precoding matrix.
  • the number of virtual antennas can be 1, 2, 3 or 4, up to 4.
  • the number of virtual antennas can be considered as the number of columns of the NxM antenna array, and can also be considered as the number of streams in the horizontal direction after pointing in the elevation direction. The following are all using the largest number M Show, ie: BAS k (M).
  • the transmitting node configures a reference signal on each beam.
  • the sub-array in the antenna array spatially forms a plurality of beams pointing in different directions through the above step 101, it is not necessary to design NxM reference signals for the NxM antenna array when designing the reference signal, and only need to follow the number of beams.
  • Design the reference signal for example, for the 8 x 4 antenna array to form four beams in the elevation direction, only on each BAS k (4), according to the equivalent system of up to 4 antennas, in each beam direction Design reference signals.
  • the step 102 specifically includes: the transmitting node configuring, on each beam, a reference signal having the same time-frequency position and a reference signal sequence;
  • the same reference signal (including the same reference signal sequence and the same reference signal) can be completely used. Template), used on different beams.
  • a plurality of narrow beam patterns can be formed in the elevation direction, and orthogonal or low interference between beams can be achieved by controlling positions where a plurality of narrow beams appear on the existing space.
  • the new reference signal design method is based on beam-specific reference signals, and the different beam directions point to users at different locations, so the beam-specific reference signals are also user-specific reference signals.
  • the advantages of this approach are: For NxM array antenna systems, the design of the reference signal for the antenna system of the M antennas can be used directly without any other changes.
  • the advantage of this method is obvious: when the transmitting node upgrades the transmitting antenna, the entire system specification does not need to be modified, and the user equipment UE does not need to make any modifications, but only needs to perform the baseband board of the transmitting node. The board can be upgraded, avoiding the high cost waste caused by replacing the transmitting node.
  • step 102 specifically includes: the transmitting node configuring a reference signal having a different time-frequency position and/or a reference signal sequence on each beam.
  • the time-frequency frame is determined by the time-frequency template used by the system.
  • the time-frequency template provided by the prior art can be directly used. Therefore, the present invention mainly defines whether the reference signals are the same from the perspective of the reference signal sequence;
  • the reference signal configured by the transmitting node to have different reference signal sequences on each beam includes:
  • the transmitting node generates a cell identifier CID of each beam for a beam identification function corresponding to a beam identification BID or a beam identification BID of each beam;
  • the cell identity CID of each beam is used to indicate the beam.
  • the transmitting node generates an initial sequence value for each beam according to the cell identifier CID of each beam, and then generates a reference signal sequence according to the initial value of the sequence.
  • the transmitting node configures the reference signals corresponding to the reference signal sequence to each of the beams.
  • the pseudo-random sequence used for the reference signal has a maximum length sequence, GMW (Gordon-Mills-Welch, Gordon-Myers-Wei The sequence, the Legendrere sequence and the gold Gold sequence, etc., here is an example of the Gold sequence.
  • GMW Gadon-Mills-Welch, Gordon-Myers-Wei
  • the God sequence is used, and the Gold sequence ⁇ 'J c(n) is generated as follows:
  • x 2 (n + 31) (x 2 (n + 3) + x 2 (n + 2) + x 2 (n + l) + x 2 (n)) mod2
  • N c 1600 is a system parameter
  • the initial value of the first sequence is all ones
  • the initial value of the second sequence is C init , which will be different for different RSs.
  • the M S R C S value is equal to 12 times the number of PRBs on the allocated PDSCH channel.
  • c Mt 2 10 (7(n s +1) + 1 + 1)(2 +1) + 2 + N cp
  • ⁇ is the number of the CID (cell identity) indicated for each UE
  • n s The time slot number is 0 and 1
  • N CP is CP type
  • the normal (normal) CP value is 1
  • the extended (extended) CP value is 0.
  • CID That is, a number of cells allocated for each different transmission point. Therefore, for CSI-RS, under the array antenna, it can be changed to N S , that is, the CID of the CSI-RS is generated for each beam.
  • the physical meaning is that, under each transmission point, different BIDs (beam identifiers) of the same site are used to indicate the CID generated by the CSI-RS, and the same BID can be a different beam allocation for each transmission point. Numbering. Thus different beams under each station can generate different CSI-RS reference signal sequences.
  • the transmitting node configures reference signals having different reference signal sequences on each beam, including:
  • the transmitting node generates a sequence initial value for each beam according to the cell identifier CID of the cell to which the cell belongs;
  • the transmitting node is configured to indicate an initial value of the sequence corresponding to the beam identification BID or the beam identification BID of each beam to obtain an updated sequence initial value, and then generate each according to the updated sequence initial value.
  • a reference signal sequence of the beam
  • the transmitting node respectively configures reference signals corresponding to the reference signal sequence to each of the beams.
  • the CP normal Central Processor
  • the extended CP extended central processor
  • CRS reference signals
  • PRS Physical channels Reference Signal
  • DM-RS DM-RS
  • the specific initial value of the DM-RS random sequence is generated as follows:
  • SCID ( /2" + 1)(2 ⁇ + 1)2 16 + ⁇ .
  • SCID is a scrambling code identifier, and the values are 0 and 1, respectively.
  • the specific value of the transmitting node is sent to the UE receiving the DM-RS reference signal through DCI (downlink control information) signaling, and X is CoMP.
  • the CID of the next cell can also be processed in a manner similar to CSI-RS, including interpreting X as the BID of a certain beam under a certain transmission point.
  • X is replaced as follows:
  • the transmitting node (herein the LTE system is taken as an example, the transmitting node is the eNB), the different reference signals are transmitted on different beams, so the user equipment UE on the receiving side receives the different reference signals on each beam.
  • the signal, and the UE can continuously feed back the feedback information required by the existing system, and also feed back the signal quality information of the beam subset measured on each beam. If there is a certain interference between the adjacent beams, the interference can be reduced by using different RSs, and the UE feeds back the signal quality information on different beams to facilitate the BS to perform beam allocation on the UE.
  • the method further includes:
  • the transmitting node sends the beam identifier BID corresponding to the reference signal to the user equipment UE of the beam service, so that the UE obtains the reference signal corresponding to the BID according to the beam identifier.
  • the transmitting node sends the beam identifier BID corresponding to the reference signal to the user equipment UE of the beam service by using the downlink control information DCI or the radio resource control RRC signal.
  • the BID may be indicated by the Downlink Control Information (DCI) of the system, such as the BID placed on the PDCCH (Physical Downlink Control Channel) or the enhanced PDCCH (ePDCCH).
  • DCI Downlink Control Information
  • ePDCCH enhanced PDCCH
  • the RRC (Radio Resource Control) signaling is used to indicate to the UE.
  • the UE communicates in the manner that the existing system has no BID before the BID is obtained, and after obtaining the BID indication value, the indicated BID performs the generation and demodulation of the reference signal. It is conceivable that a scheme of transmitting a specific function of the BID to the UE is also possible.
  • An embodiment of the present invention provides a reference signal mapping method based on an antenna array. Referring to FIG. 4, the method includes the following steps:
  • the user equipment acquires, by the beam identifier, a reference signal on a beam corresponding to the beam identifier.
  • the user equipment UE feeds back, by using an uplink channel, the signal quality and beam parameters of the beam identifier corresponding to the beam identifier in the beam subset corresponding to the obtained reference signal to the transmitting node.
  • the UE measures the signal quality from different beams on each beam.
  • the beam signal quality of a subset is then fed back to the transmitting node through the upstream channel.
  • Signal quality includes SINR (Signal to Interference plus Noise Ratio), RSRP (RS Received Power), RSRQ (RS Received Quality), RSSI (Received Signal Strength Indication)
  • the beam parameters include: one of EI (Elevation Indicator), AI (Azimuth Indicator), and the like. Kind or several.
  • the EI and AI are the elevation and azimuth angles of the eNB relative to the communication that the UE will measure itself.
  • the EI and AI values of the feedback can be the measured values and also the quantized bit values obtained from the measured results.
  • EI and AI can be quantized using uniform or non-uniform quantization methods. The following are two specific embodiments of EI and AI quantization.
  • mapping intervals can be used for quantization.
  • the present invention is not specifically limited.
  • the measurement of EI and AI can be performed by the method of measuring the DAP angle matured in the prior art, such as: MUSIC (Multi Signal Classification) algorithm, ESPRIT (Estimated signal parameters via rotational inVarianee technique,
  • the feedback channel includes feedback based on a PUSCH (Physical Uplink Shared Channel) channel, and includes feedback based on a PUCCH (Physical Uplink Control Channel).
  • PUSCH Physical Uplink Shared Channel
  • PUCCH Physical Uplink Control Channel
  • the antenna array-based reference signal mapping method provided by the embodiment of the present invention can reduce the reference signal design by forming the antenna array according to the corresponding antenna port to form different beams and configuring the same reference signal on the antenna port corresponding to the same beam. Waste system resources and improve system compatibility.
  • An embodiment of the present invention provides a transmitting node 5, as shown in FIG. 5, comprising: a beamforming unit 51 and a reference signal transmitting unit 52, wherein:
  • the beamforming unit 51 is configured to spatially form a plurality of beams pointing in different directions, wherein each beam is generated by beamforming from all or part of the antenna ports on the antenna array, wherein the beam direction includes an elevation direction and an orientation. Angular direction or space in any direction;
  • a reference signal transmitting unit 52 is configured to configure a reference signal on each beam.
  • the transmitting node provided by the embodiment of the present invention can reduce the waste of the reference signal design to the system resources by configuring the antenna array to form different beams according to the corresponding antenna ports and configuring the same reference signal on the antenna ports corresponding to the same beam. Improve system compatibility.
  • spatially adjacent beams in differently directed beams are orthogonal to each other or have low overlapping regions.
  • the reference signal includes a cell-specific reference signal CRS, a positioning reference signal PRS, and a channel state information CSI reference signal CSI-RS.
  • the beamforming unit 51 is specifically configured to:
  • the first direction includes an elevation direction, an azimuth direction, or an arbitrary direction of space
  • the second direction includes an elevation direction, an azimuth direction, or an arbitrary direction of space.
  • the reference signal includes a user-specific demodulation reference signal DM-RS.
  • the beamforming unit 51 is specifically configured to: perform independent or joint precoding on the antenna port in the first direction and the second direction to generate a spatial beam.
  • the first direction is orthogonal to the second direction
  • the first The direction includes an elevation direction, an azimuth direction, or an arbitrary direction of the space
  • the second direction includes an elevation direction, an azimuth direction, or an arbitrary direction of the space.
  • the transmitting node further includes a transmitting unit 53 for transmitting the beam identification BID corresponding to the reference signal to the user equipment UE of the beam service, so that the UE acquires the reference signal corresponding to the BID according to the beam identifier.
  • the transmitting unit 53 is specifically configured to: send, by using the downlink control information DCI or the wireless resource control RRC signaling, the beam identifier BID corresponding to the reference signal to the user equipment UE of the beam service.
  • the reference signal transmitting unit 52 is specifically configured to:
  • Reference signals having different time-frequency locations and/or reference signal sequences are configured on each beam.
  • the reference signal transmitting unit 52 includes: a beam identifying subunit 521a, configured to generate a cell identifier of each beam for a beam identification function corresponding to a beam identification BID or a beam identification BID of each beam. CID;
  • a reference sequence generation sub-unit 522a configured to generate a sequence initial value for each beam according to a cell identifier CID of each beam, and then generate a reference signal sequence according to the sequence initial value; a beam configuration sub-unit 523a, configured to correspond to the reference signal sequence
  • the reference signals are respectively configured to each beam.
  • the reference signal transmitting unit 52 includes: an initial sequence generating subunit 521b, configured to generate a sequence initial value for each beam according to a cell identifier CID of the cell to which the cell belongs;
  • the reference sequence generation sub-unit 522b is configured to configure, for each sequence initial value corresponding to each beam, an initial sequence value for indicating that the beam identification function corresponding to the beam identification BID or the beam identification BID of each beam is updated, and then according to the updated sequence.
  • the initial value generates a reference signal sequence for each beam;
  • the beam configuration subunit 523b is configured to respectively configure reference signals corresponding to the reference signal sequence to each of the beams.
  • the transmitting node provided by the embodiment of the present invention can reduce the waste of the reference signal design to the system resources by configuring the antenna array to form different beams according to the corresponding antenna ports and configuring the same reference signal on the antenna ports corresponding to the same beam. Improve system compatibility, In addition, by configuring the same or different reference signals on different beams, the UE can meet the requirements of the reference signal transmission in different scenarios, and improve system performance.
  • an embodiment of the present invention provides a user equipment UE6, including: a reference signal receiving unit 61 and a feedback unit 62, where
  • the reference signal receiving unit 61 is configured to acquire, according to the beam identifier, a reference signal on the beam corresponding to the beam identifier;
  • the feedback unit 62 is configured to feed back, by using the uplink channel, the signal quality of the beam identifier corresponding to the beam identifier in the beam subset corresponding to the acquired reference signal to the transmitting node.
  • the signal quality includes at least one of a SINR, a reference signal received power RSRP, a reference signal received quality RSRQ, a received signal strength indicator RSSI, and a channel quality indicator CQI;
  • the beam parameters include: an elevation indication EI and an azimuth indication AI.
  • the uplink channel includes: a physical uplink shared channel PUSCH or a physical uplink control channel PUCCH.
  • the UE provided by the embodiment of the present invention can receive the reference signal on different beams formed by the transmitting node configuration online array according to the antenna port, can reduce the waste of system resources caused by the reference signal design, improve system compatibility performance, and the UE passes the feedback pair.
  • the signal quality of the reference signal received in each beam is transmitted to the transmitting node, so that the transmitting node adjusts the reference signal transmission strategy, thereby improving system performance.
  • the transmitting node includes: at least one first processor 71, a first memory 72, a first communication interface 73, and a first bus 74, the at least one The first processor 71, the first memory 72, and the first communication interface 73 are connected by the first bus 74 and complete communication with each other.
  • the first bus 74 may be an Industry Standard Architecture (ISA) bus, a Peripheral Component (PCI) bus, or an Extended Industry Standard Architecture (Extended Industry Standard Architecture).
  • ISA Industry Standard Architecture
  • PCI Peripheral Component
  • EISA Extended Industry Standard Architecture
  • the first bus 74 can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 7, but it does not mean that there is only one bus or one type of bus. among them:
  • the first memory 72 is for storing executable program code, the program code including computer operating instructions.
  • the first memory 72 may include a high speed RAM memory and may also include a non-volatile memory such as at least one disk memory.
  • the first processor 71 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or configured to implement the embodiments of the present invention. One or more integrated circuits.
  • the first communication interface 73 is mainly used to implement communication between the device provided by the embodiment and other external devices.
  • the first processor 71 is configured to spatially form a plurality of beams pointing in different directions, wherein each beam is generated by beamforming by all or part of antenna ports on the antenna array, wherein the beam direction Includes elevation direction, azimuth direction, or any direction of space; configure a reference signal on each beam.
  • spatially adjacent beams in the differently directed beams are orthogonal to each other or remain low.
  • the reference signal includes a cell-specific reference signal CRS, a positioning reference signal PRS, and a channel state information CSI reference signal CSI-RS.
  • the first processor 71 is specifically configured to: perform the antenna port in a first direction. Precoding or mechanically changing a pointing angle of the antenna port to generate a corresponding beam, the transmitting node does not beamform the antenna port in a second direction, wherein the first direction is orthogonal to the second direction, and the first direction includes The elevation direction, the azimuth direction, or any direction of the space, and the second direction includes an elevation direction, an azimuth direction, or an arbitrary direction of space.
  • the reference signal further includes a user-specific demodulation reference signal DM-RS;
  • the first processor 71 is specifically configured to: perform independent or joint precoding on the antenna port in the first direction and the second direction to generate spatial a beam, wherein the first direction is orthogonal to the second direction, the first direction includes an elevation direction, an azimuth direction, or an arbitrary direction of space, and the second direction includes an elevation direction, an azimuth direction, or an arbitrary direction of space.
  • the first processor 71 is further configured to send the beam identifier BID corresponding to the reference signal to the user equipment UE of the beam service, so that the UE acquires the reference signal corresponding to the BID according to the beam identifier.
  • the first processor 71 is specifically configured to: send the beam identifier BID corresponding to the reference signal to the user equipment UE of the beam service by using downlink control information DCI or radio resource control RRC signaling.
  • the optional first processor 71 is specifically configured to: Configuring a reference signal having the same time-frequency position and a reference signal sequence on each beam;
  • Reference signals having different time-frequency locations and/or reference signal sequences are configured on each beam.
  • the first processor 71 is further configured to: generate, according to a beam identifier BID of each beam or a beam identifier function corresponding to the beam identifier BID, a different cell identifier CID of each beam; respectively, according to each beam
  • the cell identifier CID is an initial value of each beam generation sequence, and then a reference signal sequence is generated according to the sequence initial value; the reference signals corresponding to the reference signal sequence are respectively configured on each beam.
  • the first processor 71 is configured to: generate, for each beam, a sequence initial value according to a cell identifier CID of the cell to be used; and configure, for each beam, a sequence initial value, a beam identifier BID or a beam for indicating each beam.
  • the beam identification function corresponding to the BID obtains an updated sequence initial value, and then generates a reference signal sequence of each beam according to the updated sequence initial value; and the reference signals corresponding to the reference signal sequence are respectively configured to each beam.
  • the transmitting node provided by the embodiment of the present invention can reduce the waste of the reference signal design to the system resources by configuring the antenna array to form different beams according to the corresponding antenna ports and configuring the same reference signal on the antenna ports corresponding to the same beam. Improve system compatibility. In addition, by configuring the same or different reference signals on different beams, the UE can meet the requirements of the reference signal transmission in different scenarios and improve system performance.
  • the transmitting node includes: at least one second processor 81, a second memory 82, a second communication interface 83, and a second bus 84, the at least one The second processor 81, the second memory 82, and the second communication interface 83 are connected by the second bus 84 and complete communication with each other.
  • the second bus 84 may be an Industry Standard Architecture (ISA) bus, a Peripheral Component (PCI) bus, or an Extended Industry Standard Architecture (Extended Industry Standard Architecture).
  • ISA Industry Standard Architecture
  • PCI Peripheral Component
  • EISA Extended Industry Standard Architecture
  • the second bus 84 can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 8, but it does not mean that there is only one bus or one type of bus. among them:
  • the second memory 82 is for storing executable program code, the program code including computer operating instructions.
  • the second memory 82 may contain high speed RAM memory and may also include non- Non-volatile memory, such as at least one disk storage.
  • the second processor 81 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or configured to implement the embodiments of the present invention.
  • CPU central processing unit
  • ASIC application specific integrated circuit
  • the second communication interface 83 is mainly used to implement communication between the device provided by the embodiment and other external devices.
  • the second processor 81 is configured to obtain a reference signal on the beam corresponding to the beam identifier according to the beam identifier, and feed back, by using the uplink channel, the signal quality of the beam identifier corresponding to the beam identifier in the beam subset corresponding to the acquired reference signal.
  • the signal quality includes at least one of a SINR, a reference signal received power RSRP, a reference signal received quality RSRQ, a received signal strength indicator RSSI, and a channel quality indicator CQI;
  • the beam parameters include: an elevation indication EI and an azimuth indication AI.
  • the uplink channel includes: a physical uplink shared channel PUSCH or a physical uplink control channel PUCCH.
  • the UE provided by the embodiment of the present invention can receive the reference signal on different beams formed by the transmitting node configuration online array according to the antenna port, can reduce the waste of system resources caused by the reference signal design, improve system compatibility performance, and the UE passes the feedback pair.
  • the signal quality of the reference signal received in each beam is transmitted to the transmitting node, so that the transmitting node adjusts the reference signal transmission strategy, thereby improving system performance.
  • the embodiment of the present invention provides a communication system 9 including any of the transmitting nodes 91 and any user equipment UE92 provided by the foregoing embodiments.
  • the communication system provided by the embodiment of the present invention can reduce the waste of system resources by designing the reference signal by configuring the antenna array to form different beams according to the corresponding antenna ports and configuring the same reference signal on the antenna ports corresponding to the same beam. Improve system compatibility; In addition, by configuring the same or different reference signals on different beams, the UE can meet the requirements of the reference signal transmission in different scenarios and improve system performance.
  • the foregoing program may be stored in a computer readable storage medium, and the program is executed when executed.
  • the steps of the foregoing method embodiments are included; and the foregoing storage medium includes: various kinds of ROM, RAM, magnetic disk or optical disk.

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Abstract

La présente invention se rapporte au domaine des communications. L'invention concerne un procédé, un dispositif et un système de mappage de signaux de référence basé sur un réseau d'antennes permettant de réduire le gaspillage de ressources système provoqué par une conception de signal de référence et d'améliorer la compatibilité de système. Selon l'invention, le procédé fait appel : à la formation, dans l'espace, d'un réseau d'antennes de transmission en une pluralité de faisceaux par un nœud de transmission, lesquels pointent dans des directions différentes, chaque faisceau étant formé par une formation de faisceau, par tout ou partie des ports d'antennes du réseau d'antennes, et les directions de faisceaux comprenant une direction d'angle d'élévation, une direction d'angle d'azimut ou une direction arbitraire spatiale ; à la configuration d'un signal de référence sur chaque faisceau par le nœud de transmission. Un mode de réalisation de la présente invention peut être appliqué à un mappage de signaux de référence.
PCT/CN2013/086676 2012-11-07 2013-11-07 Procédé, dispositif et système de mappage de signaux de référence basé sur un réseau d'antennes WO2014071852A1 (fr)

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