WO2018095122A1 - Procédé de communication sans fil et dispositif de communication sans fil - Google Patents

Procédé de communication sans fil et dispositif de communication sans fil Download PDF

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Publication number
WO2018095122A1
WO2018095122A1 PCT/CN2017/102406 CN2017102406W WO2018095122A1 WO 2018095122 A1 WO2018095122 A1 WO 2018095122A1 CN 2017102406 W CN2017102406 W CN 2017102406W WO 2018095122 A1 WO2018095122 A1 WO 2018095122A1
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channel
communication device
target communication
electronic device
preset
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PCT/CN2017/102406
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English (en)
Chinese (zh)
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曹建飞
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索尼公司
曹建飞
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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0417—Feedback systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/0478—Special codebook structures directed to feedback optimisation
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
    • 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
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • 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
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0868—Hybrid systems, i.e. switching and combining
    • H04B7/088—Hybrid systems, i.e. switching and combining using beam selection

Definitions

  • the present invention relates to a wireless communication method and a wireless communication device, and in particular to a method and apparatus for mixing channel state information feedback in a multi-antenna scenario.
  • Hybrid Channel State Information (Hybrid CSI) in the Rel.14 version.
  • the main purpose is to not only better support old users (legacy UEs) but also reduce the overhead of channel state information reference signals (CSI-RS) by performing beamforming or antenna port virtualization.
  • CSI-RS channel state information reference signals
  • the feedback mechanism for mixing channel state information can be roughly described as the following two phases.
  • the network side device including the eNB or the base station transmits a cell-specific CSI-RS including a beamformed CSI-RS (hereinafter referred to as beamforming CSI-RS) and Pre-coded CSI-RS for all ports.
  • the terminal device for example, the user equipment UE feeds back a CSI-RS indicator (CRI), or a partial precoding matrix indicator (partial PMI), or an analog beam pointing to the network side device by measuring the received CSI-RS.
  • CRI CSI-RS indicator
  • partial PMI partial precoding matrix indicator
  • the purpose of the first phase is to allow network-side devices to obtain long-term, coarse CSI for use in the second phase.
  • the network side device transmits the beamformed user-specific (UE-Specific) CSI-RS according to the coarse CSI obtained in the first phase, and then the terminal device measures the received CSI-RS, And feeding back CSI to the network side device, such as a feedback rank indicator (RI) or a precoding matrix indicator (PMI) or a channel quality indicator (CQI).
  • RI feedback rank indicator
  • PMI precoding matrix indicator
  • CQI channel quality indicator
  • Figure 1 shows the representation of the above mechanism in the time domain.
  • Two cycles of acquiring mixed channel state information are schematically illustrated in FIG. 1, each cycle including a first phase and a second phase.
  • the network side device transmits three cell-specific CSI-RSs, namely CSI-RS11, CSI-RS12 and CSI-RS13.
  • the network side device receives from the terminal device After the feedback (not shown in the figure), the network side device transmits the NZP CSI-RS21 and the NZP CSI-RS22 for the first terminal device and the second terminal device at different times in the second phase, respectively, which are user-specific CSI-RS.
  • the first and second terminal devices each generate CSI by measuring the received user-specific CSI-RS, and feed back the generated CSI to the network side device (not shown).
  • the operation of the network side device in the first phase is the same as the operation in the first phase of the first acquisition cycle, and then the NZP CSI for the third terminal device is transmitted in the second phase.
  • the third terminal device can determine the CSI by measuring the NZP CSI-RS 23 and feed it back to the network side device.
  • the mechanism In the feedback process of the mixed channel state information as described above, since the terminal device feeds back a rough channel state information in the first stage, the mechanism also has an inaccurate beam pointing problem. Specifically, it can be divided into the following three situations for discussion.
  • the network side device transmits a user-dedicated beamforming CSI-RS according to the CRI.
  • CRI resource indicator
  • the network side only supports 16 ports of CSI-RS. Assuming that there are 4 CSI-RS ports configured in the horizontal dimension, only 4 CSI-RS ports can be configured in the vertical dimension. In this case, the accuracy of the beam pointing in the vertical dimension is not very high, which results in the beam pointing to the terminal device often being inaccurate.
  • Figure 2 specifically shows this situation.
  • the dashed line in Fig. 2 shows the optimal beam pointing for the user equipments UE1 and UE2, however, as shown, none of the four beams used by the base station BS are directed to the user equipments UE1 and UE2.
  • the network side device uses the partial PMI to transmit the user-specific beamforming CSI-RS.
  • the beam pointing is not accurate enough.
  • the feedback overhead of the uplink increases due to the quantization burden of the analog beam.
  • the number of antennas is increasing and the beam direction is narrower and narrower, so it will face more serious problems and challenges.
  • the present invention proposes a feedback mixed channel state information in a multi-antenna scenario.
  • a solution that addresses one or more of the above issues.
  • an electronic device for wireless communication comprising processing circuitry configured to: perform a first channel measurement based on a first reference signal from a target communication device; The result of the first channel measurement determines a plurality of weight parameters, such that the composite channel obtained by weighting the preset plurality of channel features by using the plurality of weight parameters matches the actual channel, wherein the preset multiple Channel characteristics are known to the electronic device and the target communication device; and generating feedback information indicative of the plurality of weight parameters for the target communication device.
  • a method performed in a terminal device comprising: performing a first channel measurement according to a first reference signal transmitted by a target communication device; determining more based on a result of the first channel measurement a weighting parameter, such that the composite channel obtained by weighting the preset plurality of channel features by using the plurality of weight parameters matches the actual channel, wherein the preset plurality of channel characteristics are the terminal device and The target communication device is known; generating feedback information indicating the plurality of weight parameters to be sent to the target communication device; performing second channel measurement according to the second reference signal sent by the target communication device, where The second reference signal is transmitted by the target communication device via a composite channel obtained by weighted combining the preset plurality of channel characteristics based on the plurality of weight parameters; and based on the second channel measurement
  • the result is a channel measurement report generated for transmission to the target communication device.
  • an electronic device for wireless communication comprising processing circuitry configured to: generate a first reference signal to be transmitted to a target communication device; utilizing by the target The plurality of weight parameters indicated by the feedback information provided by the communication device are weighted and combined with the preset plurality of channel features to obtain a composite channel, wherein the plurality of weight parameters are used by the target communication device by using the Determining, by the reference signal, the first channel measurement, that the composite channel obtained by performing weighted combination of the preset plurality of channel features by using the plurality of weight parameters matches the actual channel, wherein the preset A plurality of channel features are known to the electronic device and the target communication device.
  • a method for performing in a network side device includes: transmitting a first reference signal to a target communication device; using a plurality of weight parameter pairs provided by the target communication device to preset Multiple channel characteristics are weighted and combined to obtain a composite channel, wherein the plurality of weight parameters are determined by the target communication device by performing first channel measurement by using the first reference signal, so that the plurality of The weighting parameter matches the preset combined channel features to obtain a composite channel that matches the actual channel, wherein The preset plurality of channel features are known by the network side device and the target communication device; transmitting a second reference signal to the target communication device via the composite channel; providing based on the target communication device Channel measurement report to configure a transmission channel, wherein the channel measurement report is obtained by the target communication device performing a second channel measurement by using the second reference signal.
  • Figure 1 schematically shows a time sequence diagram of a feedback mechanism for mixing channel state information.
  • Figure 2 shows schematically the inaccurate beam pointing.
  • Figure 3 illustrates a first conventional feedback mechanism for mixing channel state information.
  • FIG. 4 is a signal flow diagram showing a feedback scheme of mixed channel state information in accordance with a first embodiment of the present invention.
  • Figure 5 illustrates a second conventional feedback mechanism for mixing channel state information.
  • FIG. 6 shows a signal flow diagram of a feedback scheme for mixing channel state information in accordance with a second embodiment of the present invention.
  • Figure 7 shows a third conventional feedback mechanism for mixing channel state information.
  • FIG. 8 is a signal flow diagram showing a feedback scheme of mixed channel state information according to a third embodiment of the present invention.
  • Figure 9 schematically illustrates a radio frequency beamforming scheme.
  • Fig. 12 shows a schematic block diagram of a terminal device according to the present invention.
  • Figure 13 shows a schematic block diagram of a network side device in accordance with the present invention.
  • Fig. 14 shows a schematic configuration block diagram of a smartphone as one example of a terminal device.
  • FIG. 15 shows a schematic configuration block diagram of an eNB as one example of a network side device.
  • Figure 16 shows a block diagram of a schematic configuration of computer hardware.
  • a base station such as an eNB, has multiple antennas that support multiple input multiple output (MIMO) technology.
  • MIMO multiple input multiple output
  • the use of MIMO technology enables base stations to utilize spatial domain to support spatial multiplexing, beamforming, and transmit diversity. Spatial multiplexing can be used to simultaneously transmit different data streams on the same frequency. These data streams can be transmitted to a single User Equipment (UE) to increase the data rate (which can be classified as SU-MIMO technology) or to multiple UEs to increase the total system capacity (which can be classified as MU-MIMO technology). This is accomplished by spatially precoding each data stream (ie, applying scaling and phase adjustment of the amplitude) and then transmitting each spatially precoded stream on the downlink through multiple transmit antennas.
  • UE User Equipment
  • the spatially precoded data streams arrive at the UE(s) with different spatial signatures, which enables each of the UE(s) to recover one or more data streams destined for the UE.
  • each UE transmits a spatially precoded data stream, which enables the base station to identify the source of each spatially precoded data stream.
  • Beamforming can be used to concentrate the transmitted energy in one or more directions when channel conditions are less favorable. This can be achieved by spatially precoding the data for transmission over multiple antennas. In order to achieve good coverage at the cell edge, single stream beamforming transmissions can be used in conjunction with transmit diversity.
  • OFDM orthogonal frequency division multiplexing
  • MIMO multiple input multiple output
  • OFDM orthogonal frequency division multiplexing
  • OFDM is a spread spectrum technique that modulates data onto a number of subcarriers within an OFDM symbol. These subcarriers are separated by a precise frequency. This separation provides "orthogonality" that enables the receiver to recover data from these subcarriers.
  • a guard interval e.g., a cyclic prefix
  • the uplink may compensate for peak-to-average power ratio (PAPR) using SC-FDMA in the form of discrete Fourier transform (DFT) extended OFDM signals.
  • PAPR peak-to-average power ratio
  • DFT discrete Fourier transform
  • the radio protocol architecture for the user plane and the control plane in LTE is described next.
  • the radio protocol architecture for the UE and the eNB has three layers: Layer 1, Layer 2, and Layer 3.
  • Layer 1 (L1 layer) is the lowest layer and implements various physical layer signal processing functions.
  • the L1 layer will be referred to herein as the physical layer.
  • Layer 2 (L2 layer) is above the physical layer and is responsible for the link between the UE and the eNB above the physical layer.
  • the L2 layer includes a Medium Access Control (MAC) sublayer, a Radio Link Control (RLC) sublayer, and a Packet Data Convergence Protocol (PDCP) sublayer, which terminate at the eNB on the network side.
  • the UE may also have a number of upper layers above the L2 layer, including a network layer (eg, an IP layer) terminating at a public data network (PDN) gateway on the network side, and terminating at the other end of the connection (eg, far The application layer of the UE, server, etc.).
  • a network layer eg, an IP layer
  • PDN public data network gateway
  • the PDCP sublayer provides multiplexing between different radio bearers and logical channels.
  • the PDCP sublayer also provides header compression for upper layer data packets to reduce radio transmission overhead, provides security by ciphering data packets, and provides handover support for UEs between eNBs.
  • the RLC sublayer provides segmentation and reassembly of upper layer data packets, retransmission of lost data packets, and reordering of data packets to compensate for out-of-order reception due to hybrid automatic repeat request (HARQ).
  • HARQ hybrid automatic repeat request
  • the MAC sublayer provides multiplexing between logical channels and transport channels.
  • the MAC sublayer is also responsible for allocating various radio resources (e.g., resource blocks) in one cell among the UEs.
  • the MAC sublayer is also responsible for HARQ operations.
  • the radio protocol architecture for the UE and the eNB is substantially the same for the physical layer and the L2 layer, with the difference that there is no header compression function for the control plane.
  • the control plane also includes a Radio Resource Control (RRC) sublayer in Layer 3 (L3 layer).
  • RRC Radio Resource Control
  • L3 layer Layer 3
  • the RRC sublayer is responsible for obtaining radio resources (ie, radio bearers) and for configuring the lower layers using RRC signaling between the eNB and the UE.
  • L1 layer ie, physical layer
  • signal processing functions include encoding and interleaving to facilitate forward error correction (FEC) of the UE and based on various modulation schemes (eg, binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), M phase shifting. Keying (M-PSK), M Quadrature Amplitude Modulation (M-QAM) mapping to the signal constellation.
  • BPSK binary phase shift keying
  • QPSK quadrature phase shift keying
  • M-PSK M phase shifting. Keying
  • M-QAM M Quadrature Amplitude Modulation
  • Each stream is then mapped to an OFDM subcarrier, multiplexed with reference signals (eg, pilots) in the time and/or frequency domain, and then combined together using an Inverse Fast Fourier Transform (IFFT) to generate a carry
  • the physical channel of the time domain OFDM symbol stream is spatially precoded to produce a plurality of spatial streams.
  • Channel estimation can be used to determine coding and modulation schemes as well as for spatial processing.
  • the channel estimate can be derived from reference signals and/or channel condition feedback transmitted by the UE.
  • Each spatial stream is then provided to a different antenna via a separate transmitter. Each transmitter modulates the RF carrier with its own spatial stream for transmission.
  • each receiver receives signals through its respective respective antenna.
  • Each receiver recovers the information modulated onto the RF carrier and provides this information to the various signal processing functions of the L1 layer. Perform spatial processing on the information at the L1 layer to recover any destination destined for the UE Spatial flow. If there are multiple spatial streams destined for the UE, they can be combined into a single OFDM symbol stream.
  • the OFDM symbol stream is then converted from the time domain to the frequency domain using a Fast Fourier Transform (FFT).
  • FFT Fast Fourier Transform
  • the frequency domain signal includes a separate OFDM symbol stream for each subcarrier of the OFDM signal.
  • the symbols on each subcarrier, as well as the reference signal are recovered and demodulated by determining the signal constellation points most likely to be transmitted by the eNB. These soft decisions can be based on channel estimates. These soft decisions are then decoded and deinterleaved to recover the data and control signals originally transmitted by the eNB on the physical channel. These data and control signals are then provided to higher layer processing
  • Full-dimensional MIMO (FD-MIMO) technology can greatly improve system capacity by using a two-dimensional antenna array with, for example, up to 64 antenna ports at the eNB.
  • the benefits of using multiple antenna ports at the eNB may include small inter-cell interference and high beamforming gain.
  • the use of a two-dimensional antenna array allows for UE-specific beamforming in both the horizontal and vertical directions.
  • the number of transmit antennas at an eNB can be increased by, for example, 8 to 10 times compared to a conventional 8-antenna MIMO system. These additional transmit antennas provide greater beamforming gain and less interference to neighbor cells.
  • UE-specific beamforming can be performed only in the horizontal direction.
  • the shared vertical downtilt can be applied to multiple UEs.
  • UE-specific beamforming can be performed in both the horizontal direction and the vertical direction.
  • the eNB requires MIMO channel state information (CSI) for the full channel.
  • CSI channel state information
  • conventional beamforming/precoding methods rely on the availability of CSI for the entire transmit dimension (eg, instantaneous/statistical knowledge of the channel from each eNB transmit antenna to one or more UE receive antennas).
  • Such CSI is obtained either by the UE's Precoding Matrix Indicator (PMI) / Rank Indicator (RI) report, or by utilizing channel reciprocity.
  • PMI Precoding Matrix Indicator
  • RI Rank Indicator
  • CSI is primarily obtained at the eNB by utilizing bidirectional channel reciprocity.
  • FDD Frequency Division Duplex
  • CSI is typically measured and quantized at the UE and then fed back to the eNB via a dedicated uplink channel.
  • the size of the codebook used for CSI quantization increases as the number of transmit antennas at the eNB increases.
  • the PMI/RI report of the UE may be based on pilot-assisted estimation of the downlink full channel.
  • the pilot (or shared reference signal) overhead and downlink channel estimation complexity may be proportional to the number of eNB antennas. Therefore, the complexity of PMI/RI selection may increase as the number of eNB antennas increases.
  • the downlink reference signal is a predefined signal occupying a specific resource element (RE) in a downlink time-frequency resource block (RB).
  • RE resource element
  • RB downlink time-frequency resource block
  • Cell-specific reference signal Generally refers to a common reference signal that can be used by all UEs in a cell.
  • DMRS Demodulation Reference Signal
  • CSI-RS Channel State Information Reference Signal
  • CSI Channel state information
  • the channel state information is used to indicate the channel state of the channel between the base station and the UE.
  • the channel state information may include a rank indicator (RI), a precoding matrix indicator (PMI), and a channel quality indicator (CQI).
  • the RI is information about the channel rank, which indicates the maximum number of layers that can carry different information in the same time-frequency resource.
  • the PMI is used to indicate an index of a specific precoding matrix in a codebook including a plurality of precoding matrices shared between a base station and a UE.
  • the CQI indicates the channel quality and can be used to help determine the corresponding modulation scheme and coding rate.
  • a CSI-RS indicator (CRI) is used to indicate a preferred CSI-RS resource, and the UE measures each CSI-RS resource and feeds back the recommended beam in the form of a CRI.
  • FIG. 3 shows a first conventional feedback mechanism for mixing channel state information.
  • the network side device (hereinafter referred to as "base station") configures K beams for transmitting cell-specific beamforming CSI-RS.
  • the cell-specific beamforming CSI-RS is, for example, a CSI-RS supported by a Class B eMIMO type (CLASS B eMIMO-Type) in the current version of the LTE-A communication standard, where each CSI-RS antenna port There are respective CSI-RS resources and a narrower beamwidth without covering the entire cell range, and at least some of the beams have different beam directions.
  • CLASS B eMIMO-Type Class B eMIMO type
  • the K beams may correspond to 4 beams in the vertical dimension, expressed as It should be noted that the beam configured by the base station is not limited to the vertical dimension, and may also be a horizontal dimension, for example, it may be expressed as Alternatively, the beam may not be limited to vertical and horizontal dimensions, for example, may be represented as a more general form
  • the base station transmits a cell-dedicated beamforming CSI-RS to a terminal device (hereinafter simply referred to as "user equipment") via the configured four beams in step S310.
  • the user equipment measures the received power (reference signal received power, RSRP) of the CSI-RS signal, and according to the measurement result, one beam with the strongest RSRP is fed back to the base station by CRI, as shown in step S320.
  • CRI can indicate each beam with a different combination of 2 bits, for example, the first beam Corresponding to the bit combination "00", and so on, the fourth beam Corresponds to the bit combination "11".
  • the base station sends the user-specific beamforming CSI-RS to the user equipment by using the preferred beam indicated by the CRI in step S330.
  • the user equipment feeds back the CSI to the base station in step S340.
  • Such CSI may include, for example, RI/PMI/CQI.
  • the base station configures the downlink channel according to the CSI fed back by the user equipment in step S350, thereby transmitting the beamformed data to the user equipment via the Physical Downlink Shared Channel (PDSCH).
  • PDSCH Physical Downlink Shared Channel
  • the user equipment feeds back a response signal of the HARQ process, ie an acknowledgement (ACK) or a negative acknowledgement (NACK), in step S360.
  • ACK acknowledgement
  • NACK negative acknowledgement
  • the conventional feedback mechanism shown in FIG. 3 often has the following problem: as described above in connection with FIG. 2, since the number of configurable beams of the base station is small (the value of K is small), the CRI of the user equipment feedback indicates The beam is often not the beam most suitable for the user equipment, that is, the feedback beam often cannot be pointed to the user equipment accurately, which causes the base station to fail to use the ideal beam to transmit the user-specific CSI-RS in the second stage. .
  • the present invention proposes a first embodiment which can improve the accuracy of the beamforming CSI-RS of the second stage.
  • 4 is a signal flow diagram showing a feedback scheme of mixed channel state information in accordance with a first embodiment of the present invention.
  • the base station configures, for example, four preset vertical dimension beams in step S401.
  • the base station can use higher layer signaling, for example, radio resource control (RRC) signaling, the information about the configuration of the beam P v notifies the user equipment.
  • RRC radio resource control
  • the base station may semi-statically configure a cell-specific conventional beamforming CSI-RS, and put information about the reconfigured cell-specific regular beamforming CSI-RS into RRC signaling to notify the user after reconfiguration occurs. device.
  • the base station transmits a cell-specific non-precoded/non-beamformed CSI-RS to the user equipment in step S403, for example, in the current version of the LTE-A communication standard.
  • CSI-RS supported by Class A eMIMO-Type in which different CSI-RS antenna ports have the same CSI-RS resources, wide beamwidth and direction to cover the entire cell range.
  • the user equipment measures the received CSI-RS and calculates a set of weight parameters Cv , as shown in step S404.
  • the set of weight parameters can be expressed as It is used to linearly weight combine the four vertical dimension beams.
  • the combined beam obtained after weighted combination can be expressed as
  • the user equipment can calculate the weight parameter Cv using a plurality of methods, one of which is to maximize the received power RSRP of the CSI-RS, which can be expressed by the following mathematical formula (1):
  • column vector h represents the overall vertical dimension channel
  • the user equipment has learned information on the beam P v configured by the base station.
  • the user equipment can be estimated, for example, from the conventional unprecoded/unbeamformed CSI-RS received at step S403.
  • the user equipment obtains a set of weight parameters C v that maximizes the RSRP of the cell-specific beamforming CSI-RS by the less complex search according to the above mathematical formula (1).
  • the user equipment feeds back the calculated weight parameter C v corresponding to each preset vertical dimension CSI-RS beam to the base station in step S405.
  • the elements in Cv may be designed to be selected from a smaller parameter codebook.
  • the parameter codebook can be a real digital book. Its element is 1/2 Nth power.
  • each weight parameter can be represented by only 2 bits (such as "00", "01", “10", "11"), and since there are 4 weight parameters, the total number of bits used for feedback is 8.
  • a plurality of rotary codebook e.g. ⁇ e j ⁇ / 2, e j2 ⁇ / 2, e j3 ⁇ / 2, e j4 ⁇ / 2 ⁇ , where each element corresponds to the The angle obtained after the unit circle is equally divided in the complex plane.
  • the vector contains four elements, and therefore respectively correspond to the four quarters after the unit circle obtained The angles, that is, 0 degrees, 90 degrees, 180 degrees, and 270 degrees, respectively.
  • each element corresponds to each angle obtained by octave the unit circle. It should be noted that, in this paper, four vertical dimension beams and corresponding four weight parameters are taken as an example, but the number of beams and weight parameters is not limited thereto.
  • the base station obtains the weight parameter fed back by the user equipment, and performs linear weight combining on the four vertical dimension beams using the group weight parameter in step S406 to obtain a composite beam, where the direction of the composite beam corresponds to enabling the user equipment to receive the CSI-RS. Power RSRP maximum direction.
  • the base station then transmits the user-specific CSI-RS to the user equipment using the composite beam in step S407.
  • the user equipment measures the CSI-RS in step S408, obtains channel state information (for example, RI/PMI/CQI) according to a conventional manner, and feeds back the channel state information to the base station in step S409, and then the base station according to the user in step S410
  • the channel state information fed back by the device configures the downlink channel to transmit beamformed data.
  • Steps S409-S411 in FIG. 4 are respectively the same as the corresponding steps in FIG. 3, and therefore will not be described again.
  • the multiple weight parameters are fed back compared to the case where the user simply selects a certain beam for feedback.
  • the scheme capable of obtaining a more accurate composite beam by weighted combination can improve the accuracy of the base station transmitting the user-specific CSI-RS in the second phase, and accordingly the user equipment can also provide more accurate channel state information feedback in the second phase.
  • the signaling overhead of the embodiment of the present invention is significantly reduced compared to the direct feedback of the accurate overall channel h. small. In this way, a reasonable compromise between implementation complexity and signaling overhead is achieved.
  • FIG. 5 shows a second conventional feedback mechanism for mixing channel state information, which differs from FIG. 3 in steps S510-S530. Therefore, steps S510-S530 will be mainly described below, and descriptions of steps S540-S560 which are the same as steps S340-S360 in FIG. 3 are omitted.
  • the base station transmits a non-precoded (full port) CSI-RS in step S510.
  • the user equipment measures all ports and calculates a partial PMI (indicating precoding matrix W1), which is long-term broadband information, representing a spatially wider beam.
  • the user equipment then feeds back the calculated partial PMI (indicating the precoding matrix W1) to the base station in step S520.
  • the base station transmits the user-specific CSI-RS to the user equipment using the beam indicated by the partial PMI, so that the user equipment performs the second-stage measurement, as shown in step S530.
  • the present invention proposes a second embodiment which can improve the accuracy of the beamforming CSI-RS of the second stage.
  • 6 shows a signal flow diagram of a feedback scheme for mixing channel state information in accordance with a second embodiment of the present invention.
  • the base station transmits the CSI-RS of the all-port that is not precoded to the user equipment in step S601.
  • the user equipment measures all ports and calculates a partial PMI (indicating the precoding matrix W1).
  • W1 is represented by the broadband and long-term PMI groups in the two-stage PMI mechanism of the LTE system.
  • the user equipment calculates and feeds back information about the plurality of precoding matrices W1 according to the all-port CSI-RS transmitted by the base station.
  • the plurality of preset W1s and their corresponding PMIs are configured by the base station to the user equipment through high layer signaling, or are pre-defined by the communication protocol and pre-stored in the communication chip, so as to be known to the base station and the user equipment.
  • the weight parameter may be calculated by a method of maximizing the received power RSRP of the CSI-RS, as shown in the following mathematical formula (2):
  • the user equipment obtains a set of weight parameters C v that maximizes the RSRP of the CSI-RS received in step S601, and returns the weight parameter C v in step S603. To the base station.
  • the user equipment determines the corresponding weight parameter for each W1. Therefore, the elements in the weight parameter C v can be fed back in the same order as the multiple W1s in the codebook. Accordingly, the base station can determine the weight parameter corresponding to each W1 according to the knowledge about the codebook of W1, and perform subsequent encoder synthesis. Alternatively, in another example, the user equipment may determine a corresponding weight parameter only for a portion of the W1 codebook that is closest to the actual beam direction (eg, n(n ⁇ M)) W1, in which case, In step S603, the user equipment also feeds back the used n W1s to the base station through the partial PMI.
  • the base station performs linear weighted combination using the received weight parameter C v and the determined plurality of W1s in step S604, thereby obtaining a composite W1, ie Then, the base station transmits the user-dedicated CSI-RS to the user equipment by using the beam corresponding to the composite W1, as shown in step S605. Subsequent steps S606-S609 are the same as the corresponding steps in the first embodiment shown in FIG. 4, and therefore will not be described again.
  • FIG. 7 shows a third conventional feedback mechanism for mixing channel state information, which is similar to the second conventional feedback mechanism shown in FIG. 5, with the main difference being step S720. That is, after the base station transmits the un-coded all-port CSI-RS to the user equipment in the first phase, the user equipment measures all ports and calculates the simulated (precise) beam direction instead of calculating the partial PMI. Then, the user equipment quantizes the calculated beam direction and feeds back to the base station (as shown in step S720) instead of the feedback part PMI.
  • the problem with the feedback mechanism is that the quantization loss is either large when the beam direction is quantized, or the precise beam direction causes the signaling overhead to be too large to be fed back to the base station via the uplink channel.
  • FIG. 8 is a signal flow diagram showing a feedback scheme of mixed channel state information according to a third embodiment of the present invention.
  • the base station first sets a set of base vectors through high layer signaling such as RRC in step S801.
  • the user equipment is notified such that the set of base vectors is known to the base station and the user equipment.
  • the base station transmits the non-precoded all-port CSI-RS to the user equipment in step S802.
  • the user equipment measures all ports in step S803 and calculates a precise optimal beam direction. For example, the user equipment can determine the channel matrix after measuring all ports.
  • the user equipment may perform eigenvalue decomposition on the determined channel matrix to obtain a feature vector, and use the feature vector as an optimal beam direction. It should be noted that those skilled in the art can easily obtain the optimal beam direction by using any other known manner. The invention is not limited to the above examples.
  • the user equipment can use a linear combination of the set of basis vectors To represent (simulate) the calculated optimal beam direction
  • the user equipment needs to determine the weighting parameter Cv for the weighted combination.
  • the user equipment can determine the set of weight parameters Cv by satisfying the maximum correlation and the transmit power constraints, as shown in the following mathematical formula (3):
  • the user equipment can be obtained by the search algorithm according to the above mathematical formula (3). with The correlation is maximized and simultaneously satisfies a set of weight parameters C v of the transmit power constraint, and then the user equipment feeds back the calculated weight parameter C v to the base station, as shown in step S804.
  • the base station uses the received weight parameter C v to the previously known multiple base vectors in step S805. Perform weighted combination to obtain the combined beam direction It can be considered Indicates the closest to the optimal beam direction Beam direction. Therefore, the base station can utilize The corresponding beam transmits the user-specific CSI-RS to the user equipment, as shown in step S806. Subsequent steps S807-S810 are the same as the corresponding steps in the first embodiment shown in FIG. 4, and therefore will not be described again.
  • FIG. 9 schematically illustrates the radio frequency beamforming scheme.
  • the digital precoder 910 precodes the input K data streams, and the precoded data is transmitted to the analog precoder 920 via the K radio frequency chains, and the analog precoder 920 Includes multiple phase shifters and adders.
  • the signal is sent to the user equipment via the M antenna units.
  • signals from the base station are received via N antenna units, and the received signals are then output through a plurality of phase shifters to an RF chain.
  • Different codebooks can form beams that are pointed by different spaces.
  • a base station may use multiple beams to transmit a reference signal in different time periods, which may be called Beam Sweeping, in order to allow a user equipment to measure multiple beams to determine which beam is most suitable for the user equipment, and then The number of the most suitable beam is fed back to the base station.
  • the present invention proposes a fourth embodiment for the radio frequency beamforming scheme.
  • the pointing accuracy of the beam is not very high.
  • the user equipment may attempt to obtain a beam more suitable for itself by linearly weighting the K beams.
  • a linear combination can be expressed as In it, C k is the weight parameter, k ⁇ [1,..., K].
  • the user equipment determines whether there is a better beam direction than the existing K beams by determining the reference signal received power RSRP on the composite beam under different linear combinations, that is, making the received power RSRP larger beam direction, As shown in the following formula (4):
  • the meaning of the parameter h is the same as the meaning in the mathematical formula (1), k ⁇ [1, ..., K].
  • the user equipment feeds back the weight parameter C k corresponding to the weighted combination to the base station.
  • the base station uses the weight parameter C k to obtain a beam direction that is more precisely directed to the user equipment, and to transmit the user-specific CSI-RS using the obtained beam direction.
  • the user equipment feeds back one beam with the strongest signal receiving power among the K beams to the base station.
  • FIG. 10 shows a signaling flow in time in the case where the beam direction is not specified in advance in the communication protocol
  • FIG. 11 shows a signaling flow in the case where the beam direction has been previously specified in the communication protocol.
  • the base station needs to notify the user equipment of the configured beam direction by using RRC signaling before transmitting the cell-specific CSI-RS, as shown in step S1010.
  • both the base station and the user equipment know the coordinate system that the optimal beam direction can be projected, so the user equipment only needs to feed back the projection parameters of the optimal beam direction in the coordinate system (ie, as described above).
  • the weight parameter ") the base station can recover the optimal beam direction according to the projection parameters.
  • the base station may transmit a cell-specific CSI-RS to the user equipment in step S1020.
  • the weight parameter is calculated by the above method, and the weight parameter is fed back to the base station in step S1030.
  • the base station performs a linear weighted combination using the received weight parameters to obtain an optimal beam direction that more accurately points to the user equipment, and transmits the user-specific CSI-RS using the optimal beam, as shown in step S1040.
  • the user equipment After measuring the CSI-RS received in step S1040, the user equipment generates CSI in a conventional manner and reports it to the base station in step S1050.
  • step S1010 is omitted, and the process starts directly with step S1020.
  • the beam direction configured by RRC signaling is a longer-term configuration, that is, by one configuration, the configured beam direction can be used in multiple feedback periods, so it is not necessary to perform step S1010 in each feedback period.
  • the cell-specific CSI-RS transmitted by the base station in step S1020 is also a long-term configuration
  • the user-specific CSI-RS transmitted in step S1040 is a short-term configuration.
  • long-term configuration can be configured by high-layer signaling, such as RRC signaling, and the period is, for example, about 100 ms or longer.
  • the short-term configuration can be configured by a physical layer control channel such as downlink control information (DCI), and the period is configured.
  • DCI downlink control information
  • the shortest can be, for example, 1 ms.
  • the signaling flow shown in FIG. 11 is basically the same as the flow of FIG. 10 except that the initial step S1010 is omitted. This is because in the case where the beam direction has been specified in the communication protocol, it is not necessary to configure the beam by the base station via RRC signaling. Steps S1120-S1150 in Fig. 11 are the same as steps S1020-S1050 in Fig. 10, respectively.
  • 12 and 13 respectively show schematic block diagrams of a terminal device and a network side device according to the present invention.
  • the terminal device 1200 includes a processing unit 1210, a storage unit 1220, and a transceiver unit 1230.
  • the transceiver unit 1230 includes one or more antennas for transmitting and receiving signals with the network side device.
  • the storage unit 1220 is configured to store a codebook. As described above, the terminal device 1200 may design the weight parameter as an element in the codebook when determining the weight parameter, so that each weight parameter may be indicated by a small number of bits. This reduces the feedback overhead.
  • the storage unit 1220 also stores channel characteristics that are common to the network side device and the terminal device, and the well-known channel characteristics are represented in the first embodiment as a plurality of CSI-RSs configured by the base station for transmitting cell-specific CSI-RSs.
  • the beam which is represented in the second embodiment as a plurality of partial PMIs (W1) calculated and fed back by the terminal device, appears as a preset set of base vectors in the third embodiment, and is represented as a base station in the fourth embodiment. Send multiple beams of the reference signal.
  • the processing unit 1210 further includes a measurement unit 1211, a weight parameter determination unit 1212, and a CSI determination unit 1213.
  • the measuring unit 1211 is configured to perform measurement on reference signals transmitted by the network side device, such as a cell-specific CSI-RS and a user-specific CSI-RS.
  • the weight parameter determining unit 1212 calculates a weight parameter for linearly weighting the well-known channel characteristics based on the measurement result of the cell-specific CSI-RS by the measuring unit 1211, and refers to the weighting parameter for the well-known channel feature.
  • the codebook stored in the storage unit 1220 generates feedback information including an index of the codeword corresponding to each weight parameter (as described above) Said "00", "01", etc.).
  • the CSI determining unit 1213 generates CSI (for example, including RI/PMI/CQI) according to a measurement result of the user-specific CSI-RS by the measuring unit 1211, and transmits the CSI to the network side device via the transceiving unit 1230.
  • CSI for example, including RI/PMI/CQI
  • the network side device 1300 includes a processing unit 1310, a storage unit 1320, a codebook update unit 1330, and a transceiver unit 1340.
  • the transceiver unit 1340 includes a plurality of antennas for transmitting and receiving signals with the terminal device.
  • the storage unit 1320 stores the same codebook as the codebook in the terminal device, so that the weight parameter can be obtained based on the received feedback information and the codebook. Further, similarly to the storage unit 1220 in the terminal device, the storage unit 1320 also stores channel characteristics that are well known by the network side device and the terminal device.
  • the codebook updating unit 1330 is configured to update the stored codebook, that is, the network side device 1300 semi-statically configures the codebook. Further, the codebook updating unit 1330 also generates an instruction regarding the updated codebook to notify the terminal device of the update of the codebook via the transceiving unit 1340.
  • the processing unit 1310 includes a reference signal generating unit 1311, a combined beam determining unit 1312, and a channel configuring unit 1313.
  • the reference signal generating unit 1311 is configured to generate channel state information reference information (CSI-RS), such as a cell-specific CSI-RS and a user-dedicated CSI-RS, for transmission to the terminal device via the transceiver unit 1340.
  • CSI-RS channel state information reference information
  • the composite beam determining unit 1312 obtains a weight parameter by referring to the codebook stored in the storage unit 1320 according to the feedback information from the terminal device, and uses the weight parameter to linearly weight combine the well-known channel features to obtain a pointing to the terminal device. A more precise synthetic beam.
  • the transceiver unit 1340 transmits the user-specific CSI-RS to the terminal device by using the composite beam determined by the combined beam determining unit 1312, so that the terminal device generates the CSI by measurement.
  • the channel configuration unit 1313 configures the downlink transport channel in accordance with a conventional method based on the CSI fed back by the terminal device.
  • the present invention provides a more accurate solution for obtaining mixed channel state information.
  • the terminal device does not simply feed back a certain beam direction configured by the network side device in the first phase, but feeds back a weighted combination of multiple channel features that are well known to the terminal device and the network side device.
  • the weighting parameter is such that the network side device uses the weighting parameter to perform weighted combination of the plurality of channel features to match the actual channel, so that the reference signal can be transmitted in a more precise manner in the second phase.
  • “matching” means that the resulting composite channel direction corresponds to the actual channel direction that is most suitable for the terminal device (i.e., the channel direction that most accurately points to the terminal device).
  • the method of judging whether or not "matching" may include, for example, the received power RSRP maximization criterion described in the first embodiment and the correlation maximization criterion described in the third embodiment. It should be noted that those skilled in the art can easily design other judgment methods according to actual needs, thereby determining weight parameters for weighted combination, and therefore The invention is not limited to the two criteria described above.
  • the network side device can transmit the user-specific reference signal with a more accurate beam, the terminal device can perform more accurate channel measurement, and finally provide more accurate CSI feedback for the network side device.
  • the network side device or base station in the above embodiment may include any type of evolved Node B (eNB), such as a macro eNB and a small eNB.
  • eNB evolved Node B
  • the small eNB may be an eNB covering a cell smaller than the macro cell, such as a pico eNB, a micro eNB, and a home (femto) eNB.
  • the network side device or base station may also include any other type of base station, such as a NodeB and a base transceiver station (BTS).
  • BTS base transceiver station
  • the base station can include: a body (also referred to as a base station device) configured to control wireless communication; and one or more remote wireless headends (RRHs) disposed at a different location than the body.
  • a body also referred to as a base station device
  • RRHs remote wireless headends
  • various types of terminal devices can also operate as base stations by performing base station functions temporarily or semi-persistently.
  • the terminal device or user device in the above embodiment may be implemented as, for example, a communication terminal device such as a smart phone, a tablet personal computer (PC), a notebook PC, a portable game terminal, a portable/encrypted dog type mobile router, and A digital camera device or an in-vehicle terminal device (such as a car navigation device) may also be implemented as a terminal device that performs machine-to-machine (M2M) communication, also referred to as a machine type communication (MTC) terminal device.
  • M2M machine-to-machine
  • MTC machine type communication
  • the terminal device or user device may also be a wireless communication module (such as an integrated circuit module including a single wafer) installed on each of the above terminals.
  • terminal device or user device will be described below with reference to FIG. 14 with a smartphone as an example.
  • Fig. 14 is a block diagram showing a schematic configuration of a smartphone.
  • the smart phone 2500 includes a processor 2501, a memory 2502, a storage device 2503, an external connection interface 2504, an imaging device 2506, a sensor 2507, a microphone 2508, an input device 2509, a display device 2510, a speaker 2511, and a wireless communication interface. 2512, one or more antenna switches 2515, one or more antennas 2516, a bus 2517, a battery 2518, and an auxiliary controller 2519.
  • the processor 2501 may be, for example, a CPU or a system on chip (SoC), and controls the functions of the application layer and the other layers of the smartphone 2500.
  • the memory 2502 includes a RAM and a ROM, and stores data and programs executed by the processor 2501.
  • the storage device 2503 may include a storage medium such as a semiconductor memory and a hard disk.
  • the external connection interface 2504 is an interface for connecting an external device such as a memory card and a universal serial bus (USB) device to the smartphone 2500.
  • USB universal serial bus
  • Camera 2506 includes an image sensor (such as a charge coupled device (CCD) and complementary Metal oxide semiconductor (CMOS)) and generate a captured image.
  • Sensor 2507 can include a set of sensors, such as a measurement sensor, a gyro sensor, a geomagnetic sensor, and an acceleration sensor.
  • the microphone 2508 converts the sound input to the smartphone 2500 into an audio signal.
  • the input device 2509 includes, for example, a touch sensor, a keypad, a keyboard, a button, or a switch configured to detect a touch on the screen of the display device 2510, and receives an operation or information input from a user.
  • the display device 2510 includes screens such as a liquid crystal display (LCD) and an organic light emitting diode (OLED) display, and displays an output image of the smartphone 2500.
  • the speaker 2511 converts the audio signal output from the smartphone 2500 into a sound.
  • the wireless communication interface 2512 supports any cellular communication scheme (such as LTE and LTE-Advanced) and performs wireless communication.
  • Wireless communication interface 2512 may generally include, for example, a baseband (BB) processor 2513 and radio frequency (RF) circuitry 2514.
  • the BB processor 2513 can perform, for example, encoding/decoding, modulation/demodulation, and multiplexing/demultiplexing, and performs various types of signal processing for wireless communication.
  • the RF circuit 2514 may include, for example, a mixer, a filter, and an amplifier, and transmits and receives a wireless signal via the antenna 2516.
  • the wireless communication interface 2512 may be a chip module on which the BB processor 2513 and the RF circuit 2514 are integrated. As shown in FIG. 14, the wireless communication interface 2512 can include a plurality of BB processors 2513 and a plurality of RF circuits 2514. However, the wireless communication interface 2512 can also include a single BB processor 2513 or a single RF circuit
  • the wireless communication interface 2512 can also support additional types of wireless communication schemes, such as short-range wireless communication schemes, near field communication schemes, and wireless local area network (LAN) schemes.
  • the wireless communication interface 2512 can include a BB processor 2513 and RF circuitry 2514 for each wireless communication scheme.
  • Each of the antenna switches 2515 switches the connection destination of the antenna 2516 between a plurality of circuits included in the wireless communication interface 2512, such as circuits for different wireless communication schemes.
  • Each of the antennas 2516 includes a single or multiple antenna elements (such as multiple antenna elements included in a MIMO antenna) and is used by the wireless communication interface 2512 to transmit and receive wireless signals.
  • smart phone 2500 can include multiple antennas 2516. However, smart phone 2500 can also include a single antenna 2516.
  • smart phone 2500 can include an antenna 2516 for each wireless communication scheme.
  • the antenna switch 2515 can be omitted from the configuration of the smartphone 2500.
  • the bus 2517 connects the processor 2501, the memory 2502, the storage device 2503, and the external connection.
  • the interface 2504, the imaging device 2506, the sensor 2507, the microphone 2508, the input device 2509, the display device 2510, the speaker 2511, the wireless communication interface 2512, and the auxiliary controller 2519 are connected to each other.
  • Battery 2518 provides power to various components of smart phone 2500 via feeders, which are shown partially as dashed lines in the figure.
  • the secondary controller 2519 operates the minimum required function of the smartphone 2500, for example, in a sleep mode.
  • the transceiver of the terminal device can be implemented by the wireless communication interface 2512. At least a portion of the functions of the functional units of the terminal device may also be implemented by the processor 2501 or the auxiliary controller 2519. For example, the power consumption of the battery 2518 can be reduced by performing a portion of the functions of the processor 2501 by the auxiliary controller 2519. Further, the processor 2501 or the auxiliary controller 2519 can perform at least a part of the functions of the respective functional units of the terminal device by executing the program stored in the memory 2502 or the storage device 2503.
  • the implementation of the network side device or base station will be described below with reference to FIG. 15 with the eNB as an example.
  • FIG. 15 shows a block diagram of a schematic configuration of an eNB.
  • the eNB 2300 includes one or more antennas 2310 and base station devices 2320.
  • the base station device 2320 and each antenna 2310 may be connected to each other via a radio frequency (RF) cable.
  • RF radio frequency
  • Each of the antennas 2310 includes a single or multiple antenna elements, such as multiple antenna elements included in a multiple input multiple output (MIMO) antenna, and is used by the base station device 2320 to transmit and receive wireless signals.
  • the eNB 2300 may include a plurality of antennas 2310.
  • multiple antennas 2310 can be compatible with multiple frequency bands used by eNB 2300.
  • FIG. 15 shows an example in which the eNB 2300 includes a plurality of antennas 2310, the eNB 2300 may also include a single antenna 2310.
  • the base station device 2320 includes a controller 2321, a memory 2322, a network interface 2323, and a wireless communication interface 2325.
  • the controller 2321 can be, for example, a CPU or a DSP, and operates various functions of higher layers of the base station device 2320. For example, controller 2321 generates data packets based on data in signals processed by wireless communication interface 2325 and delivers the generated packets via network interface 2323. The controller 2321 can bundle data from a plurality of baseband processors to generate bundled packets and deliver the generated bundled packets. The controller 2321 may have a logical function that performs control such as radio resource control, radio bearer control, mobility management, admission control, and scheduling. This control can be performed in conjunction with nearby eNBs or core network nodes.
  • the memory 2322 includes a RAM and a ROM, and stores programs and various classes executed by the controller 2321. Type of control data (such as terminal list, transmission power data, and scheduling data).
  • the network interface 2323 is a communication interface for connecting the base station device 2320 to the core network 2324. Controller 2321 can communicate with a core network node or another eNB via network interface 2323. In this case, the eNB 2300 and the core network node or other eNBs may be connected to each other through a logical interface such as an S1 interface and an X2 interface.
  • the network interface 2323 can also be a wired communication interface or a wireless communication interface for wireless backhaul lines. If the network interface 2323 is a wireless communication interface, the network interface 2323 can use a higher frequency band for wireless communication than the frequency band used by the wireless communication interface 2325.
  • the wireless communication interface 2325 supports any cellular communication schemes, such as Long Term Evolution (LTE) and LTE-Advanced, and provides wireless connectivity to terminals located in cells of the eNB 2300 via the antenna 2310.
  • Wireless communication interface 2325 can typically include, for example, BB processor 2326 and RF circuitry 2327.
  • the BB processor 2326 can perform, for example, encoding/decoding, modulation/demodulation, and multiplexing/demultiplexing, and performs layers (eg, L1, Medium Access Control (MAC), Radio Link Control (RLC), and Packet Data Convergence Protocol (PDCP)) Various types of signal processing.
  • BB processor 2326 may have some or all of the above described logic functions.
  • the BB processor 2326 can be a memory that stores a communication control program, or a module that includes a processor and associated circuitry configured to execute the program.
  • the update program can cause the functionality of the BB processor 2326 to change.
  • the module can be a card or blade that is inserted into the slot of the base station device 2320. Alternatively, the module can also be a chip mounted on a card or blade.
  • the RF circuit 2327 may include, for example, a mixer, a filter, and an amplifier, and transmits and receives a wireless signal via the antenna 2310.
  • the wireless communication interface 2325 can include a plurality of BB processors 2326.
  • multiple BB processors 2326 can be compatible with multiple frequency bands used by eNB 2300.
  • the wireless communication interface 2325 can include a plurality of RF circuits 2327.
  • multiple RF circuits 2327 can be compatible with multiple antenna elements.
  • FIG. 15 illustrates an example in which the wireless communication interface 2325 includes a plurality of BB processors 2326 and a plurality of RF circuits 2327, the wireless communication interface 2325 may also include a single BB processor 2326 or a single RF circuit 2327.
  • the transceiver of the base station side device can be implemented by the wireless communication interface 2325. At least a portion of the functionality of each unit may also be performed by controller 2321.
  • the controller 2321 can perform at least a portion of the functions of the units by executing a program stored in the memory 2322.
  • 16 is a block diagram showing an example configuration of computer hardware that executes the scheme of the present invention in accordance with a program.
  • a central processing unit (CPU) 1601, a read only memory (ROM) 1602, and a random access memory (RAM) 1603 are connected to each other through a bus 1604.
  • Input/output interface 1605 is further coupled to bus 1604.
  • the input/output interface 1605 is connected to an input unit 1606 formed by a keyboard, a mouse, a microphone, or the like; an output unit 1607 formed of a display, a speaker, or the like; a storage unit 1608 formed of a hard disk, a nonvolatile memory, or the like;
  • LAN local area network
  • the CPU 1601 loads the program stored in the storage unit 1608 into the RAM 1603 via the input/output interface 1605 and the bus 1604, and executes the program to execute the above processing.
  • a program to be executed by a computer may be recorded on a removable medium 1611 as a package medium, such as a magnetic disk (including a floppy disk), an optical disk (including a compact disk-read only memory (CD-ROM)), A digital versatile disc (DVD) or the like, a magneto-optical disc, or a semiconductor memory is formed.
  • a program to be executed by a computer can also be provided via a wired or wireless transmission medium such as a local area network, the Internet, or digital satellite broadcasting.
  • the program can be installed in the storage unit 1608 via the input/output interface 1605.
  • the program can be received by the communication unit 1609 via a wired or wireless transmission medium, and the program is installed in the storage unit 1608.
  • the program may be pre-installed in the ROM 1602 or the storage unit 1608.
  • the program to be executed by the computer may be a program that performs processing in accordance with the order described in this specification, or may be a program that executes processing in parallel or performs processing when needed, such as when called.
  • the present invention can also be configured as follows.
  • An electronic device for wireless communication comprising processing circuitry configured to: perform a first channel measurement based on a first reference signal from a target communication device; determine a plurality of based on a result of the first channel measurement
  • the weighting parameter is such that the composite channel obtained by weighting the preset plurality of channel features by using the plurality of weight parameters matches the actual channel, wherein the preset plurality of channel characteristics are the electronic device and the The target communication device is well known; and generating feedback information indicating the plurality of weight parameters for the target communication device.
  • the processing circuit is further configured to: determine the plurality of weight parameters based on a preset codebook, wherein the preset codebook is a real digital book or a plurality of rotated codebooks, and is the electronic device And the target communication device is well known.
  • the feedback information includes an index of a codeword in the codebook corresponding to each weight parameter.
  • the processing circuit further configured to acquire an indication of the updated codebook from the target communication device.
  • processing circuit is further configured to: perform a second channel measurement according to a second reference signal from the target communication device, wherein the second reference signal is the target communication device via the plurality of weights And transmitting, by the weighted combination of the preset plurality of channel characteristics, the synthesized channel; and generating a channel measurement report for the target communication device based on the result of the second channel measurement.
  • the preset multiple channel features include a preset plurality of channel directions.
  • the preset multiple channel features include a preset plurality of base vectors.
  • the preset multiple channel directions correspond to preset multiple beams.
  • the preset multiple channel directions correspond to a preset plurality of precoding matrices.
  • the condition that the composite channel obtained by weighting the preset multiple channel features by using the multiple weight parameters matches the actual channel is that the first reference signal is compared according to the synthesized channel.
  • the receiving power is the largest.
  • the processing circuit is further configured to: estimate an actual channel according to the first channel measurement, where the preset plurality of channel features are weighted by using the plurality of weight parameters
  • the condition that the combined composite channel obtained by combining the actual channel matches is that the composite channel has the greatest correlation with the estimated actual channel.
  • the first reference signal sent by the target communication device is not precoded.
  • the electronic device is implemented as a terminal device, and the electronic device further includes: a memory, the memory is configured to store the preset multiple channel features; one or more antennas, and the antenna is used for The target communication device transmits a signal or receives a signal from the target communication device.
  • a method performed in a terminal device comprising: performing a first channel measurement according to a first reference signal transmitted by a target communication device; determining a plurality of weight parameters based on a result of the first channel measurement, such that the plurality of The weighting parameter matches the preset combined channel of the plurality of channel features to the actual channel, wherein the preset plurality of channel features are known by the terminal device and the target communication device; generating And indicating feedback information of the plurality of weight parameters to be sent to the target communication device; performing second channel measurement according to the second reference signal sent by the target communication device, wherein the second reference signal is the target Transmitting, by the communication device, a composite channel obtained by weighting the predetermined plurality of channel characteristics based on the plurality of weight parameters; and generating a channel measurement report based on a result of the second channel measurement to transmit to the The target communication device.
  • An electronic device for wireless communication comprising processing circuitry configured to: generate a first reference signal to be transmitted to a target communication device; utilize a plurality of feedback information provided by the target communication device Weighting parameters, weighting a plurality of preset channel characteristics to obtain a composite channel, wherein the plurality of weight parameters are determined by the target communication device by performing first channel measurement by using the first reference signal
  • the composite channel obtained by weighting and combining the preset plurality of channel features by using the plurality of weight parameters is matched with an actual channel, wherein the preset plurality of channel features are the electronic device and
  • the target communication device is well known.
  • processing circuit is further configured to: generate a second reference signal to be transmitted to the target communication device, wherein the second reference signal is transmitted via the composite channel; based on a channel provided by the target communication device A measurement report is configured to configure a transmission channel, wherein the channel measurement report is obtained by the target communication device performing a second channel measurement by using the second reference signal.
  • the target communication device determines the plurality of weight parameters based on a preset codebook, wherein the preset codebook is a real digital book or a plurality of rotated codebooks, and is the target communication.
  • the preset codebook is a real digital book or a plurality of rotated codebooks, and is the target communication.
  • the device and the electronic device are well known.
  • the feedback information includes an index of a codeword in the codebook corresponding to each weight parameter.
  • processing circuit is further configured to: semi-statically configure the preset codebook and generate an indication of the updated codebook for the target communication device.
  • the preset multiple channel features include a preset plurality of channel directions.
  • the preset multiple channel features include a preset plurality of base vectors.
  • the preset multiple channel directions correspond to preset multiple beams.
  • the preset multiple channel directions correspond to a preset plurality of precoding matrices.
  • the condition that the composite channel obtained by weighting the preset multiple channel features by using the multiple weight parameters matches the actual channel is that the first reference signal is compared according to the synthesized channel.
  • the receiving power is the largest.
  • the first reference signal sent to the target communication device is not precoded.
  • the electronic device is implemented as a network side device, and the electronic device further includes: a memory, the memory is configured to store the preset multiple channel features; and multiple antennas, the multiple antennas are used to
  • the target communication device transmits a signal or receives a signal from the target communication device.
  • a method performed in a network side device comprising: transmitting a first reference signal to a target communication device; weighting a plurality of preset channel characteristics by using a plurality of weight parameters provided by the target communication device, to Obtaining a composite channel, wherein the plurality of weight parameters are determined by the target communication device by performing first channel measurement by using the first reference signal, so that the preset is used by using the multiple weight parameters
  • the composite channel obtained by performing weighted combination of the channel characteristics matches the actual channel, wherein the preset plurality of channel characteristics are known by the network side device and the target communication device; Transmitting a reference signal to the target communication device; configuring a transport channel based on a channel measurement report provided by the target communication device, wherein the channel measurement report is that the target communication device performs a second by utilizing the second reference signal Obtained by channel measurement.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé de communication sans fil et un dispositif de communication sans fil. Le dispositif de communication sans fil comprend un circuit de traitement. Le circuit de traitement est configuré pour effectuer une première mesure de canal selon un premier signal de référence provenant d'un dispositif de communication cible, déterminer une pluralité de paramètres de pondération sur la base d'un résultat de la première mesure de canal, de telle sorte qu'un canal synthétisé obtenu par la réalisation d'une combinaison pondérée sur une pluralité de caractéristiques de canal prédéfinies à l'aide de la pluralité de paramètres de pondération correspond à un canal réel, la pluralité de caractéristiques de canal prédéfinies étant connues par le dispositif de communication sans fil et le dispositif de communication cible, et générer des informations de rétroaction pour indiquer la pluralité de paramètres de pondération pour envoyer les informations de rétroaction au dispositif de communication cible.
PCT/CN2017/102406 2016-11-25 2017-09-20 Procédé de communication sans fil et dispositif de communication sans fil WO2018095122A1 (fr)

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CN201611062917.X 2016-11-25

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CN108923981B (zh) * 2018-07-12 2021-04-20 电子科技大学 下行miso网络中接入控制和波束赋形的联合优化方法
CN113965232B (zh) * 2019-01-30 2024-04-09 华为技术有限公司 信息反馈方法及装置
EP3925081A4 (fr) * 2019-02-14 2022-11-02 Sony Group Corporation Procédés de signalisation de correspondance de faisceau, dispositifs sans fil associés, et noeuds de réseau associés
CN114698019A (zh) * 2019-04-30 2022-07-01 华为技术有限公司 测量上报的方法与装置
CN113840311B (zh) * 2021-09-06 2023-03-31 哲库科技(北京)有限公司 数据压缩方法、装置、电子设备及存储介质

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CN105247809A (zh) * 2013-05-31 2016-01-13 高通股份有限公司 全维mimo系统中的线性预编码和动态垂直扇区化
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