WO2018095168A1 - 电子设备和通信方法 - Google Patents

电子设备和通信方法 Download PDF

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Publication number
WO2018095168A1
WO2018095168A1 PCT/CN2017/106996 CN2017106996W WO2018095168A1 WO 2018095168 A1 WO2018095168 A1 WO 2018095168A1 CN 2017106996 W CN2017106996 W CN 2017106996W WO 2018095168 A1 WO2018095168 A1 WO 2018095168A1
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Prior art keywords
terminal devices
reference signal
base station
information
terminal device
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English (en)
French (fr)
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曹建飞
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Sony Corp
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Sony Corp
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Priority to EP17874167.4A priority Critical patent/EP3547563A4/en
Priority to US16/323,660 priority patent/US10804977B2/en
Priority to CN201780071542.XA priority patent/CN109997317A/zh
Publication of WO2018095168A1 publication Critical patent/WO2018095168A1/zh
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1221—Wireless traffic scheduling based on age of data to be sent
    • 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
    • H04B7/0452—Multi-user MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0417—Feedback systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—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
    • H04B7/06—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
    • H04B7/0602—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 antenna switching
    • 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
    • H04B7/063—Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0062—Avoidance of ingress interference, e.g. ham radio channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality

Definitions

  • the present disclosure relates to an electronic device and a communication method, and more particularly, to an electronic device and a communication method in a Multi-User Multi-Input Multi-Output (MU-MIMO) system.
  • MU-MIMO Multi-User Multi-Input Multi-Output
  • MU-MIMO technology can be utilized to increase the system capacity of the LTE system to meet the ever-increasing traffic demand.
  • time-frequency resources of different antennas are allocated to multiple user equipments (UEs) (also referred to as terminal devices), so that multiple UEs can spatially share time-frequency resources, thereby increasing the same
  • UEs user equipments
  • terminal devices also referred to as terminal devices
  • the base station needs to collect, from multiple UEs, channel quality information (CQI) that each UE measures and calculates the local cell reference signal and the neighbor cell reference signal, and performs, for example, link adaptation based on the collected CQI.
  • CQI channel quality information
  • MCS modulation coding strategy
  • the CQI is an indicator of the channel quality of the UE reflected in a Single User MIMO (SU-MIMO) state, that is, the prior art currently only supports scheduling a single cell in one cell.
  • CQI in the case of UE rather than CQI in the case of scheduling multiple UEs. Therefore, the CQI collected by the base station from each UE cannot reflect the interference caused by other UEs in the real MU-MIMO state to the UE, so that the base station cannot know the actual channel state in the MU-MIMO state. Therefore, in the existing MU-MIMO system, it is difficult for the base station to perform accurate MU-MIMO scheduling.
  • an electronic device for a first terminal device side of a wireless communication system can include: a memory for storing computer instructions; and processing circuitry configured to execute the stored computer instructions for: measuring the first precoded first reference signal from the base station, wherein The first precoding first precoding matrix is determined by the base station according to respective channel states fed back from the plurality of candidate terminal devices, wherein the plurality of candidate terminal devices comprise the first terminal device; based on the result of the measurement And determining, according to the information about the first precoding, interference of other terminal devices of the plurality of candidate terminal devices to the first terminal device; and feeding back information indicating the interference to the base station.
  • an electronic device for a base station side of a wireless communication system can include: a memory for storing computer instructions; and processing circuitry configured to execute the stored computer instructions for determining for the respective channel states based on feedback from the plurality of candidate terminal devices a first precoding matrix of the plurality of candidate terminal devices; performing first precoding on the first reference signal by using the first precoding matrix; and transmitting the first precoded first reference signal to the plurality of a candidate terminal device; and based on the measurement result of the received first precoded first reference signal and the information about the first precoding according to each of the plurality of candidate terminal devices And the feedback information, the plurality of candidate terminal devices are scheduled, wherein the information fed back by each terminal device indicates interference of the other terminal devices of the plurality of candidate terminal devices to the terminal device.
  • a communication method for a wireless communication system may include the first terminal device measuring the first precoded first reference signal from the base station, wherein the first precoding matrix for the first precoding is based on feedback from the plurality of candidate terminal devices by the base station Determining a respective channel state, wherein the plurality of candidate terminal devices comprise a first terminal device; the first terminal device determining the plurality of candidate terminals based on a result of the measuring and information regarding the first precoding Interference of the other terminal device in the device with the first terminal device; and the first terminal device feeds back information indicating the interference to the base station.
  • a communication method for a wireless communication system may include: determining, by the base station, a first precoding matrix for the plurality of candidate terminal devices according to respective channel states fed back from the plurality of candidate terminal devices; the base station using the first precoding matrix to the first reference Transmitting, by the base station, the first pre-coded first reference signal to the plurality of terminal devices; and the base station is based on the received ones according to each of the plurality of terminal devices
  • the measurement result of the first pre-coded first reference signal is And the information about the first pre-encoded information, the plurality of candidate terminal devices are scheduled, wherein the information fed back by each terminal device indicates that the other terminal devices of the plurality of candidate terminal devices are to the terminal Equipment interference.
  • a computer readable storage medium comprising executable instructions that, when executed by an information processing apparatus, cause the information processing apparatus to perform a communication method according to the present disclosure.
  • FIG. 1 is a schematic diagram showing a MU-MIMO system
  • FIG. 3 is a signaling diagram illustrating performing MU-MIMO scheduling according to an embodiment of the present disclosure
  • FIG. 4 is a block diagram showing a functional configuration of an electronic device for a first terminal device side of a wireless communication system, according to an embodiment of the present disclosure
  • FIG. 5 is a flowchart illustrating a first terminal device side communication method for a wireless communication system according to an embodiment of the present disclosure
  • FIG. 6 is a functional configuration block diagram showing an electronic device for a base station side of a wireless communication system, according to an embodiment of the present disclosure
  • FIG. 7 is a flowchart illustrating a communication method for a base station side of a wireless communication system according to an embodiment of the present disclosure
  • FIG. 8 is a signaling diagram illustrating performing MU-MIMO scheduling according to an embodiment of the present disclosure
  • FIGS. 9A-9F are schematic diagrams showing occupancy of a reference signal on a resource block, according to an embodiment of the present disclosure.
  • 10A-10B are schematic diagrams showing occupancy of a reference signal on a resource block, according to another embodiment of the present disclosure.
  • 11A-11B are schematic diagrams showing occupancy of a reference signal on a resource block, according to another embodiment of the present disclosure.
  • 12A-12B are schematic diagrams showing occupancy of a reference signal on a resource block, according to another embodiment of the present disclosure.
  • FIG. 13 is a block diagram showing a first example of a schematic configuration of an eNB according to an embodiment of the present disclosure
  • FIG. 14 is a block diagram showing a second example of a schematic configuration of an eNB according to an embodiment of the present disclosure.
  • 15 is a block diagram showing an example of a schematic configuration of a smartphone according to an embodiment of the present disclosure.
  • FIG. 16 is a block diagram showing an example of a schematic configuration of a car navigation device according to an embodiment of the present disclosure.
  • a base station such as an evolved Node B (eNB) has multiple antennas that support MIMO technology.
  • 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 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 achieved 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 (DL) through multiple transmit antennas. of.
  • Spatial precoding The 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.
  • 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
  • SC-FDMA single carrier frequency division multiple access
  • DFT discrete Fourier transform
  • the radio protocol architecture for the user plane and the control plane in LTE is explained.
  • the radio protocol architecture for the UE and the eNB is shown with 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) terminated at the PDN gateway on the network side, and terminated at the other end of the connection (eg, a remote UE, a server, etc.) ) the application layer.
  • a network layer eg, an IP layer
  • 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 radio frequency (RF) carrier and provides this information to the various signal processing functions of the L1 layer.
  • Spatial processing is performed on the information at the L1 layer to recover any spatial streams destined for the UE. 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
  • 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 shared 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 CRI CSI-RS Resource Indicator
  • the UE measures each CSI-RS resource and feeds back the recommended beam in the form of a CRI.
  • FD-MIMO full-dimension 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 can result in greater beamforming gain and introduce less interference to neighboring 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 either fed back by the UE PMI/RI or by utilizing channel reciprocity.
  • 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 DL full channel.
  • the pilot (or shared reference signal) overhead and DL 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 eNB first uses a preset multiple CSI-RS resources to transmit multiple CSI-RS beams shared by the cell for UE measurement, and then The UE obtains its measured long-term/rough CSI and then compresses a larger number of antennas to a smaller number of antenna ports based on long-term/rough CSI. The UE measures short-term CSI on a smaller number of antenna ports than on a larger number of antennas. UE can quantify short The CSI is scheduled and fed back to the eNB.
  • the eNB may use the quantized short-term CSI to map multiple data layers to UE-specific antenna ports (eg, using layer precoders), thereby reducing channel estimation complexity and CSI feedback overhead.
  • the MU-MIMO system will be briefly described below with reference to FIG.
  • the MU-MIMO system 1000 includes a base station 1002 and a plurality of terminal devices 1006, 1008, 1010, and 1012. Base station 1002 and a plurality of terminal devices 1006, 1008, 1010, and 1012 are located within cell 1004.
  • the base station described in the present specification can be implemented as any type of eNB or other type of base station or the like (see “Application Example Regarding Base Station” described later);
  • the terminal device described in the specification of the present disclosure can be The mobile terminal or the in-vehicle terminal or the like (see “Application example regarding the terminal device” described later), and the terminal device is sometimes referred to as a UE.
  • the base station 1002 can simultaneously schedule a plurality of terminal devices on the same time-frequency resource block (RB), so that the modulation symbol streams of the plurality of terminal devices are on the same time-frequency resource.
  • RB time-frequency resource block
  • terminal devices 1006, 1008, 1010, and 1012 can be co-scheduled on the same time-frequency resource and in different spaces (shown as four "beams" in FIG. 1).
  • the terminal devices 1006, 1008, and 1010 occupy the same time-frequency resource, and the spatial distance between each other is relatively close or the channels between the respective terminal devices and the base station are highly correlated with each other, they are in the process of data transmission. There is interference between them.
  • the base station 1002 When performing MU-MIMO data transmission, the base station 1002 calculates a precoding matrix based on channel states of respective terminal devices (e.g., terminal devices 1006, 1008, 1010, and 1012) participating in multi-user transmission and transmits data using a corresponding beamforming scheme.
  • the signals are such that different terminal devices correspond to different spatial beams, as shown in FIG.
  • the base station calculates the MU-CQI of multiple MU-MIMO user combinations according to the CSI (including CQI and PMI) reported by the currently served users to determine the MU-MIMO user selection. And/or a transmission coding scheme for each user, thereby lacking mechanisms to support channel state measurements consistent with actual MU-MIMO data transmission.
  • the base station shown in FIG. 2 may correspond to the base station 1002 shown in FIG. 1, and the terminal device shown in FIG. 2 may correspond to any of the terminal devices 1006, 1008, 1010, and 1012 shown in FIG. 1.
  • step S2000 the base station sends a CSI-RS to the terminal device for estimating the downlink channel state.
  • the terminal device measures the received CSI-RS to determine a channel state.
  • the resulting channel state information may include RI, PMI, and CQI.
  • the CQI only indicates the channel quality in the case of scheduling a single terminal device in the cell (i.e. CQI SU), but does not reflect the interference in the same cell at the other terminal of the terminal device.
  • step S2004 the terminal device feeds back channel state information, including RI, PMI, and CQI SU , to the base station.
  • the base station adjusts the CQI SU to a multi-user CQI related to interference of other terminal devices in the cell, that is, CQI MU .
  • the base station can adjust the received CQI SU to the CQI MU according to a link adaptation technique or the like.
  • step S2008 the base station performs MU-MIMO scheduling on a plurality of terminal devices in the cell by using the CQI MU .
  • the technique of adjusting the CQI SU to the CQI MU has a problem of inaccurate adjustment, which may affect the performance of the MU-MIMO scheduling.
  • the present invention proposes a method for obtaining information that more accurately reflects interference between a plurality of terminal devices in a cell, which facilitates more accurate MU-MIMO scheduling.
  • the MU-MIMO scheduling shown in FIG. 3 can be applied, for example, to the MU-MIMO system 1000 shown in FIG. 1.
  • the base station shown in FIG. 3 may correspond to the base station 1002 shown in FIG. 1
  • the K candidate terminal devices (terminal device 1, ..., terminal device K, where K is a natural number) shown in FIG. 3 may correspond to One or more of the terminal devices 1006, 1008, 1010, and 1012 shown in FIG. 1 may also be more.
  • the base station selects candidate terminal devices for which MU-MIMO scheduling is to be performed based on the conditions of the active terminal devices in the cell. Specifically, in an example, the base station selects K destination terminal devices from the active terminal devices in the cell as candidate terminal devices according to the destination terminal device of the downlink data to be transmitted in the downlink transmission buffer. In another example, the base station determines, as a candidate terminal device, a terminal device having a small channel correlation with each other based on a channel state fed back by the active terminal device in the cell, such as PMI or CRI. Specifically, the base station receives CRIs respectively fed back by multiple active terminal devices to initially determine which terminal devices are suitable as user combinations of MU-MIMO and which are not suitable.
  • the spatial isolation of the two terminal devices may be roughly considered to be poor, and is not suitable as a user combination of MU-MIMO;
  • the two terminal devices are considered suitable as a user combination of MU-MIMO. This process can effectively eliminate many unsuitable MU-MIMO user combinations, thereby reducing the complexity of candidate terminal device selection and reducing the burden of multi-user interference measurements.
  • the base station selects K terminal devices as candidate terminal devices for performing MU-MIMO scheduling according to the situation of active terminal devices in the cell.
  • the base station determines a first precoding matrix for beamforming the K candidate terminal devices according to respective channel states fed back from the K candidate terminal devices.
  • the first precoding matrix is the same as the precoding matrix for data employed in the case where the above K candidate terminal devices are finally selected for MU-MIMO transmission.
  • the first precoding matrix performs partial dimension (eg, vertical dimension or horizontal dimension) beamforming on the K candidate terminal devices. In another embodiment, the first precoding matrix performs full dimension beamforming on the K candidate terminal devices.
  • feedback of the respective channel states by the K candidate terminal devices may be implemented using the prior art shown in FIG. 2, such as shown in steps S2000, S2002, and S2004 of FIG.
  • the channel states fed back from each candidate terminal device include RI, PMI, and CQI SU .
  • step S3002 the base station performs first precoding on the reference signal for measuring interference between the terminal devices by using the first precoding matrix to obtain a first precoded reference signal (Precoded-RS, PC-RS for short).
  • the reference signal used to measure inter-terminal interference may be a dedicated reference signal.
  • the reference signal used to measure interference between the end devices can be implemented by using an existing CSI-RS (for example, Class B CSI in the current standard), and the base station performs the CSI-RS with the first precoding matrix.
  • the first precoding obtains a first precoded CSI-RS (Precoded-CSI-RS, PC-CSI-RS for short).
  • the base station may notify the K candidate terminal devices whether the PC-CSI-RS is used to measure interference between the terminal devices or to acquire the legacy CSI.
  • the conventional CSI may include, for example, RI, PMI, and CQI, which can be obtained by a method of measuring CSI-RS in the prior art.
  • step S3004 the base station transmits a PC-RS to each of the K candidate terminal devices.
  • the PC-RS transmitted by the base station to the K candidate terminal devices may be a PC-CSI-RS.
  • the K candidate terminal devices respectively measure the PC-RS. Since the PC-RS experiences the first precoding for beamforming before transmission, the channel state reflected by the measurement result is closer to the channel state when the MU-MIMO data transmission is actually performed. Specifically, the measurement result of each terminal device to the PC-RS includes interference from other terminal devices.
  • each of the K candidate terminal devices determines interference caused by other K-1 terminal devices according to the received measurement result of the PC-RS.
  • step S3010 the K candidate terminal devices respectively feed back information indicating the interference to the base station.
  • step S3012 the base station performs MU-MIMO scheduling based on the information indicating the interference fed back from the K candidate terminal devices.
  • steps S3002 through S3008 may be exemplarily described mathematically.
  • the reference signal in step S3002 is set to signal s, and the first pre-coded reference signal PC-RS can be represented as Vs.
  • the channel of the base station to the terminal device i can be represented as a vector H i of 1 ⁇ n t , where 1 ⁇ i ⁇ K.
  • the received signal at the terminal device i can be expressed as:
  • n i represents the reception noise at the terminal device i, which is a vector of 1 ⁇ K
  • y i represents the transpose of y i as a vector of 1 ⁇ K.
  • Receive signal Indicates the result of the measurement of the PC-RS by the terminal device i.
  • the equivalent channel H effi can be estimated by various estimation methods (for example, least squares method), which is not limited in the present invention.
  • the value of the i-th column, ie, H i v i indicates the equivalent channel of the terminal device i
  • the values of the K-1 column other than the i-th column indicate K candidates, respectively.
  • the equivalent interference channel of the other K-1 terminal devices in the terminal device to the terminal device i can be determined.
  • the terminal device i can determine the information indicating the interference based on the estimated equivalent channel H effi .
  • the terminal device i may determine the received signal strength S terminal apparatus i, i from the value of the i-th column of the equivalent channel H effi according to, and may determine the terminal device j from the value j-th column of the equivalent channel H effi in The interference value I j to the terminal device i, where 1 ⁇ j ⁇ K and j ⁇ i.
  • each of the K candidate terminal devices is equipped with one receiving antenna. It should be understood that the processing is similar for the case where the terminal device has multiple receiving antennas. Therefore, in the case where the K candidate terminal devices include a terminal device equipped with one receiving antenna and a terminal device equipped with a plurality of receiving antennas, the base station can also obtain an indication from the K candidate terminal devices in the manner shown in FIG. Interfering information for MU-MIMO scheduling.
  • the MU-MIMO scheduling will be described in detail later with reference to FIG.
  • the base station can comprehensively consider the indication fed back by each terminal device. Interfering information for accurate MU-MIMO scheduling.
  • the first terminal device may, for example, correspond to any one of the K candidate terminal devices shown in FIG.
  • FIG. 4 illustrates a functional configuration block diagram of an electronic device 4000 for a first terminal device side of a wireless communication system, according to an embodiment of the present disclosure.
  • electronic device 4000 can include, for example, memory 4010 processing circuitry 4020.
  • the memory 4010 of the electronic device 4000 can store information generated by the processing circuit 4020 and programs and data for operation of the electronic device 4000.
  • the memory 4010 can be a volatile memory and/or a non-volatile memory.
  • memory 4010 can include, but is not limited to, random access memory (RAM), dynamic random access memory (DRAM), static random access memory (SRAM), read only memory (ROM), and flash memory.
  • Processing circuitry 4020 of electronic device 4000 provides various functions of electronic device 4000.
  • the processing circuit 4020 of the electronic device 4000 may include a first reference signal measuring unit 4021, an interference determining unit 4022, and an information feedback unit 4023, respectively configured to perform the steps shown in FIG. 5 described later. Steps S5000, S5002, and S5004 in the communication method of the electronic device on the first terminal device side of the wireless communication system.
  • the processing circuit 4020 may further include a second reference signal measuring unit 4024 and a channel state feedback unit 4025 configured to respectively execute the first terminal for the wireless communication system shown in FIG. 5 described later. Steps S5006 and S5008 in the communication method of the electronic device on the device side.
  • Processing circuitry 4020 may refer to various implementations of digital circuitry, analog circuitry, or mixed signal (combination of analog and digital) circuitry that perform functions in a computing system.
  • Processing elements may include, for example, circuits such as integrated circuits (ICs), application specific integrated circuits (ASICs), portions or circuits of individual processor cores, entire processor cores, separate processors, such as field programmable gate arrays (FPGAs) Programmable hardware device, and/or system including multiple processors.
  • ICs integrated circuits
  • ASICs application specific integrated circuits
  • FPGAs field programmable gate arrays
  • the electronic device 4000 can be implemented at the chip level, or can be implemented at the device level by including other external components.
  • the electronic device 4000 can be implemented as a first terminal device as a complete machine, and can also include one or more antennas.
  • each of the above functional units may be implemented as a separate physical entity, or may be implemented by a single entity (eg, a processor (CPU or DSP, etc.), an integrated circuit, etc.).
  • FIG. 5 illustrates a flowchart of a first terminal device side communication method for a wireless communication system, according to an embodiment of the present disclosure. This communication method can be used, for example, for the electronic device 4000 as shown in FIG.
  • a first precoded first reference signal from a base station is measured, wherein the first precoding matrix for the first precoding is based on feedback from the plurality of candidate terminal devices by the base station Determined by respective channel states, wherein the plurality of candidate terminal devices include the first terminal device.
  • the first reference signal may correspond, for example, to the reference signal in step S3002 of FIG. 3, and the first pre-coded first reference signal may correspond to the PC-RS in FIG.
  • Step S5000 may correspond, for example, to step S3006 in FIG.
  • the first precoding matrix may be used to beamform the first reference signal transmitted to the plurality of candidate terminal devices.
  • the determining criterion of the first precoding matrix may be such that the first precoded channel between the plurality of candidate terminal devices is least correlated.
  • a known algorithm such as a zero forcing algorithm can be used to determine the first precoding matrix.
  • step S5002 based on the result of the measurement and the information about the first precoding, interference of the other terminal devices of the plurality of candidate terminal devices with the first terminal device is determined.
  • Step S5002 may correspond, for example, to step S3008 in FIG.
  • the information about the first precoding may be used to help determine interference of other terminal devices with the first terminal device.
  • the information about the first precoding may include the number of candidate terminal devices, the information of the layer where the first terminal device is located (representing the number of the layer on the time-frequency resource block used for transmission to the first terminal device, for example, the terminal device i number i) and so on. As shown in [Equation 2] described with reference to FIG. 3, this information can be used to help estimate the equivalent channel H effi .
  • the information about the first pre-coding may further include information of a layer where the candidate terminal device other than the first terminal device (for example, the terminal device i) is located (for example, the number j of the terminal device j) to determine the terminal device j.
  • the information about the first precoding may further include a reference signal type indicator for indicating a type of the first reference signal.
  • the reference signal type indicator may indicate whether the first precoded first reference signal from the base station is used to measure interference between multiple candidate terminal devices or Used to obtain traditional CSI.
  • the information about the first precoding may be sent by the base station to each terminal device, or may be default, preset, or estimated by the terminal device according to the measurement situation. This will be described in more detail later with reference to FIG. 8.
  • step S5004 information indicating interference is fed back to the base station.
  • Step S5004 may correspond, for example, to step S3010 in FIG.
  • the first reference signal is received from the base station via the antenna of the electronic device 4000 illustrated in FIG. 4, and information indicating the interference is transmitted to the base station via the antenna.
  • the information indicating the interference may include information indicating interference of all other terminal devices of the plurality of candidate terminal devices with the first terminal device.
  • the first terminal device is the terminal device i.
  • the terminal device i feeds back the value of the K-1 column other than the i-th column or the quantized value in the H effi to the base station according to the equivalent channel H effi estimated by [Equation 2], and the base station can
  • the combination of the terminal devices to perform the actual MU-MIMO transmission and the modulation and coding strategies of the respective terminal devices in the combination of the terminal devices are determined based on the information indicating the interference fed back from each candidate terminal device.
  • the information indicating the interference may include information indicating one or more terminal devices of the plurality of candidate terminal devices that the interference to the first terminal device is less than a predetermined threshold, and the base station may feedback according to the candidate terminal devices.
  • the indication of interference is used to determine the combination of terminal devices for which actual MU-MIMO transmission is to be performed.
  • the first terminal device is the terminal device i.
  • the interference value smaller than the predetermined threshold value obtained from the equivalent channel Heffi estimated by [Equation 2] is the interference value I m of the terminal device m and the interference value I n of the terminal device n (1 ⁇ m ⁇ K, 1 ⁇ n , respectively) ⁇ K)
  • the information m, n of the layer corresponding to the terminal device m and the terminal device n can be fed back to the base station as information indicating interference according to the interference value from small to large or from large to small. Since only the information of the corresponding layer is fed back without feeding back a specific interference value, the signaling overhead can be reduced.
  • the predetermined threshold may be preset between the base station and the first terminal device. In another embodiment, the predetermined threshold may be configured by the base station in advance for the first terminal device. In addition, the predetermined threshold may vary depending on channel conditions.
  • the information indicating the interference may include information indicating one or more terminal devices of the plurality of candidate terminal devices that the interference to the first terminal device is less than a predetermined threshold, and the corresponding interference value
  • the base station may The information indicating the interference fed back by each candidate terminal device determines a combination of terminal devices to perform actual MU-MIMO transmission and a modulation and coding strategy of each terminal device in the combination of the terminal devices.
  • the information indicating the interference may include the interference value I m and the interference value I n , or the interference value I m and the interference value I n in addition to the information m, n of the layer corresponding to the terminal device m and the terminal device n . And I m +I n .
  • the information indicating the interference may include information indicating one or more terminal devices of the plurality of candidate terminal devices that interfere with the first terminal device is less than a predetermined threshold, and regarding the one or more terminal devices And performing information of a signal to interference and noise ratio (SINR) of the MU-MIMO communication with the first terminal device, the base station may determine, according to the information indicating the interference fed back from each candidate terminal device, a combination of terminal devices to perform actual MU-MIMO transmission And a modulation and coding strategy of each terminal device in the combination of the terminal devices.
  • SINR signal to interference and noise ratio
  • the SINR of the terminal devices m and n performing MU-MIMO communication with the terminal device i can be obtained based on the interference values I m and I n of the terminal devices m and n to the terminal device i and the received signal strength S i of the terminal device i.
  • the information about the SINR may be channel quality information, ie, CQI MU , that reflects interference of other terminal devices by quantizing the SINR.
  • the information indicating the interference may include information indicating a predetermined number of terminal devices of the plurality of candidate terminal devices that minimize interference with the first terminal device, the base station may according to the indication fed back from each candidate terminal device
  • the interference information determines the combination of terminal devices for which actual MU-MIMO transmission is to be performed.
  • the predetermined number may be preset between the base station and the first terminal device.
  • the predetermined number The first terminal device may be configured in advance by the base station.
  • the predetermined number may vary depending on channel conditions.
  • the information indicative of the interference may be represented by a bit map.
  • the candidate terminal device is [UE 1 , UE 2 , UE 3 , UE 4 ], where UE 1 is the first terminal device and assumes that the predetermined number is 2.
  • the UE 1 may feed back the bit pattern 1101 to the base station.
  • the bit pattern 1101 indicates that the terminal devices recommended by the UE 1 for performing MU-MIMO scheduling are UE 1 , UE 2, and UE 4 . Since only the information of the corresponding UE is fed back without feeding back a specific interference value, the signaling overhead can be reduced.
  • the information indicating the interference may include information indicating a predetermined number of terminal devices of the plurality of candidate terminal devices that have the least interference to the first terminal device and corresponding interference values, and the base station may according to each candidate terminal
  • the information indicating the interference fed back by the device determines a combination of terminal devices to perform actual MU-MIMO transmission and a modulation coding strategy of each terminal device in the combination of the terminal devices.
  • information indicating the interference in addition to including the minimum UE information indicating that the UE interference 12 and the UE. 4 outside, may also include a UE 2 and UE 4 I 4, or the interference values interference value of UE 1 I 2, and interference values interference values I 2 and I and I 2 + I 4 4 of.
  • the information indicating the interference may include information indicating a predetermined number of terminal devices of the plurality of candidate terminal devices that have the least interference to the first terminal device, and the predetermined number of the terminal devices are performed with the first terminal device
  • the information of the signal to interference and noise ratio of the MU-MIMO communication the base station may determine, according to the information indicating the interference fed back from each candidate terminal device, a combination of terminal devices to perform actual MU-MIMO transmission and each of the combinations of the terminal devices Modulation coding strategy of the terminal device.
  • the SINR may be fed in the presence of interfering UE 2 and UE 4 is the pair of of UE 1.
  • the communication method on the first terminal device side of the wireless communication system may further include steps S5006 and S5008.
  • a second reference signal from the base station is measured.
  • the second reference signal may for example be a CSI-RS in the prior art.
  • Step S5006 may correspond to step S2002 in FIG. 2, which is a step of measuring CSI-RS in the prior art, which does not consider interference between different terminal devices in the same cell.
  • step S5008 the channel state of the first terminal device is determined based on the measurement result of the second reference signal and fed back to the base station for the base station to determine the first precoding matrix.
  • the information fed back to the base station may be, for example, the channel state information fed back in step S2004 when the MU-MIMO scheduling is performed in the prior art shown in FIG. 2, that is, may include RI, PMI, and CQI SU .
  • the terminal device can quantify short-term CSI and It is fed back to the base station.
  • the short-term CSI includes interference caused by other terminal devices to the terminal device, it cannot indicate which terminal devices are caused by the interference, and the specific interference value cannot be determined therefrom.
  • the terminal device is capable of determining interference caused by other ones of the K candidate terminal devices, and feeding back information indicating interference to the base station, such as one of the information indicating interference described above. Or multiple.
  • the base station can more accurately grasp the situation of the interference received by each terminal device, thereby performing more accurate MU-MIMO scheduling.
  • the base station may, for example, correspond to the base station shown in FIG.
  • FIG. 6 illustrates a functional configuration block diagram of an electronic device 6000 for a base station side of a wireless communication system, according to an embodiment of the present disclosure.
  • electronic device 6000 may include, for example, memory 6010 processing circuitry 6020.
  • the memory 6010 of the electronic device 6000 can store information generated by the processing circuit 6020 and programs and data operated by the electronic device 6000.
  • the memory 6010 can be a volatile memory and/or a non-volatile memory.
  • memory 6010 can include, but is not limited to, random access memory (RAM), dynamic random access memory (DRAM), static random access memory (SRAM), read only memory (ROM), and flash memory.
  • Processing circuitry 6020 of electronic device 6000 provides various functions of electronic device 6000.
  • the processing circuit 6020 of the electronic device 6000 may include a first precoding matrix determining unit 6021, a first precoding unit 6022, a first reference signal transmitting unit 6023, and a scheduling unit 6024, respectively configured to perform Steps S7000, S7002, S7004, and S7006 in the communication method of the electronic device on the base station side for the wireless communication system shown in FIG. 7 will be described later.
  • the processing circuit 6020 may further include a second reference signal transmitting unit 6025 configured to perform the communication method of the electronic device on the base station side for the wireless communication system shown in FIG. 7 to be described later. Step S7008.
  • Processing circuitry 6020 may refer to various implementations of digital circuitry, analog circuitry, or mixed signal (combination of analog and digital) circuitry that perform functions in a computing system.
  • Processing elements may include, for example, circuits such as integrated circuits (ICs), application specific integrated circuits (ASICs), portions or circuits of individual processor cores, entire processor cores, separate processors, such as field programmable gate arrays (FPGAs) Programmable hardware device, and/or system including multiple processors.
  • ICs integrated circuits
  • ASICs application specific integrated circuits
  • FPGAs field programmable gate arrays
  • the electronic device 6000 can be implemented at the chip level, or can be implemented at the device level by including other external components.
  • the electronic device 6000 can be implemented as a base station device as a complete machine, and can also include one or more antennas.
  • each of the above functional units may be implemented as a separate physical entity, or may be implemented by a single entity (eg, a processor (CPU or DSP, etc.), an integrated circuit, etc.).
  • FIG. 7 illustrates a flow chart of a communication method for a base station side of a wireless communication system, according to an embodiment of the present disclosure. This communication method can be used, for example, for the electronic device 6000 as shown in FIG. 6.
  • step S7000 a first precoding matrix for a plurality of candidate terminal devices is determined based on respective channel states fed back from a plurality of candidate terminal devices.
  • Step S7000 may correspond, for example, to step S3000 in FIG.
  • the first precoding matrix may be used to beamform the first reference signal to be transmitted to the plurality of candidate terminal devices.
  • the determining criterion of the first precoding matrix is such that the first precoded channel between the plurality of candidate terminal devices is least correlated.
  • a known algorithm such as a zero forcing algorithm can be used to determine the first precoding matrix.
  • the first reference signal is first precoded with the first precoding matrix.
  • the first reference signal may correspond, for example, to the reference signal in step S3002 of FIG. 3, and the first pre-coded first reference signal may correspond to the PC-RS in FIG.
  • Step S7002 may correspond, for example, to step S3002 in FIG.
  • step S7004 the first precoded first reference signal is transmitted to a plurality of candidate terminal devices.
  • Step S7004 may correspond, for example, to step S3004 in FIG.
  • each of the plurality of candidate terminal devices is more The candidate terminal devices perform scheduling, wherein the information fed back by each terminal device indicates interference of other terminal devices of the plurality of candidate terminal devices with the terminal device.
  • Step S7006 may correspond, for example, to step S3012 in FIG.
  • the information about the first precoding may include, for example, the number of candidate terminal devices, the information of the layer in which the first terminal device is located (for example, the number i of the terminal device i), and the like. As shown in [Equation 2] described with reference to FIG.
  • the information about the first pre-coding may further include information of a layer where the candidate terminal device other than the first terminal device (for example, the terminal device i) is located (for example, the number j of the terminal device j) to determine the terminal device j.
  • the information about the first precoding may further include a reference signal type indicator for indicating a type of the first reference signal, to determine that the first precoded first reference signal from the base station is used for measuring Interference between candidate terminal devices is also used to acquire legacy CSI.
  • the information about the first precoding may be sent by the base station to each terminal device, or may be default, preset, or estimated by the terminal device according to the measurement situation. This will be described in more detail later with reference to FIG. 8.
  • a plurality of candidate terminal devices are selected based on the condition of an active terminal device in a cell associated with the base station. For example, there are M active terminal devices in the cell, and the base station can be set from the M active terminals. K terminal devices are selected as candidate terminal devices, where K ⁇ M.
  • the scheduling of the plurality of candidate terminal devices by the base station may include: selecting one or more terminal devices to perform actual MU-MIMO data transmission from the plurality of candidate terminal devices.
  • the base station may select a combination of the best quality terminal devices for actual MU-MIMO data transmission from the plurality of candidate terminal devices based on the information indicating the interference fed back from the plurality of candidate terminal devices.
  • the base station may adjust a combination of terminal devices to perform actual MU-MIMO data transmission according to a bit pattern respectively fed back from each candidate terminal device, so that each terminal device in the combination of the selected terminal devices The channels after the second precoding are least correlated, thereby reducing interference between the respective terminal devices.
  • the scheduling of the plurality of candidate terminal devices by the base station may include determining a second precoding matrix for performing actual MU-MIMO transmission for the selected one or more terminal devices.
  • the base station may calculate a second precoding matrix for actual MU-MIMO data transmission according to channel direction information such as PMI/CRI of each terminal device in the selected combination of terminal devices.
  • the second precoding matrix is used to precode the data to be transmitted.
  • the scheduling of the plurality of candidate terminal devices by the base station may include: allocating suitable transmission resources (such as resource blocks and transmit power, etc.) to the selected one or more terminal devices.
  • the scheduling of the plurality of candidate terminal devices by the base station may include: determining a modulation and coding policy for the selected one or more terminal devices, for example, determining a modulation scheme of each of the selected one or more terminal devices, and Data transfer rate.
  • the communication method for the base station side of the wireless communication system may further include step S7008.
  • step S7008 the second reference signal is transmitted to a plurality of candidate terminal devices.
  • the plurality of candidate terminal devices feed back respective channel states to the base station based on the measurement results of the received second reference signal.
  • the second reference signal may for example be a CSI-RS in the prior art.
  • Step S7008 may correspond to step S2000 in FIG. 2, that is, the step of transmitting the CSI-RS in the prior art.
  • each terminal device determines interference of other terminal devices with the terminal device based on the result of the measurement of the first precoded first reference signal and the information about the first precoding.
  • the base station may transmit information about the first precoding to each candidate terminal device, such as by downlink control information (DCI).
  • DCI downlink control information
  • step S8003 shows a signaling diagram of an example of MU-MIMO scheduling in which information about first precoding is transmitted by a base station to each candidate terminal device, as shown in step S8003, in accordance with an embodiment of the present disclosure.
  • Other steps in Figure 8 The steps are the same as those in FIG. 3, and details are not described herein again.
  • the base station may transmit the number K of candidate terminal devices and the layer of the layer where the terminal device 1 is located to the terminal device 1, and send the number K of the candidate terminal devices and the terminal device K to the terminal device K. Information about the layer in which it is located.
  • the base station may further send information about the resource element carrying the PC-RS to each candidate terminal device to facilitate the measurement by the terminal device.
  • the base station may further send a reference signal type indicator for indicating the type of the reference signal to the terminal device.
  • the reference signal type indicator may be used to indicate whether the PC-CSI-RS is used to measure interference between the plurality of candidate terminal devices or Get traditional CSI.
  • 1-bit information may be added to the DCI on the downlink control channel as a reference signal type indicator, and the base station transmits a DCI including the reference signal indicator to a plurality of candidate terminal devices.
  • the reference signal indicator received by the candidate terminal device is 0, indicating that the observed PC-CSI-RS is used for legacy CSI acquisition, and if the reference signal indicator received by the candidate terminal device is 1, indicating the observed The PC-CSI-RS is used to measure interference between multiple terminal devices.
  • the base station may add 1 bit of information as a reference signal type indicator in the CSI field in DCI format (DCI format) 0/4.
  • the base station may use the existing CSI field in the current DCI format 0/4 to carry the reference signal type indicator. For example, in the case where the terminal device is configured with only one downlink cell, the CSI request field still uses 2 bits, and the second bit is used as the reference signal type indicator.
  • the CSI request field still uses 2 bits, and the second bit is used as the reference signal type indicator.
  • one or more of the information regarding the first pre-encoding may be preset.
  • the number of candidate terminal devices may be preset.
  • the base station selects a predetermined number of terminal devices as candidate terminal devices, and notifies each terminal device of the predetermined amount in advance.
  • the base station can configure the number of candidate terminal devices in advance by semi-static configuration.
  • the number of candidate terminal devices may be default or predetermined, without base station notification. This can reduce DCI overhead.
  • the information about the first precoding may be determined at the candidate terminal device side without the base station transmitting or pre-configuring.
  • the terminal device may determine a corresponding layer with the highest power in the received signal as the layer in which it is located, and determine the other layer as the layer in which the interference terminal device is located. This also reduces DCI overhead.
  • a first precoded first reference signal eg, PC-RS
  • a second reference e.g., PC-RS
  • FIGS. 9A to 9F, 10A to 10B, 11A to 11B, and 12A to 12B The case where a signal (such as CSI-RS) is occupied on a resource block.
  • 9A to 9F, 10A to 10B, 11A to 11B, and 12A to 12B are diagrams illustrating occupancy of a reference signal on a resource block, according to an embodiment of the present disclosure.
  • resource elements C0 to C3 correspond to CRS ports 0 to 3
  • resource elements D7 to D14 correspond to DMRS ports 7 to 14, respectively
  • resource elements R15 to R22 correspond to CSI-RS, respectively.
  • Ports 15-22, resource elements shown by diagonal hatching correspond to DCI areas, and resource elements shown by horizontal hatching correspond to other CSI-RS ports not used in the resource block.
  • the first precoded first reference signal is transmitted to each candidate terminal device by occupying a specific resource element on the resource block.
  • the first precoded first reference signal is carried by a resource element indicated by "x".
  • the first precoded first reference signal and the second reference signal may be carried by different resource elements.
  • the first precoded first reference signal is carried by 4 resource elements at positions indicated by "x" and transmitted to 4 candidate terminal devices, respectively, and the second reference signal is represented by resource element R15 ⁇ R22 (ie CSI-RS ports 15 ⁇ 22) to carry.
  • Figures 9B-9F illustrate examples of carrying the first precoded first reference signal and second reference signal by different resource elements. 9B-9F differ from FIG. 9A in that the locations of resource elements carrying the first precoded first reference signal are different.
  • the locations of the resource elements carrying the first precoded first reference signal illustrated in FIGS. 9A-9F may be fixed by a communication protocol.
  • the candidate terminal device can measure the first precoded first reference signal from the base station at the location of the resource element fixed by the communication protocol.
  • first precoded first reference signal and the second reference signal by different resource elements is not limited to the case illustrated in Figures 9A-9F.
  • the first precoded first reference signal and the second reference signal may be carried by the same resource element.
  • the first precoded first reference signal and second reference signal are carried by resource elements R15, R16, R19, R20.
  • the first precoded first reference signal and second reference signal are carried by resource elements R17, R18, R21, R22.
  • the second reference signal is transmitted periodically, and the first precoded first reference signal can be transmitted in the gap of the periodic transmission of the second reference signal.
  • the base station periodically transmits a second reference signal to the terminal device via resource elements R15, R16, R19, R20.
  • the first pre-coded first reference signal may be transmitted by the base station through the same resource elements R15, R16, R19, R20 in the gap of the periodic transmission of the second reference signal.
  • the transmission of the first precoded first reference signal can be triggered by the terminal device.
  • the base station may automatically terminate the transmission of the first precoded first reference signal when MU-MIMO scheduling is not required, or may notify the base station to terminate the transmission of the first precoded first reference signal by the terminal device.
  • the overhead of the resource element mapping design can be reduced, without changing the existing
  • the first precoded first reference signal is transmitted with the layout of the resource blocks.
  • the reference signal type indicator described above may be utilized to inform the terminal device to measure the first precoded first reference signal. For example, if the reference signal indicator received by the candidate terminal device is 0, it indicates that the observed first pre-coded first reference signal is used for traditional CSI acquisition, and the terminal device does not use the first pre-coded first. A reference signal performs multi-user interference measurement; and if the reference signal indicator received by the candidate terminal device is 1, indicating that the observed first pre-coded first reference signal is used to measure interference between multiple terminal devices At this time, the terminal device performs multi-user interference measurement on the first pre-coded first reference signal.
  • the reference signal type indicator is compared with the terminal device periodically performing multi-user interference measurement. To indicate whether the terminal device performs multi-user interference measurement can save signaling overhead.
  • the first precoded first reference signal may be transmitted to a plurality of candidate terminal devices by occupying the same resource element by a code division multiple access method.
  • the first pre-coded first reference signal may be code-multiplexed by an orthogonal code matrix, so that the first pre-coded first reference signals are orthogonal to each other, so that the resource blocks can be occupied. Same time frequency source.
  • the above embodiments may be exemplarily described mathematically for ease of understanding.
  • the first precoded first reference signal transmitted in the code division multiple access manner may be expressed as:
  • c i represents an orthogonal code corresponding to the terminal device i, which is a 1 ⁇ N vector
  • N is the chip length of the orthogonal code
  • the K orthogonal codes c 1 to c K are orthogonal to each other
  • n i represents the reception noise at the terminal device i, which is a 1 ⁇ N vector.
  • the definition of the other symbols in [Formula 3] is the same as [Formula 1].
  • the terminal device i processes the received signal using the orthogonal code matrix C,
  • the equivalent channel H effi can be estimated according to [Equation 4].
  • the equivalent channel can be estimated by a classical estimation method (such as a least squares method), which is not limited in the present invention.
  • the terminal device can determine the information indicating the interference by the same processing as that described above with reference to [Equation 2].
  • the first pre-coded first reference signal is referred to by PC-RS.
  • the orthogonal code matrix C is expressed as follows, wherein each of the orthogonal code matrices C is used for one candidate terminal device, and the orthogonal codes of each row are orthogonal to each other.
  • Such a code division multiple access method is also called a full code division multiple access (Full CDM) method.
  • each PC-RS occupies a plurality of resource elements and is transmitted to the candidate terminal device, for example, each of the PC-RSs shown in FIGS. 9A to 9F occupies one resource element.
  • the observation space is larger, and the statistical average effect is better, so that the influence of noise on the received signal can be reduced at the terminal device.
  • FIG. 11B illustrates the resource occupancy of another PC-RS in the full code division multiple access mode, which is different from FIG. 11A in that the location of the resource elements occupied by the PC-RS is different.
  • the resource occupancy of the PC-RS in the full code division multiple access mode is not limited to the case shown in FIGS. 11A to 11B.
  • first precoded first reference signal and the second reference signal according to the full code division multiple access method of the present disclosure may also be carried by the same resource element.
  • the base station may transmit the configuration information of the code division multiple access to the candidate terminal device.
  • the terminal device processes the measurement result by using the configuration information of the code division multiple access method acquired from the base station to determine interference of the other terminal device with the terminal device.
  • the configuration information of the code division multiple access may include codeword information of an orthogonal code.
  • candidate terminal devices are divided into two groups, each group including four candidate terminal devices. Mapping the four PC-RSs corresponding to the first group of candidate terminal devices to the four resource elements on the resource block by using the full code division multiple access method, and passing the four PC-RSs corresponding to the second group of candidate terminal devices through the full code.
  • the multiple access method maps to the other 4 resource elements on the resource block.
  • two sets of orthogonal codes for performing code division multiplexing may be the same as the orthogonal codes shown in FIGS. 11A to 11B.
  • Such a code division multiple access method is called a partial code division multiple access (Partial CDM) method.
  • FIG. 12B illustrates the resource occupancy of another partial code division multiple access mode of the PC-RS, which is different from that of FIG. 12A in that the location of the resource elements occupied by the PC-RS is different.
  • the resource occupancy of the PC-RS in the partial code division multiple access mode is not limited to the case shown in FIGS. 12A to 12B.
  • Those skilled in the art, under the teachings of the present disclosure, are able to perform similar designs according to actual application conditions, such as carrying a partial code division multiple access mode PC-RS with resource elements that are not occupied in resource blocks.
  • part of the code number according to the present disclosure may also be carried by the same resource element.
  • the first precoded first reference signal and the second reference signal of the address mode may also be carried by the same resource element.
  • the technology of the present disclosure can be applied to various products.
  • a base station can be implemented as any type of evolved Node B (eNB), such as a macro eNB and a small eNB.
  • 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.
  • base station 200 can be implemented as any other type of base station, such as a NodeB and a base transceiver station (BTS).
  • 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.
  • RRHs remote wireless headends
  • various types of terminals which will be described below, can operate as a base station by performing base station functions temporarily or semi-persistently.
  • the terminal device may be implemented as a mobile terminal (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 (such as a car navigation device). ).
  • the terminal device can also be implemented as a terminal (also referred to as a machine type communication (MTC) terminal) that performs machine-to-machine (M2M) communication.
  • MTC machine type communication
  • M2M machine-to-machine
  • the terminal device may be a wireless communication module (such as an integrated circuit module including a single wafer) installed on each of the above terminals.
  • FIG. 13 is a block diagram showing a first example of a schematic configuration of an eNB to which the technology of the present disclosure may be applied.
  • the eNB 800 includes one or more antennas 810 and a base station device 820.
  • the base station device 820 and each antenna 810 may be connected to each other via an RF cable.
  • Each of the antennas 810 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 apparatus 820 to transmit and receive wireless signals.
  • the eNB 800 can include multiple antennas 810.
  • multiple antennas 810 can be compatible with multiple frequency bands used by eNB 800.
  • FIG. 13 illustrates an example in which the eNB 800 includes multiple antennas 810, the eNB 800 may also include a single antenna 810.
  • the base station device 820 includes a controller 821, a memory 822, a network interface 823, and a wireless communication interface 825.
  • the controller 821 can be, for example, a CPU or a DSP, and operates various functions of higher layers of the base station device 820. For example, controller 821 generates data packets based on data in signals processed by wireless communication interface 825 and communicates the generated packets via network interface 823. Controller 821 can bundle data from multiple baseband processors to generate bundled packets and pass the generated bundled packets. The controller 821 can have logic functions that perform 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 822 includes a RAM and a ROM, and stores programs executed by the controller 821 and various types of control data such as a terminal list, transmission power data, and scheduling data.
  • Network interface 823 is a communication interface for connecting base station device 820 to core network 824. Controller 821 can communicate with a core network node or another eNB via network interface 823. In this case, the eNB 800 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. Network interface 823 can also be a wired communication interface or a wireless communication interface for wireless backhaul lines. If network interface 823 is a wireless communication interface, network interface 823 can use a higher frequency band for wireless communication than the frequency band used by wireless communication interface 825.
  • the wireless communication interface 825 supports any cellular communication scheme, such as Long Term Evolution (LTE) and LTE-Advanced, and provides a wireless connection to terminals located in cells of the eNB 800 via the antenna 810.
  • Wireless communication interface 825 may typically include, for example, a baseband (BB) processor 826 and RF circuitry 827.
  • the BB processor 826 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 826 may have some or all of the above described logic functions.
  • the BB processor 826 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 function of the BB processor 826 to change.
  • the module can be a card or blade that is inserted into a slot of the base station device 820. Alternatively, the module can also be a chip mounted on a card or blade.
  • the RF circuit 827 may include, for example, a mixer, a filter, and an amplifier, and transmits and receives a wireless signal via the antenna 810.
  • the wireless communication interface 825 can include a plurality of BB processors 826.
  • multiple BB processors 826 can be compatible with multiple frequency bands used by eNB 800.
  • the wireless communication interface 825 can include a plurality of RF circuits 827.
  • multiple RF circuits 827 can be compatible with multiple antenna elements.
  • FIG. 13 illustrates an example in which the wireless communication interface 825 includes a plurality of BB processors 826 and a plurality of RF circuits 827, the wireless communication interface 825 may also include a single BB processor 826 or a single RF circuit 827.
  • the eNB 830 includes one or more antennas 840, a base station device 850, and an RRH 860.
  • the RRH 860 and each antenna 840 may be connected to each other via an RF cable.
  • Base station device 850 and RRH 860 can be connected via a high speed such as a fiber optic cable Lines are connected to each other.
  • Each of the antennas 840 includes a single or multiple antenna elements (such as multiple antenna elements included in a MIMO antenna) and is used by the RRH 860 to transmit and receive wireless signals.
  • eNB 830 can include multiple antennas 840.
  • multiple antennas 840 may be compatible with multiple frequency bands used by eNB 830.
  • FIG. 14 illustrates an example in which the eNB 830 includes multiple antennas 840, the eNB 830 may also include a single antenna 840.
  • the base station device 850 includes a controller 851, a memory 852, a network interface 853, a wireless communication interface 855, and a connection interface 857.
  • the controller 851, the memory 852, and the network interface 853 are the same as the controller 821, the memory 822, and the network interface 823 described with reference to FIG.
  • the wireless communication interface 855 supports any cellular communication scheme (such as LTE and LTE-Advanced) and provides wireless communication to terminals located in sectors corresponding to the RRH 860 via the RRH 860 and the antenna 840.
  • Wireless communication interface 855 can generally include, for example, BB processor 856.
  • the BB processor 856 is identical to the BB processor 826 described with reference to FIG. 13 except that the BB processor 856 is connected to the RF circuit 864 of the RRH 860 via the connection interface 857.
  • the wireless communication interface 855 can include a plurality of BB processors 856.
  • multiple BB processors 856 can be compatible with multiple frequency bands used by eNB 830.
  • FIG. 14 illustrates an example in which the wireless communication interface 855 includes a plurality of BB processors 856, the wireless communication interface 855 can also include a single BB processor 856.
  • connection interface 857 is an interface for connecting the base station device 850 (wireless communication interface 855) to the RRH 860.
  • the connection interface 857 may also be a communication module for communicating the base station device 850 (wireless communication interface 855) to the above-described high speed line of the RRH 860.
  • the RRH 860 includes a connection interface 861 and a wireless communication interface 863.
  • connection interface 861 is an interface for connecting the RRH 860 (wireless communication interface 863) to the base station device 850.
  • the connection interface 861 can also be a communication module for communication in the above high speed line.
  • the wireless communication interface 863 transmits and receives wireless signals via the antenna 840.
  • Wireless communication interface 863 can typically include, for example, RF circuitry 864.
  • the RF circuit 864 can include, for example, a mixer, a filter, and an amplifier, and transmits and receives wireless signals via the antenna 840.
  • the wireless communication interface 863 can include a plurality of RF circuits 864.
  • multiple RF circuits 864 can support multiple antenna elements.
  • FIG. 14 illustrates an example in which the wireless communication interface 863 includes a plurality of RF circuits 864, the wireless communication interface 863 may also include a single RF circuit 864.
  • one or more components included in the processing circuit 6020 described with reference to FIG. 6 may be implemented in the wireless communication interface 912. Alternatively, at least a portion of these components can also be implemented by controller 821 and controller 851.
  • FIG. 15 is a block diagram showing an example of a schematic configuration of a smartphone 900 to which the technology of the present disclosure can be applied.
  • the smart phone 900 includes a processor 901, a memory 902, a storage device 903, an external connection interface 904, an imaging device 906, a sensor 907, a microphone 908, an input device 909, a display device 910, a speaker 911, a wireless communication interface 912, one or more An antenna switch 915, one or more antennas 916, a bus 917, a battery 918, and an auxiliary controller 919.
  • the processor 901 can 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 smart phone 900.
  • the memory 902 includes a RAM and a ROM, and stores data and programs executed by the processor 901.
  • the storage device 903 may include a storage medium such as a semiconductor memory and a hard disk.
  • the external connection interface 904 is an interface for connecting an external device such as a memory card and a universal serial bus (USB) device to the smartphone 900.
  • USB universal serial bus
  • the camera 906 includes an image sensor such as a charge coupled device (CCD) and a complementary metal oxide semiconductor (CMOS), and generates a captured image.
  • Sensor 907 can include a set of sensors, such as measurement sensors, gyro sensors, geomagnetic sensors, and acceleration sensors.
  • the microphone 908 converts the sound input to the smartphone 900 into an audio signal.
  • the input device 909 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 910, and receives an operation or information input from a user.
  • the display device 910 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 900.
  • the speaker 911 converts the audio signal output from the smartphone 900 into sound.
  • the wireless communication interface 912 supports any cellular communication scheme (such as LTE and LTE-Advanced) and performs wireless communication.
  • Wireless communication interface 912 may generally include, for example, BB processor 913 and RF circuitry 914.
  • the BB processor 913 can perform, for example, encoding/decoding, modulation/demodulation, and multiplexing/demultiplexing, and performs various types of signal processing for wireless communication.
  • RF circuitry 914 may include, for example, mixers, filters, and amplifiers, and transmit and receive wireless signals via antenna 916.
  • the wireless communication interface 912 can be a chip module on which the BB processor 913 and the RF circuit 914 are integrated. As shown in FIG.
  • the wireless communication interface 912 can include a plurality of BB processors 913 and a plurality of RF circuits 914.
  • FIG. 15 illustrates an example in which the wireless communication interface 912 includes a plurality of BB processors 913 and a plurality of RF circuits 914, the wireless communication interface 912 may also include a single BB processor 913 or a single RF circuit 914.
  • wireless communication interface 912 can 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 912 can include a BB processor 913 and RF circuitry 914 for each wireless communication scheme.
  • Each of the antenna switches 915 switches the connection destination of the antenna 916 between a plurality of circuits included in the wireless communication interface 912, such as circuits for different wireless communication schemes.
  • Each of the antennas 916 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 912 to transmit and receive wireless signals.
  • smart phone 900 can include multiple antennas 916.
  • FIG. 15 illustrates an example in which the smartphone 900 includes a plurality of antennas 916, the smartphone 900 may also include a single antenna 916.
  • smart phone 900 can include an antenna 916 for each wireless communication scheme.
  • the antenna switch 915 can be omitted from the configuration of the smartphone 900.
  • the bus 917 sets the processor 901, the memory 902, the storage device 903, the external connection interface 904, the camera 906, the sensor 907, the microphone 908, the input device 909, the display device 910, the speaker 911, the wireless communication interface 912, and the auxiliary controller 919 to each other. connection.
  • Battery 918 provides power to various blocks of smart phone 900 shown in FIG. 15 via a feeder, which is partially shown as a dashed line in the figure.
  • the auxiliary controller 919 operates the minimum necessary function of the smartphone 900, for example, in a sleep mode.
  • one or more components included in the processing circuit 4020 described with reference to FIG. 4 may be implemented in the wireless communication interface 912. Alternatively, at least some of these components may also be implemented by processor 901 or auxiliary controller 919.
  • FIG. 16 is a block diagram showing an example of a schematic configuration of a car navigation device 920 to which the technology of the present disclosure can be applied.
  • the car navigation device 920 includes a processor 921, a memory 922, a global positioning system (GPS) module 924, a sensor 925, a data interface 926, a content player 927, a storage medium interface 928, an input device 929, a display device 930, a speaker 931, and a wireless device.
  • the processor 921 can be, for example, a CPU or SoC and controls the navigation functions and additional functions of the car navigation device 920.
  • the memory 922 includes a RAM and a ROM, and stores data and programs executed by the processor 921.
  • the GPS module 924 measures the position of the car navigation device 920 (such as latitude, longitude, and altitude) using GPS signals received from GPS satellites.
  • Sensor 925 can include a set of sensors, such as a gyro sensor, a geomagnetic sensor, and an air pressure sensor.
  • the data interface 926 is connected to, for example, the in-vehicle network 941 via a terminal not shown, and acquires data (such as vehicle speed data) generated by the vehicle.
  • the content player 927 reproduces content stored in a storage medium such as a CD and a DVD, which is inserted into the storage medium interface 928.
  • the input device 929 includes, for example, a touch sensor, a button or a switch configured to detect a touch on the screen of the display device 930, and receives an operation or information input from a user.
  • the display device 930 includes a screen such as an LCD or OLED display, and displays an image of the navigation function or reproduced content.
  • the speaker 931 outputs the sound of the navigation function or the reproduced content.
  • the wireless communication interface 933 supports any cellular communication scheme (such as LTE and LTE-Advanced) and performs wireless communication.
  • Wireless communication interface 933 may typically include, for example, BB processor 934 and RF circuitry 935.
  • the BB processor 934 can perform, for example, encoding/decoding, modulation/demodulation, and multiplexing/demultiplexing, and performs various types of signal processing for wireless communication.
  • the RF circuit 935 may include, for example, a mixer, a filter, and an amplifier, and transmits and receives a wireless signal via the antenna 937.
  • the wireless communication interface 933 can also be a chip module on which the BB processor 934 and the RF circuit 935 are integrated. As shown in FIG.
  • the wireless communication interface 933 may include a plurality of BB processors 934 and a plurality of RF circuits 935.
  • FIG. 16 shows an example in which the wireless communication interface 933 includes a plurality of BB processors 934 and a plurality of RF circuits 935, the wireless communication interface 933 may also include a single BB processor 934 or a single RF circuit 935.
  • the wireless communication interface 933 can support another type of wireless communication scheme, such as a short-range wireless communication scheme, a near-field communication scheme, and a wireless LAN scheme.
  • the wireless communication interface 933 may include a BB processor 934 and an RF circuit 935 for each wireless communication scheme.
  • Each of the antenna switches 936 switches the connection destination of the antenna 937 between a plurality of circuits included in the wireless communication interface 933, such as circuits for different wireless communication schemes.
  • Each of the antennas 937 includes a single or multiple antenna elements (such as multiple antenna elements included in a MIMO antenna) and is used for the wireless communication interface 933 to transmit and receive wireless signals.
  • car navigation device 920 can include a plurality of antennas 937.
  • FIG. 16 shows an example in which the car navigation device 920 includes a plurality of antennas 937, the car navigation device 920 may also include a single antenna 937.
  • car navigation device 920 can include an antenna 937 for each wireless communication scheme.
  • the antenna switch 936 can be omitted from the configuration of the car navigation device 920.
  • Battery 938 provides power to various blocks of car navigation device 920 shown in Figure 16 via feeders, which are partially shown as dashed lines in the figure. Battery 938 accumulates power supplied from the vehicle.
  • one or more components included in the processing circuit 4020 described with reference to FIG. 4 may be implemented in the wireless communication interface 912. Alternatively, at least some of these components may also be implemented by processor 921.
  • the technology of the present disclosure may also be implemented as an onboard system (or vehicle) 940 that includes one or more of the car navigation device 920, the in-vehicle network 941, and the vehicle module 942.
  • vehicle module 942 generates vehicle data such as vehicle speed, engine speed, and fault information, and outputs the generated data to the in-vehicle network 941.
  • the present disclosure is embodied as a system, apparatus, method, or computer readable medium as a computer program product. Accordingly, the present disclosure may be embodied in various forms, such as a complete hardware embodiment, a complete software embodiment (including firmware, resident software, microprogram code, etc.), or as an implementation of software and hardware, The following will be referred to as "circuit,” “module,” or “system.” Furthermore, the present disclosure may also be embodied in any tangible media form as a computer program product having computer usable program code stored thereon.
  • each block of the flowchart or block diagram can represent a module, a segment, or a portion of program code that comprises one or more executable instructions to implement the specified logical function.
  • the functions described in the blocks may not be performed in the order illustrated.
  • the blocks in which the two figures are connected may in fact be executed simultaneously, or in some cases, in the reverse order of the icons, depending on the function involved.
  • blocks of each block diagram and/or flowchart, and combinations of blocks in the block diagrams and/or flowcharts can be implemented by a system based on a dedicated hardware, or by a combination of dedicated hardware and computer instructions. To perform specific functions or operations.

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Abstract

本公开涉及电子设备和通信方法。用于无线通信系统的第一终端设备侧的电子设备包括：存储器，用于存储计算机指令；以及处理电路，被配置为执行所存储的计算机指令以用于：测量来自基站的经第一预编码的第一参考信号，其中用于所述第一预编码的第一预编码矩阵是基站根据从多个候选终端设备反馈的各自的信道状态而确定的，其中所述多个候选终端设备包括第一终端设备；基于所述测量的结果以及关于所述第一预编码的信息，确定所述多个候选终端设备中的其它终端设备对第一终端设备的干扰；以及将指示所述干扰的信息反馈给基站。

Description

电子设备和通信方法
相关申请的交叉引用
本申请要求于2016年11月25日递交的中国专利申请第201611054719.9号的优先权，在此全文引用上述中国专利申请公开的内容以作为本申请的一部分。
技术领域
本公开涉及电子设备和通信方法，更具体地，本公开涉及多用户多输入多输出(Multi-User Multi-Input Multi-Output,MU-MIMO)系统中的电子设备和通信方法。
背景技术
在3GPP(3rd Generation Partnership Project，第三代合作伙伴计划)的长期演进(LTE)系统中，可以利用MU-MIMO技术来提升LTE系统的系统容量，以满足不断增长的业务量需求。
在MU-MIMO调度过程中，将不同天线的时频资源分配给多个用户设备(UE)(也可称为终端设备)，使得多个UE能够在空间上共享时频资源，从而增加在相同的时频资源上可以调度的UE的数量，以提高整体的调度效率。
为了实现MU-MIMO调度，基站需要从多个UE收集各个UE对本小区参考信号及邻小区参考信号进行测量并计算得到的信道质量信息(CQI)，并基于所收集的CQI通过例如链路自适应技术来模拟计算不同用户组合进行MU-MIMO传输时的信干噪比，以确定要采用哪些UE进行实际的MU-MIMO传输以及/或者对每个UE施用哪种调制编码策略(MCS)。
如上所述，在现有技术中，CQI是反映在单用户MIMO(Single User MIMO,SU-MIMO)状态下的UE信道质量的指标，也就是说现有技术目前仅支持在一个小区内调度单个UE情况下的CQI，而不是调度多个UE情况下的CQI。因而，基站从每个UE分别收集的CQI不能反映真实MU-MIMO状态下其它UE对该UE造成的干扰，使得基站无法获知MU-MIMO状态下的实际信道状态。因此，在现有的MU-MIMO系统中，基站难以进行精确的MU-MIMO调度。
发明内容
在下文中给出了关于本公开的简要概述，以便提供关于本公开的一些方面的基本理解。但是，应当理解，这个概述并不是关于本公开的穷举性概述。它并不是意图用来确定本公开的关键性部分或重要部分，也不是意图用来限定本公开的范围。其目的仅仅是以简化的形式给出关于本公开的某些概念，以此作为稍后给出的更详细描述的前序。
根据本公开的一个方面，提供了一种用于无线通信系统的第一终端设备侧的电子设备。该电子设备可以包括：存储器，用于存储计算机指令；以及处理电路，被配置为执行所存储的计算机指令以用于：测量来自基站的经第一预编码的第一参考信号，其中用于所述第一预编码的第一预编码矩阵是基站根据从多个候选终端设备反馈的各自的信道状态而确定的，其中所述多个候选终端设备包括第一终端设备；基于所述测量的结果以及关于所述第一预编码的信息，确定所述多个候选终端设备中的其它终端设备对第一终端设备的干扰；以及将指示所述干扰的信息反馈给基站。
根据本公开的另一方面，提供了一种用于无线通信系统的基站侧的电子设备。该电子设备可以包括：存储器，用于存储计算机指令；以及处理电路，被配置为执行所存储的计算机指令以用于：根据从多个候选终端设备反馈的各自的信道状态，确定用于所述多个候选终端设备的第一预编码矩阵；用所述第一预编码矩阵对第一参考信号进行第一预编码；将经所述第一预编码的第一参考信号发送到所述多个候选终端设备；以及根据所述多个候选终端设备中的每个终端设备基于对接收到的经所述第一预编码的第一参考信号的测量结果以及关于所述第一预编码的信息而反馈的信息，对所述多个候选终端设备进行调度，其中每个终端设备反馈的信息指示所述多个候选终端设备中的其它终端设备对该终端设备的干扰。
根据本公开的又一方面，提供了一种用于无线通信系统的通信方法。该方法可以包括：第一终端设备测量来自基站的经第一预编码的第一参考信号，其中用于所述第一预编码的第一预编码矩阵是基站根据从多个候选终端设备反馈的各自的信道状态而确定的，其中所述多个候选终端设备包括第一终端设备；第一终端设备基于所述测量的结果以及关于所述第一预编码的信息，确定所述多个候选终端设备中的其它终端设备对第一终端设备的干扰；以及第一终端设备将指示所述干扰的信息反馈给基站。
根据本公开的又一方面，提供了一种用于无线通信系统的通信方法。该方法可以包括：基站根据从多个候选终端设备反馈的各自的信道状态，确定用于所述多个候选终端设备的第一预编码矩阵；基站用所述第一预编码矩阵对第一参考信号进行第一预编码；基站将经所述第一预编码的第一参考信号发送到所述多个终端设备；以及基站根据所述多个终端设备中的每个终端设备基于对接收到的经所述第一预编码的第一参考信号的测量结果以 及关于所述第一预编码的信息而反馈的信息，对所述多个候选终端设备进行调度，其中每个终端设备反馈的信息指示所述多个候选终端设备中的其它终端设备对该终端设备的干扰。
根据本公开的又一方面，提供了一种计算机可读存储介质，包括可执行指令，当所述可执行指令由信息处理装置执行时，使所述信息处理装置执行根据本公开的通信方法。
根据本公开的一个或多个实施例，能够获得更准确地反映小区内的多个终端设备之间的干扰的信息，有助于进行更精确的MU-MIMO调度。
附图说明
构成说明书的一部分的附图描述了本公开的实施例，并且连同说明书一起用于解释本公开的原理。
参照附图，根据下面的详细描述，可以更清楚地理解本公开，其中：
图1是示出MU-MIMO系统的示意图；
图2是示出现有技术中进行MU-MIMO调度的信令图；
图3是示出根据本公开的一个实施例的进行MU-MIMO调度的信令图；
图4是示出根据本公开的实施例的用于无线通信系统的第一终端设备侧的电子设备的功能配置框图；
图5是示出根据本公开的实施例的用于无线通信系统的第一终端设备侧的通信方法的流程图；
图6是示出根据本公开的实施例的用于无线通信系统的基站侧的电子设备的功能配置框图；
图7是示出根据本公开的实施例的用于无线通信系统的基站侧的通信方法的流程图；
图8是示出根据本公开的一个实施例的进行MU-MIMO调度的信令图；
图9A～9F是示出根据本公开的一个实施例的参考信号在资源块上的占用情况的示意图；
图10A～10B是示出根据本公开的另一个实施例的参考信号在资源块上的占用情况的示意图；
图11A～11B是示出根据本公开的另一个实施例的参考信号在资源块上的占用情况的示意图；
图12A～12B是示出根据本公开的另一个实施例的参考信号在资源块上的占用情况的示意图；
图13是示出根据本公开的实施例的eNB的示意性配置的第一示例的框图；
图14是示出根据本公开的实施例的eNB的示意性配置的第二示例的框图；
图15是示出根据本公开的实施例的智能电话的示意性配置的示例的框图；以及
图16是示出根据本公开的实施例的汽车导航设备的示意性配置的示例的框图。
具体实施方式
现在将参照附图来详细描述本公开的各种示例性实施例。应注意到：除非另外具体说明，否则在这些实施例中阐述的部件和步骤的相对布置、数字表达式和数值不限制本公开的范围。
同时，应当明白，为了便于描述，附图中所示出的各个部分的尺寸并不是按照实际的比例关系绘制的。
以下对至少一个示例性实施例的描述实际上仅仅是说明性的，决不作为对本公开及其应用或使用的任何限制。
对于相关领域普通技术人员已知的技术、方法和设备可能不作详细讨论，但在适当情况下，所述技术、方法和设备应当被视为说明书的一部分。
在这里示出和讨论的所有示例中，任何具体值应被解释为仅仅是示例性的，而不是作为限制。因此，示例性实施例的其它示例可以具有不同的值。
应注意到：相似的标号和字母在下面的附图中表示类似项，因此，一旦某一项在一个附图中被定义，则在随后的附图中不需要对其进行进一步讨论。
为便于更好地理解根据本公开的技术方案，下面简单介绍一些本公开所使用的概念。
基站例如演进型节点B(eNB)具有支持MIMO技术的多个天线。MIMO技术的使用使得基站能够利用空域来支持空间复用、波束赋形和发射分集。空间复用可被用于在相同频率上同时传送不同的数据流。这些数据流可被传送给单个UE以提高数据率(可归为SU-MIMO技术)或传送给多个UE以增加系统总容量(可归为MU-MIMO技术)。这是藉由对每一数据流进行空间预编码(即，应用振幅的比例缩放和相位调整)并且随后通过多个发射天线在下行链路(DL)上传送每一经空间预编码的流来达成的。经空间预编码 的数据流带有不同空间签名地抵达(诸)UE处，这使得(诸)UE中每个UE能够恢复以该UE为目的地的一个或多个数据流。在上行链路(UL)上，每个UE传送经空间预编码的数据流，这使得基站能够标识每个经空间预编码的数据流的源。
空间复用一般在信道状况良好时使用。在信道状况不那么有利时，可使用波束赋形来将发射能量集中在一个或多个方向上。这可以通过对数据进行空间预编码以供通过多个天线传输来达成。为了在蜂窝小区边缘处达成良好覆盖，单流波束赋形传输可结合发射分集来使用。
在以下详细描述中，将参照在DL上支持正交频分复用(OFDM)的MIMO系统来描述接入网的各种方面。OFDM是将数据调制到OFDM码元内的数个副载波上的扩频技术。这些副载波以精确频率分隔开。该分隔提供使得接收机能够从这些副载波恢复数据的“正交性”。在时域中，可向每个OFDM码元添加保护区间(例如，循环前缀)以对抗OFDM码元间干扰。UL可以使用经离散傅里叶变换(DFT)扩展的OFDM信号形式的单载波频分多址(SC-FDMA)来补偿高峰均功率比(PAPR)。
接下来解说LTE中用于用户面和控制面的无线电协议架构。用于UE和eNB的无线电协议架构被示为具有三层：层1、层2和层3。层1(L1层)是最低层并实现各种物理层信号处理功能。L1层将在本文中被称为物理层。层2(L2层)在物理层之上并且负责UE与eNB之间在物理层之上的链路。
在用户面中，L2层包括媒体接入控制(MAC)子层、无线电链路控制(RLC)子层、以及分组数据汇聚协议(PDCP)子层，它们在网络侧上终接于eNB处。UE在L2层之上还可具有若干个上层，包括在网络侧终接于PDN网关处的网络层(例如，IP层)、以及终接于连接的另一端(例如，远端UE、服务器等)的应用层。
PDCP子层提供不同无线电承载与逻辑信道之间的复用。PDCP子层还提供对上层数据分组的报头压缩以减少无线电传输开销，通过将数据分组暗码化来提供安全性，以及提供对UE在各eNB之间的切换支持。RLC子层提供对上层数据分组的分段和重装、对丢失数据分组的重传、以及对数据分组的重排序以补偿因混合自动重传请求(HARQ)而引起的脱序接收。MAC子层提供逻辑信道与传输信道之间的复用。MAC子层还负责在各UE间分配一个蜂窝小区中的各种无线电资源(例如，资源块)。MAC子层还负责HARQ操作。
在控制面中，用于UE和eNB的无线电协议架构对于物理层和L2层而言基本相同，区别在于对控制面而言没有头部压缩功能。控制面还包括层3(L3层)中的无线电资源控制(RRC)子层。RRC子层负责获得无线电资源(即，无线电承载)以及负责使用eNB与UE之间的RRC信令来配置各下层。
简要介绍基站侧实现L1层(即，物理层)的各种信号处理功能。这些信号处理功能包括编码和交织以促成UE的前向纠错(FEC)以及基于各种调制方案(例如，二进制相移键控(BPSK)、正交相移键控(QPSK)、M相移键控(M-PSK)、M正交振幅调制(M-QAM))向信号星座进行的映射。随后，经编码和调制的码元被拆分成并行流。每个流随后被映射到OFDM副载波、在时域和/或频域中与参考信号(例如，导频)复用、并且随后使用快速傅里叶逆变换(IFFT)组合到一起以产生携带时域OFDM码元流的物理信道。该OFDM流被空间预编码以产生多个空间流。信道估计可被用来确定编码和调制方案以及用于空间处理。该信道估计可以从由UE传送的参考信号和/或信道状况反馈推导出来。每个空间流随后经由分开的发射机被提供给不同的天线。每个发射机用各自的空间流来调制RF载波以供传输。
在UE处，每个接收机通过其各自相应的天线来接收信号。每个接收机恢复出调制到射频(RF)载波上的信息并将该信息提供给L1层的各种信号处理功能。在L1层对该信息执行空间处理以恢复出以UE为目的地的任何空间流。如果有多个空间流以UE为目的地，那么它们可被组合成单个OFDM码元流。随后使用快速傅里叶变换(FFT)将该OFDM码元流从时域转换到频域。该频域信号对该OFDM信号的每个副载波包括单独的OFDM码元流。通过确定最有可能由eNB传送了的信号星座点来恢复和解调每个副载波上的码元、以及参考信号。这些软判决可以基于信道估计。这些软判决随后被解码和解交织以恢复出原始由eNB在物理信道上传送的数据和控制信号。这些数据和控制信号随后被提供给更高层处理。
下面介绍一些与下行参考信号和信道状态信息有关的术语。
下行参考信号
下行参考信号是在下行时频资源块(RB)中占用特定的资源元素(RE)的预先定义的信号。在LTE下行链路中，包括如下几种不同类型的参考信号：
小区专用参考信号(CRS)：通常指共用的参考信号，小区中所有UE都可以使用。
解调参考信号(DMRS)：针对专门用户，嵌入在数据中。
信道状态信息参考信号(CSI-RS):用于估计信道状态信息，从而辅助基站的资源调度、预编码工作。
信道状态信息(CSI)
信道状态信息用来指示基站与UE之间的信道的信道状态。信道状态信息可以包括秩指示符(RI)、预编码矩阵指示符(PMI)和信道质量指示符(CQI)。
RI是关于信道秩的信息，信道秩指示可以在相同的时频资源中承载不同的信息的层的最大数目。
PMI用于指示基站与UE之间共享的包括多个预编码矩阵的码本中的特定的预编码矩阵的索引。
CQI指示信道质量，可以用来帮助确定对应的调制方案和编码速率。
此外，CRI(CSI-RS资源指示符)用于指示偏好的CSI-RS资源，UE测量每一CSI-RS资源并以CRI的形式反馈推荐的波束。
接下来简单介绍全维度MIMO(FD-MIMO)技术。
FD-MIMO技术可通过在eNB处使用具有例如高达64个天线端口的二维天线阵列来极大地改善系统容量。在eNB处使用多个天线端口的益处可包括小的蜂窝小区间干扰以及高波束赋形增益。使用二维天线阵列允许在水平和垂直方向两者上进行因UE而异的波束赋形。
在FD-MIMO系统中，与传统的8天线MIMO系统相比，eNB处的发射天线的数目可被增加例如8到10倍。这些额外发射天线可带来更大的波束赋形增益并向邻蜂窝小区引入较少的干扰。
具有一维天线阵列的传统MIMO技术中，因UE而异的波束赋形可仅在水平方向上被执行。共用垂直下倾角可被应用于多个UE。
具有二维天线阵列的FD-MIMO技术中，因UE而异的波束赋形可在水平方向和垂直方向两者上被执行。
在传统线性预编码中，eNB需要关于全信道的MIMO信道状态信息(CSI)。例如，传统的波束赋形/预编码方法依赖于整个发射维度的CSI的可用性(例如，需要从每个eNB发射天线到一个或多个UE接收天线的信道的瞬时/统计知识)。
此种CSI或由UE PMI/RI反馈或通过利用信道互易性来获得。在TDD(时分双工)系统中，CSI主要在eNB处通过利用双向信道互易性来获取。在FDD(频分双工)系统中，CSI通常在UE处被测量和量化并且随后经由专用上行链路信道反馈给eNB。一般来说，用于CSI量化的码本的大小随eNB处的发射天线的数目增加而增加。
UE的PMI/RI报告可以基于DL全信道的导频辅助式估计。导频(或共用参考信号)开销和DL信道估计复杂性可与eNB天线的数目成比例。因此，PMI/RI选择的复杂性可随eNB天线的数目增加而增加。
如上所述，传统的信道估计和信道信息反馈因增大的发射天线数目而成问题。因此，在已知的一些技术讨论中提出如下的两级信道信息反馈的方法：eNB先利用预设的多个CSI-RS资源发射小区共用的多个CSI-RS波束以供UE测量，之后从UE获得其测得的长期的/粗略的CSI，然后根据长期的/粗略的CSI将较大数目的天线压缩到较小数目的天线端口。UE在较小数目的天线端口而非较大数目的天线上测量短期CSI。UE可以量化短 期CSI并将其反馈给eNB。eNB可以使用经量化的短期CSI来将多个数据层映射至因UE而异的天线端口(例如，使用层预编码器)，从而降低信道估计的复杂度及CSI反馈开销。下面结合图1简单介绍MU-MIMO系统。如图1所示，MU-MIMO系统1000包括基站1002及多个终端设备1006、1008、1010和1012。基站1002及多个终端设备1006、1008、1010和1012位于小区1004内。
应当理解，本公开说明书中所描述的基站可以被实现为任何类型的eNB或其它类型的基站等(参见后述“关于基站的应用示例”)；本公开的说明书中所描述的终端设备可以被实现为移动终端或车载终端等(参见后述“关于终端设备的应用示例”)，以下有时也将终端设备称为UE。
如上所述地，在MU-MIMO系统1000中，基站1002可以在相同的时频资源块(RB)上同时调度多个终端设备，以实现多个终端设备的调制符号流在相同时频资源上的空分复用。例如，如图1所示，终端设备1006、1008、1010和1012可以在相同的时频资源以及不同的空间(如图1中的四个“波束”所示)上被共同调度。另外，由于终端设备1006、1008、1010占用相同的时频资源，并且彼此的空间距离相对较近或者各个终端设备与基站间的信道彼此相关度较高，因此在数据传输的过程中会在彼此之间产生干扰。
在进行MU-MIMO数据传输时，基站1002基于参与多用户传输的各个终端设备(例如终端设备1006、1008、1010和1012)的信道状态计算预编码矩阵并采用相应的波束赋形方案来发送数据信号，使得不同的终端设备对应于不同的空间波束，如图1所示的。然而，在传统的MU-MIMO系统中，基站根据当前服务的用户各自上报的CSI(包括CQI及PMI)来计算多种MU-MIMO的用户组合下的MU-CQI以确定其MU-MIMO用户选择以及/或者各用户的传输编码方案，从而缺少机制支持与实际MU-MIMO数据传输相符的信道状态测量。
下面参照图2来描述现有技术中进行MU-MIMO调度的信令图。
图2中所示的基站可以对应于图1所示的基站1002，图2中所示的终端设备可以对应于图1中所示的终端设备1006、1008、1010和1012中的任一个。
如图2所示，在步骤S2000中，基站向终端设备发送CSI-RS，以用于估计下行信道状态。
在步骤S2002中，终端设备对接收到的CSI-RS进行测量，以确定信道状态。得到的信道状态信息(CSI)可以包括RI、PMI和CQI。在现有的LTE系统中，在计算CQI时，假设本小区在相同的时频资源上仅有一个终端设备被调度，因此，该CQI仅指示在小区内调度单个终端设备情况下的信道质量(即CQISU)，而不能反映处于同一小区中的 其它终端设备对该终端设备的干扰。
在步骤S2004中，终端设备向基站反馈信道状态信息，包括RI、PMI和CQISU。
为了进行MU-MIMO调度，在步骤S2006中，基站将CQISU调整为与小区中的其它终端设备的干扰有关的多用户CQI，即CQIMU。例如，基站可以根据链路自适应技术等将所接收到的CQISU调整为CQIMU。
在步骤S2008中，基站利用CQIMU对小区中的多个终端设备进行MU-MIMO调度。
然而，现有技术中将CQISU调整为CQIMU的技术存在调整不准确的问题，从而可能会影响MU-MIMO调度的性能。
本发明提出了一种方法，可以获得更准确地反映小区内的多个终端设备之间的干扰的信息，有助于进行更精确的MU-MIMO调度。
下面将参照图3描述根据本公开的一个实施例的MU-MIMO调度的信令图。
图3所示的MU-MIMO调度例如可以应用于图1所示的MU-MIMO系统1000中。另外，图3中所示的基站可以对应于图1所示的基站1002，图3中所示的K个候选终端设备(终端设备1、…、终端设备K，其中K为自然数)可以对应于图1中所示的终端设备1006、1008、1010和1012中的一个或多个，也可以更多。
在一个实施例中，基站根据小区中的活跃终端设备的情况来选择要进行MU-MIMO调度的候选终端设备。具体地，在一个示例中，基站根据下行传输缓冲器中的待传输的下行数据的目的终端设备，从小区中的活跃终端设备中选择K个目的终端设备作为候选终端设备。在另一个示例中，基站基于小区中的活跃终端设备反馈的信道状态，例如PMI或CRI，确定彼此间信道相关度较小的终端设备作为候选终端设备。具体地，基站接收多个活跃终端设备分别反馈的CRI，以初步判断哪些终端设备适合作为MU-MIMO的用户组合，哪些不适合。例如，如果两个终端设备上报的CRI相同或者指示空间上比较接近的波束时，则可以粗略地认为这两个终端设备的空间隔离度较差，不适合作为MU-MIMO的用户组合；反之，则认为这两个终端设备适合作为MU-MIMO的用户组合。这个过程可以有效地排除掉很多不适合的MU-MIMO用户组合，从而减小候选终端设备选择的复杂度，以及减少多用户干扰测量的负担。
假设基站根据小区中的活跃终端设备的情况选择出了K个终端设备作为进行MU-MIMO调度的候选终端设备。在步骤S3000中，基站根据从K个候选终端设备反馈的各自的信道状态，确定用于对该K个候选终端设备进行波束赋形的第一预编码矩阵。该第一预编码矩阵与在假设最终选择了上述K个候选终端设备进行MU-MIMO传输的情况下采用的针对数据的预编码矩阵相同。
在一个实施例中，第一预编码矩阵对K个候选终端设备进行部分维度(例如垂直维度或水平维度)波束赋形。在另一个实施例中，第一预编码矩阵对K个候选终端设备进行全维度波束赋形。
根据一个实施例，由K个候选终端设备反馈各自的信道状态可以采用图2所示的现有技术来实现，例如图2的步骤S2000、S2002和S2004所示的那样。从而，从每个候选终端设备反馈的信道状态包括RI、PMI和CQISU。
在步骤S3002中，基站用第一预编码矩阵对用于测量终端设备间干扰的参考信号进行第一预编码，得到经第一预编码的参考信号(Precoded-RS，简称PC-RS)。
在一个实施例中，用于测量终端设备间干扰的参考信号可以是专门的参考信号。在另一个实施例中，用于测量终端设备间干扰的参考信号可以利用现有的CSI-RS(例如目前标准中的Class B CSI)来实现，基站用第一预编码矩阵对CSI-RS进行第一预编码得到经第一预编码的CSI-RS(Precoded-CSI-RS，简称PC-CSI-RS)。在一个实施例中，基站可以向K个候选终端设备通知该PC-CSI-RS是用于测量终端设备间的干扰还是用于获取传统CSI。传统CSI例如可以包括RI、PMI和CQI，可以通过现有技术中对CSI-RS进行测量的方法来获取。
在步骤S3004中，基站向K个候选终端设备分别发送PC-RS。
在一个实施例中，在采用CSI-RS作为用于测量终端设备间干扰的参考信号的情况下，基站向K个候选终端设备发送的PC-RS可以是PC-CSI-RS。
在步骤S3006中，K个候选终端设备分别对PC-RS进行测量。由于PC-RS在传输之前经历了用于波束赋形的第一预编码，所以其测量结果反映出的信道状态更加接近于实际进行MU-MIMO数据传输时的信道状态。具体而言，每个终端设备对PC-RS的测量结果包含有来自其它终端设备的干扰。
在步骤S3008中，K个候选终端设备中的每个终端设备根据接收到的PC-RS的测量结果，确定其它K-1个终端设备对其造成的干扰。
在步骤S3010中，K个候选终端设备分别向基站反馈各自的指示干扰的信息。
在步骤S3012中，基站根据从K个候选终端设备反馈的指示干扰的信息进行MU-MIMO调度。为便于理解，可以用数学方式来示例性描述步骤S3002至S3008的过程。
例如，假设在基站侧配备有nt根发射天线，则第一预编码矩阵可以表示为一个nt×K维矩阵V＝[v1,…,vi,…,vK]，其中，vi为nt×1的向量，1≤i≤K。将步骤S3002中的参考信号设为信号s，则经第一预编码的参考信号PC-RS可以表示为Vs。
假设K个候选终端设备中的每一个都配备有一根接收天线，则基站到终端设备i的信道可以表示为一个1×nt的向量Hi，其中1≤i≤K。在步骤S3006中，终端设备i处的接收信号可以表示为：
[式1]
Figure PCTCN2017106996-appb-000001
其中ni表示终端设备i处的接收噪声，为1×K的向量，
Figure PCTCN2017106996-appb-000002
表示yi的转置，为1×K的向量。该接收信号
Figure PCTCN2017106996-appb-000003
表示终端设备i对PC-RS进行测量的结果。
[式1]中的HiV＝[Hiv1,…,Hivi,…,Hivk]包含了终端设备i的信道和其余K-1个终端设备对终端设备i的干扰信道。这里，将HiV表示为终端设备i的等效信道Heffi＝HiV，则Heffi为一个1×K的向量。那么，[式1]可以改写成：
[式2]
Figure PCTCN2017106996-appb-000004
终端设备i可以利用[式2]来对等效信道Heffi＝HiV进行估计。可以通过各种估计方法(例如最小二乘法)来估计等效信道Heffi，本发明对此不作限制。
在估计出的等效信道Heffi中，第i列的值，即Hivi，指示终端设备i的等效信道，而除了第i列以外的K-1列的值分别指示K个候选终端设备中的其它K-1个终端设备对终端设备i的等效干扰信道。因而，在步骤3008中，可以确定其它K-1个终端设备对终端设备i的干扰。
通过上述处理，终端设备i可以根据估计出的等效信道Heffi来确定指示干扰的信息。
根据一个实施例，终端设备i可以从等效信道Heffi中第i列的值确定终端设备i的接收信号强度Si，并可以从等效信道Heffi中第j列的值确定终端设备j对终端设备i的干扰值Ij，其中1≤j≤K且j≠i。
应当理解，上述的数学表示仅仅是为了方便描述而给出的示例而非限制，还可以采用别的方式来描述图3的实施例。
为简单起见，以上是以K个候选终端设备中的每一个都配备一根接收天线的情况作为示例来描述的。应当理解，对于终端设备具有多根接收天线的情况，处理方式是类似的。因此，在K个候选终端设备中包括配备有一根接收天线的终端设备和配备有多根接收天线的终端设备的情况下，基站也能够通过图3所示的方式从K个候选终端设备获得指示干扰的信息，从而进行MU-MIMO调度。后文中将参考图7来详细描述MU-MIMO调度。
从上面的描述可知，与图2所示的现有技术中的MU-MIMO调度不同，在图3所示 的根据本公开的一个实施例的MU-MIMO调度中，由于各终端设备向基站反馈的信息可以包括指示其它终端设备对该终端设备的干扰的信息，因此基站能够综合考虑各终端设备反馈的指示干扰的信息来进行精确的MU-MIMO调度。
下面参照图4和图5来说明根据本公开的实施例的用于无线通信系统的第一终端设备侧的电子设备及其通信方法。第一终端设备可以例如对应于图3中所示的K个候选终端设备中的任一个。
图4示出根据本公开的实施例的用于无线通信系统的第一终端设备侧的电子设备4000的功能配置框图。在一个实施例中，电子设备4000可以包括例如存储器4010处理电路4020。
电子设备4000的存储器4010可以存储由处理电路4020产生的信息以及用于电子设备4000操作的程序和数据。存储器4010可以是易失性存储器和/或非易失性存储器。例如，存储器4010可以包括但不限于随机存取存储器(RAM)、动态随机存取存储器(DRAM)、静态随机存取存储器(SRAM)、只读存储器(ROM)以及闪存存储器。
电子设备4000的处理电路4020提供电子设备4000的各种功能。在本公开的实施例中，电子设备4000的处理电路4020可以包括第一参考信号测量单元4021、干扰确定单元4022和信息反馈单元4023，分别被配置为执行后述图5中所示的用于无线通信系统的第一终端设备侧的电子设备的通信方法中的步骤S5000、S5002、S5004。
根据本公开的一个实施例，处理电路4020还可以包括第二参考信号测量单元4024和信道状态反馈单元4025，分别被配置为执行后述图5中所示的用于无线通信系统的第一终端设备侧的电子设备的通信方法中的步骤S5006、S5008。
处理电路4020可以指在计算系统中执行功能的数字电路系统、模拟电路系统或混合信号(模拟和数字的组合)电路系统的各种实现。处理元件可以包括例如诸如集成电路(IC)、专用集成电路(ASIC)这样的电路、单独处理器核心的部分或电路、整个处理器核心、单独的处理器、诸如现场可编程门阵列(FPGA)的可编程硬件设备、和/或包括多个处理器的系统。
另外，电子设备4000可以以芯片级来实现，或者也可以通过包括其它外部部件而以设备级来实现。在一个实施例中，电子设备4000可以作为整机而实现为第一终端设备，并且还可以包括一根或多根天线。
应当理解，上述各个单元仅是根据其所实现的具体功能所划分的逻辑功能模块，而不是用于限制具体的实现方式。在实际实现时，上述各个功能单元可被实现为独立的物理实体，或者也可由单个实体(例如，处理器(CPU或DSP等)、集成电路等)来实现。
图5示出根据本公开的实施例的用于无线通信系统的第一终端设备侧的通信方法的流程图。该通信方法例如可以用于如图4所示的电子设备4000。
如图5所示，在步骤S5000中，测量来自基站的经第一预编码的第一参考信号，其中用于第一预编码的第一预编码矩阵是基站根据从多个候选终端设备反馈的各自的信道状态而确定的，其中多个候选终端设备包括第一终端设备。根据本公开的一个实施例，第一参考信号可以例如对应于图3的步骤S3002中的参考信号，而经第一预编码的第一参考信号可以对应于图3中的PC-RS。步骤S5000可以例如对应于图3中的步骤S3006。
第一预编码矩阵可以用于对发送给多个候选终端设备的第一参考信号进行波束赋形。根据本公开的一个实施例，第一预编码矩阵的确定准则可以是使得多个候选终端设备间的第一预编码后的信道最不相关。例如可以采用迫零算法等已知算法来确定第一预编码矩阵。
在步骤S5002中，基于测量的结果以及关于第一预编码的信息，确定多个候选终端设备中的其它终端设备对第一终端设备的干扰。步骤S5002可以例如对应于图3中的步骤S3008。
关于第一预编码的信息可以用于帮助确定其它终端设备对第一终端设备的干扰。例如，关于第一预编码的信息可以包括候选终端设备的数量、第一终端设备所在的层的信息(表示时频资源块上用于向第一终端设备传输的层的编号，例如是终端设备i的编号i)等。如参考图3描述的[式2]所示出的，这些信息可以用于帮助估计等效信道Heffi。可选地，关于第一预编码的信息还可以包括第一终端设备(例如终端设备i)以外的其它候选终端设备所在的层的信息(例如终端设备j的编号j)，以确定终端设备j对终端设备i的干扰值。可选地，关于第一预编码的信息还可以包括用于指示第一参考信号的类型的参考信号类型指示符。例如，在利用CSI-RS作为第一参考信号的情况下，该参考信号类型指示符可以指示来自基站的经第一预编码的第一参考信号是用于测量多个候选终端设备间的干扰还是用于获取传统CSI。关于第一预编码的信息可以由基站发送给各个终端设备，也可以是默认的、预先设定或由终端设备自行根据测量情况估计的。后面将参照图8对此进行更详细的描述。在步骤S5004中，将指示干扰的信息反馈给基站。步骤S5004可以例如对应于图3中的步骤S3010。
根据本公开的一个实施例，经由图4所示的电子设备4000的天线从基站接收第一参考信号，并经由该天线将指示干扰的信息发送给基站。
根据本公开的一个实施例，指示干扰的信息可以包括指示多个候选终端设备中所有其他终端设备对第一终端设备的干扰的信息。例如，假设第一终端设备为终端设备i。终端设备i根据[式2]估计出的等效信道Heffi，将Heffi中除了第i列以外的K-1列的值或者量化以后的值作为指示干扰的信息而反馈给基站，基站可以根据从各候选终端设备反馈的该 指示干扰的信息来确定要进行实际MU-MIMO传输的终端设备的组合以及该终端设备的组合中的各终端设备的调制编码策略。
根据本公开的一个实施例，指示干扰的信息可以包括指示多个候选终端设备中对第一终端设备的干扰小于预定阈值的一个或多个终端设备的信息，基站可以根据从各候选终端设备反馈的该指示干扰的信息来确定要进行实际MU-MIMO传输的终端设备的组合。
例如，假设第一终端设备为终端设备i。根据[式2]估计出的等效信道Heffi求出的小于预定阈值的干扰值分别为终端设备m的干扰值Im和终端设备n的干扰值In(1≤m≤K，1≤n≤K)，则可以将终端设备m和终端设备n对应的层的信息m、n按照干扰值从小到大或者从大到小的顺序作为指示干扰的信息反馈给基站。由于仅反馈对应的层的信息而不反馈具体的干扰值，因此能够减小信令开销。
在一个实施例中，预定阈值可以在基站和第一终端设备之间预先设定。在另一个实施例中，预定阈值可以由基站预先对第一终端设备进行配置。另外，预定阈值可以根据信道条件的不同而变化。
根据本公开的一个实施例，指示干扰的信息可以包括指示多个候选终端设备中对第一终端设备的干扰小于预定阈值的一个或多个终端设备的信息以及相应的干扰值，基站可以根据从各候选终端设备反馈的该指示干扰的信息来确定要进行实际MU-MIMO传输的终端设备的组合以及该终端设备的组合中的各终端设备的调制编码策略。例如，指示干扰的信息除了包括终端设备m和终端设备n对应的层的信息m、n之外，还可以包括干扰值Im和干扰值In，或者干扰值Im和干扰值In之和Im+In。
根据本公开的一个实施例，指示干扰的信息可以包括指示多个候选终端设备中对第一终端设备的干扰小于预定阈值的一个或多个终端设备的信息以及关于所述一个或多个终端设备与第一终端设备进行MU-MIMO通信的信干噪比(SINR)的信息，基站可以根据从各候选终端设备反馈的该指示干扰的信息来确定要进行实际MU-MIMO传输的终端设备的组合以及该终端设备的组合中的各终端设备的调制编码策略。例如，终端设备m和n与终端设备i进行MU-MIMO通信的SINR可以基于终端设备m和n对终端设备i的干扰值Im和In以及终端设备i的接收信号强度Si来求出。在一个实施例中，关于SINR的信息可以是通过对SINR进行量化而得出的反映了其它终端设备的干扰的信道质量信息，即CQIMU。
根据本公开的一个实施例，指示干扰的信息可以包括指示多个候选终端设备中对第一终端设备的干扰最小的预定数目的终端设备的信息，基站可以根据从各候选终端设备反馈的该指示干扰的信息来确定要进行实际MU-MIMO传输的终端设备的组合。在一个实施例中，预定数目可以在基站和第一终端设备之间预先设定。在另一个实施例中，预定数 目可以由基站预先对第一终端设备进行配置。另外，预定数目可以根据信道条件的不同而变化。
在一个实施例中，可以通过比特图样(bitmap)来表示指示干扰的信息。例如，假设候选终端设备为[UE1,UE2,UE3,UE4]，其中UE1为第一终端设备，并假设预定数目为2。当UE1确定其他候选终端设备中对UE1的干扰最小的2个终端设备是UE2和UE4时，UE1可以将比特图样1101反馈给基站。该比特图样1101表示UE1推荐的进行MU-MIMO调度的终端设备是UE1、UE2和UE4。由于仅反馈对应的UE的信息而不反馈具体的干扰值，因此能够减小信令开销。
根据本公开的一个实施例，指示干扰的信息可以包括指示多个候选终端设备中对第一终端设备的干扰最小的预定数目的终端设备的信息以及相应的干扰值，基站可以根据从各候选终端设备反馈的该指示干扰的信息来确定要进行实际MU-MIMO传输的终端设备的组合以及该终端设备的组合中的各终端设备的调制编码策略。例如，指示干扰的信息除了包括指示对UE1干扰最小的UE2和UE4的信息以外，还可以包括UE2和UE4分别对UE1的干扰值I2和干扰值I4，或者干扰值I2和干扰值I4之和I2+I4。
根据本公开的一个实施例，指示干扰的信息可以包括指示多个候选终端设备中对第一终端设备的干扰最小的预定数目的终端设备的信息以及关于预定数目的终端设备与第一终端设备进行MU-MIMO通信的信干噪比的信息，基站可以根据从各候选终端设备反馈的该指示干扰的信息来确定要进行实际MU-MIMO传输的终端设备的组合以及该终端设备的组合中的各终端设备的调制编码策略。例如，作为反馈UE2和UE4的干扰值的替代或附加，可以反馈在存在UE2和UE4对UE1的干扰的情况下的信干噪比。
返回参考图5中的步骤S5006和S5008。根据本公开的一个实施例，可选地，用于无线通信系统的第一终端设备侧的通信方法还可以包括步骤S5006和S5008。
在步骤S5006中，测量来自基站的第二参考信号。该第二参考信号例如可以是现有技术中的CSI-RS。步骤S5006可以对应于图2中的步骤S2002，即现有技术中对CSI-RS进行测量的步骤，该测量未考虑同一小区内不同终端设备之间的干扰。
在步骤S5008中，基于第二参考信号的测量结果确定第一终端设备的信道状态并向基站反馈，以供基站确定第一预编码矩阵。向基站反馈的信息可以是例如图2所示的现有技术中进行MU-MIMO调度时在步骤S2004中反馈的信道状态信息，即可以包括RI、PMI和CQISU。
如上文描述过的，在已知的一些技术讨论中提出采用两级信道信息反馈方法来降低信道估计的复杂度及CSI反馈开销。在这样的方法中，终端设备可以量化短期CSI并将 其反馈给基站。然而，该短期CSI中虽然包含了其它终端设备对该终端设备造成的干扰，却无法指示干扰是由哪些终端设备造成的，也无法从中确定出具体的干扰值。
根据本发明的实施例，终端设备能够确定K个候选终端设备中的其它终端设备对其造成的干扰，并向基站反馈指示干扰的信息，例如上文中所例示的那些指示干扰的信息中的一个或多个。由此，基站能够更准确地把握各终端设备所受的干扰的情况，从而进行更精确的MU-MIMO调度。
接下来，参照图6和图7来说明根据本公开的实施例的用于无线通信系统的基站侧的电子设备及其通信方法。基站可以例如对应于图3中所示的基站。
图6示出根据本公开的实施例的用于无线通信系统的基站侧的电子设备6000的功能配置框图。在一个实施例中，电子设备6000可以包括例如存储器6010处理电路6020。
电子设备6000的存储器6010可以存储由处理电路6020产生的信息以及电子设备6000操作的程序和数据。存储器6010可以是易失性存储器和/或非易失性存储器。例如，存储器6010可以包括但不限于随机存取存储器(RAM)、动态随机存取存储器(DRAM)、静态随机存取存储器(SRAM)、只读存储器(ROM)以及闪存存储器。
电子设备6000的处理电路6020提供电子设备6000的各种功能。在本公开的实施例中，电子设备6000的处理电路6020可以包括第一预编码矩阵确定单元6021、第一预编码单元6022、第一参考信号发送单元6023和调度单元6024，分别被配置为执行后述图7中所示的用于无线通信系统的基站侧的电子设备的通信方法中的步骤S7000、S7002、S7004和S7006。
根据本公开的一个实施例，处理电路6020还可以包括第二参考信号发送单元6025，被配置为执行后述图7中所示的用于无线通信系统的基站侧的电子设备的通信方法中的步骤S7008。
处理电路6020可以指在计算系统中执行功能的数字电路系统、模拟电路系统或混合信号(模拟和数字的组合)电路系统的各种实现。处理元件可以包括例如诸如集成电路(IC)、专用集成电路(ASIC)这样的电路、单独处理器核心的部分或电路、整个处理器核心、单独的处理器、诸如现场可编程门阵列(FPGA)的可编程硬件设备、和/或包括多个处理器的系统。
另外，电子设备6000可以以芯片级来实现，或者也可以通过包括其它外部部件而以设备级来实现。例如，电子设备6000可以作为整机实现为基站设备，并且还可以包括一根或多根天线。
应当理解，上述各个单元仅是根据其所实现的具体功能所划分的逻辑功能模块，而 不是用于限制具体的实现方式。在实际实现时，上述各个功能单元可被实现为独立的物理实体，或者也可由单个实体(例如，处理器(CPU或DSP等)、集成电路等)来实现。
图7示出根据本公开的实施例的用于无线通信系统的基站侧的通信方法的流程图。该通信方法例如可以用于如图6所示的电子设备6000。
如图7所示，在步骤S7000中，根据从多个候选终端设备反馈的各自的信道状态，确定用于多个候选终端设备的第一预编码矩阵。步骤S7000可以例如对应于图3中的步骤S3000。
第一预编码矩阵可以用于对要发送给多个候选终端设备的第一参考信号进行波束赋形。根据本公开的一个实施例，第一预编码矩阵的确定准则是使得多个候选终端设备间的第一预编码后的信道最不相关。例如可以采用迫零算法等已知算法来确定第一预编码矩阵。
在步骤S7002中，用第一预编码矩阵对第一参考信号进行第一预编码。根据本公开的一个实施例，第一参考信号可以例如对应于图3的步骤S3002中的参考信号，而经第一预编码的第一参考信号可以对应于图3中的PC-RS。步骤S7002可以例如对应于图3中的步骤S3002。
在步骤S7004中，将经第一预编码的第一参考信号发送到多个候选终端设备。步骤S7004可以例如对应于图3中的步骤S3004。
在步骤S7006中，根据多个候选终端设备中的每个终端设备基于对接收到的经第一预编码的第一参考信号的测量结果以及关于第一预编码的信息而反馈的信息，对多个候选终端设备进行调度，其中每个终端设备反馈的信息指示多个候选终端设备中的其它终端设备对该终端设备的干扰。步骤S7006可以例如对应于图3中的步骤S3012。如参照上述图5描述的，关于第一预编码的信息可以包括例如候选终端设备的数量、第一终端设备所在的层的信息(例如终端设备i的编号i)等。如参考图3描述的[式2]所示出的，这些信息可以用于帮助估计等效信道Heffi。可选地，关于第一预编码的信息还可以包括第一终端设备(例如终端设备i)以外的其它候选终端设备所在的层的信息(例如终端设备j的编号j)，以确定终端设备j对终端设备i的干扰值。可选地，关于第一预编码的信息还可以包括用于指示第一参考信号的类型的参考信号类型指示符，以确定来自基站的经第一预编码的第一参考信号是用于测量多个候选终端设备间的干扰还是用于获取传统CSI。关于第一预编码的信息可以由基站发送给各个终端设备，也可以是默认的、预先设定或由终端设备自行根据测量情况估计的。后面将参照图8对此进行更详细的描述。
在一个实施例中，根据与基站相关联的小区中的活跃终端设备的情况，选择多个候选终端设备。例如，小区中同时存在M个活跃终端设备，基站可以从该M个活跃终端设 备中选择K个终端设备作为候选终端设备，其中K≤M。
在一个实施例中，基站对多个候选终端设备进行调度可以包括：从多个候选终端设备中选择要进行实际MU-MIMO数据传输的一个或多个终端设备。例如，基站可以根据从多个候选终端设备反馈的指示干扰的信息，从该多个候选终端设备中选择进行实际MU-MIMO数据传输时质量最好的终端设备的组合。
在一个实施例中，基站可以根据从每个候选终端设备分别反馈的比特图样来调整要进行实际MU-MIMO数据传输的终端设备的组合，以使得所选择的终端设备的组合中的各终端设备间的经第二预编码之后的信道最不相关，从而减小各终端设备之间的干扰。
在一个实施例中，基站对多个候选终端设备进行调度可以包括：确定用于针对所选择的一个或多个终端设备进行实际MU-MIMO传输的第二预编码矩阵。例如，基站可以根据所选择的终端设备的组合中的每个终端设备的PMI/CRI等信道方向信息，计算用于实际MU-MIMO数据传输的第二预编码矩阵。该第二预编码矩阵用于对将要传输的数据进行预编码。
在一个实施例中，基站对多个候选终端设备进行调度可以包括：对所选择的一个或多个终端设备分配合适的传输资源(例如资源块和发射功率等)。
在一个实施例中，基站对多个候选终端设备进行调度可以包括：确定针对所选择的一个或多个终端设备的调制编码策略，例如确定所选择的一个或多个终端设备各自的调制方案和数据传输速率。
返回参考图7中的步骤S7008。根据本公开的一个实施例，可选地，用于无线通信系统的基站侧的通信方法还可以包括步骤S7008。
在步骤S7008中，将第二参考信号发送给多个候选终端设备。多个候选终端设备基于对接收到的第二参考信号的测量结果而向基站反馈各自的信道状态。该第二参考信号例如可以是现有技术中的CSI-RS。步骤S7008可以对应于图2中的步骤S2000，即现有技术中发送CSI-RS的步骤。
如上文参照图5和图7所述，各终端设备基于对经第一预编码的第一参考信号的测量的结果和关于第一预编码的信息，确定其它终端设备对该终端设备的干扰。
在一个实施例中，基站可以向各候选终端设备发送关于第一预编码的信息，例如通过下行控制信息(DCI)来发送。
图8示出了根据本公开的实施例的MU-MIMO调度的一个例子的信令图，其中由基站向各候选终端设备发送关于第一预编码的信息，如步骤S8003所示。图8中的其它步骤 与图3中的对应的步骤相同，在此不再赘述。
在一个实施例中，在步骤S8003中，基站可以向终端设备1发送候选终端设备的数量K和终端设备1所在的层的信息，并向终端设备K发送候选终端设备的数量K和终端设备K所在的层的信息。此外，在资源块上承载PC-RS的资源元素不确定的情况下，基站还可以向各候选终端设备发送关于承载PC-RS的资源元素的信息以方便终端设备进行测量。
在一个实施例中，在步骤S8003中，基站还可以向终端设备发送用于指示参考信号的类型的参考信号类型指示符。例如，在基站向K个候选终端设备发送PC-CSI-RS的情况下，参考信号类型指示符可以用于指示该PC-CSI-RS是用于测量多个候选终端设备间的干扰还是用于获取传统CSI。例如，可以在下行控制信道上的DCI中添加1比特的信息作为参考信号类型指示符，基站向多个候选终端设备发送包括该参考信号指示符的DCI。如果候选终端设备接收到的参考信号指示符为0，则指示所观测到的PC-CSI-RS用于传统CSI获取，而如果候选终端设备接收到的参考信号指示符为1，则指示所观测到的PC-CSI-RS用于测量多个终端设备间的干扰。
在一个实施例中，基站可以在DCI format(DCI格式)0/4中的CSI字段增加1比特的信息作为参考信号类型指示符。在另一个实施例中，基站可使用当前DCI format 0/4中现有的CSI字段来承载参考信号类型指示符。例如，在终端设备只配置有一个下行小区的情况下，CSI请求字段(CSI request field)仍然使用2比特，其中第二个比特用作参考信号类型指示符。这样的规则在基站与各终端设备之间具有共识，从而各终端设备可以从CSI请求字段顺利读取参考信号类型指示符。
与图8示出的不同，在另一个实施例中，关于第一预编码的信息中的一项或多项可以是预先设定的。例如，候选终端设备的数量可以是预先设定的。在一个实施例中，基站选择预先确定的数量的终端设备作为候选终端设备，并提前向各终端设备通知该预先设定的数量。例如，基站可以通过半静态配置，提前配置好候选终端设备的数量。在另一个实施例中，候选终端设备的数量可以是默认的或者事先规定的，无需基站通知。这样可以减少DCI开销。
在一个实施例中，可以在候选终端设备侧确定关于第一预编码的信息，而无需基站发送或预先配置。例如，终端设备可以将接收信号中功率最大的一个所对应的层确定为自己所在的层，而将其它层确定为干扰终端设备所在的层。这样也可以减少DCI开销。
接下来，将参照图9A～9F、10A～10B、11A～11B、12A～12B来描述根据本公开的实施例的经第一预编码的第一参考信号(例如PC-RS)和第二参考信号(例如CSI-RS)在资源块上占用的情况。
图9A～9F、10A～10B、11A～11B、12A～12B是示出根据本公开的实施例的参考信号在资源块上的占用情况的示意图。在以上各图所示的资源块中，资源元素C0～C3分别对应于CRS端口0～3，资源元素D7～D14分别对应于DMRS端口7～14，资源元素R15～R22分别对应于CSI-RS端口15～22，用斜阴影线示出的资源元素对应于DCI区域，用横阴影线示出的资源元素对应于该资源块中未使用的其它CSI-RS端口。
根据本公开的实施例，经第一预编码的第一参考信号通过占用资源块上的特定的资源元素而被发送到各候选终端设备。在以上各图中，第一预编码的第一参考信号由“×”示出的资源元素来承载。
在一个实施例中，经第一预编码的第一参考信号与第二参考信号可以由不同的资源元素来承载。
例如，图9A示出了候选终端设备的数量K＝4的情况下参考信号在资源块上占用的情况。在图9A中，经第一预编码的第一参考信号由“×”示出的位置处的4个资源元素来承载而分别被发送到4个候选终端设备，第二参考信号由资源元素R15～R22(即CSI-RS端口15～22)来承载。
可替代地，图9B～9F示出了由不同的资源元素来承载经第一预编码的第一参考信号和第二参考信号的例子。图9B～9F与图9A的不同之处在于承载经第一预编码的第一参考信号的资源元素的位置不同。
另外，图9A～9F例示的承载经第一预编码的第一参考信号的资源元素的位置可以由通信协议固定。由此，候选终端设备可以在由通信协议固定的资源元素的位置处对来自基站的经第一预编码的第一参考信号进行测量。
应当理解，根据本公开的由不同的资源元素承载经第一预编码的第一参考信号与第二参考信号的实现方式不限于图9A～9F所示的情况。本领域技术人员在本公开的教导下，能够根据实际应用情况进行类似的设计，例如用资源块中没有被占用的资源元素来承载经第一预编码的第一参考信号。
另外，图9A～9F例示的是候选终端设备的数量K＝4的情况下参考信号在资源块上的占用情况。应当理解，本领域技术人员在本公开的教导下，能够对候选终端设备的数量为其它值的情况进行类似的设计。
在一个实施例中，经第一预编码的第一参考信号与第二参考信号可以由相同的资源元素来承载。
例如，图10A和10B示出了在候选终端设备的数量K＝4的情况下，用承载第二参考信号的资源元素R15～R22(即CSI-RS端口15～22)来承载经第一预编码的第一参考信 号的情况。在图10A中，由资源元素R15、R16、R19、R20来承载经第一预编码的第一参考信号和第二参考信号。在图10B中，由资源元素R17、R18、R21、R22来承载经第一预编码的第一参考信号和第二参考信号。
在一个实施例中，第二参考信号周期性传输，经第一预编码的第一参考信号可以在第二参考信号的周期性传输的间隙传输。
以图10A为例进行具体说明。在一个实施例中，基站通过资源元素R15、R16、R19、R20周期性地向终端设备发送第二参考信号。在需要进行MU-MIMO调度时，可以由基站在第二参考信号的周期性传输的间隙通过同样的资源元素R15、R16、R19、R20发送经第一预编码的第一参考信号。在一个实施例中，经第一预编码的第一参考信号的传输可以由终端设备来触发。另外，在不需要进行MU-MIMO调度时，基站可以自动终止经第一预编码的第一参考信号的发送，或者可以由终端设备通知基站终止经第一预编码的第一参考信号的传输。
通过使第二参考信号周期性传输，并且使经第一预编码的第一参考信号在第二参考信号的周期性传输的间隙传输，可以减少资源元素映射设计的开销，可以在不改变现有的资源块的布局的情况下传输经第一预编码的第一参考信号。
在一个实施例中，可以利用上文描述的参考信号类型指示符来通知终端设备对经第一预编码的第一参考信号进行测量。例如，如果候选终端设备接收到的参考信号指示符为0，则指示所观测到的经第一预编码的第一参考信号用于传统CSI获取，此时终端设备不对经第一预编码的第一参考信号进行多用户干扰测量；而如果候选终端设备接收到的参考信号指示符为1，则指示所观测到的经第一预编码的第一参考信号用于测量多个终端设备间的干扰，此时终端设备对经第一预编码的第一参考信号进行多用户干扰测量。在实际通信系统中，由于基站仅在需要时进行MU-MIMO调度而并不是进行周期性的MU-MIMO调度，因此与终端设备周期性地进行多用户干扰测量相比，通过参考信号类型指示符来指示终端设备是否进行多用户干扰测量能够节省信令开销。
另外，图10A～10B例示的是候选终端设备的数量K＝4的情况下经第一预编码的第一参考信号和第二参考信号占用相同资源元素的情况。应当理解，本领域技术人员在本公开的教导下，能够对候选终端设备的数量为其它值的情况进行类似的设计。
根据本公开的一个实施例，经第一预编码的第一参考信号可以通过码分多址方式占用相同的资源元素而被发送到多个候选终端设备。
在一个实施例中，可以通过正交码矩阵对经第一预编码的第一参考信号进行码分复用，使得经第一预编码的第一参考信号相互正交，从而可以占用资源块上的相同的时频资 源。为便于理解，可以用数学方式来示例性描述上述实施例。
以码分多址方式发送的经第一预编码的第一参考信号可以表示为：
[式3]
Figure PCTCN2017106996-appb-000005
其中C＝[c1,…,ci,…,cK]T表示一个K×N维的正交码矩阵，ci表示与终端设备i对应的正交码，为1×N的向量，N为正交码的码片长度，c1至cK这K个正交码相互正交；ni表示终端设备i处的接收噪声，为1×N的向量。[式3]中的其它符号的定义与[式1]相同。
终端设备i使用正交码矩阵C来处理接收信号，得到
[式4]
Figure PCTCN2017106996-appb-000006
其中，正交码矩阵C具有属性CCT＝IK，IK为K阶单位矩阵。
根据[式4]可以估计出等效信道Heffi。例如，当满足N≥K的条件时，可以通过经典的估计方法(如最小二乘法)来估计等效信道，本发明对此不作限制。
根据估计出的等效信道Heffi，终端设备可以通过与上文中参考[式2]描述的处理相同的处理来确定指示干扰的信息。
应当理解，上述的数学表示仅仅是为了方便描述而给出的示例而非限制，还可以采用别的方式来描述上述实施例。
图11A例示了在候选终端设备的数量K＝4的情况下的码分多址方式的经第一预编码的第一参考信号的资源占用情况。下面的描述中，用PC-RS来指代经第一预编码的第一参考信号。
在图11A中，采用码片长度N＝4的正交码矩阵C来对发送给K＝4个候选终端设备的PC-RS进行码分复用。正交码矩阵C表示如下，其中正交码矩阵C中的每一行用于一个候选终端设备，每一行的正交码相互正交。
Figure PCTCN2017106996-appb-000007
由于码分复用的PC-RS相互正交，因此发送给不同候选终端设备的PC-RS可以占用资源块上相同的四个资源元素(如图11A中“×”所示)而不产生干扰。这样的码分多址方式也称为全码分多址(Full CDM)方式。
在全码分多址方式下，由于每个PC-RS都占用多个资源元素而被发送到候选终端设备，与例如图9A～9F所示的每个PC-RS占用一个资源元素的情况相比，候选终端设备的观测空间更大，统计平均的效果更好，从而在终端设备处能够减小噪声对接收信号的影响。
图11B例示了另一种全码分多址方式的PC-RS的资源占用情况，与图11A的不同之处在于PC-RS所占用的资源元素的位置不同。
应当理解，根据本公开的全码分多址方式的PC-RS的资源占用不限于图11A～11B所示的情况。本领域技术人员在本公开的教导下，能够根据实际应用情况进行类似的设计，例如用资源块中没有被占用的资源元素来承载全码分多址方式的PC-RS。
另外，虽然未图示，但是也可以由相同的资源元素来承载根据本公开的全码分多址方式的经第一预编码的第一参考信号和第二参考信号。
另外，图11A～11B例示的是候选终端设备的数量K＝4的情况下PC-RS在资源块上的占用情况。应当理解，本领域技术人员在本公开的教导下，能够对候选终端设备的数量为其它值的情况进行类似的设计。
根据一个实施例，基站可以向候选终端设备发送码分多址的配置信息。终端设备利用从基站获取的码分多址方式的配置信息对测量结果进行处理，以确定其它终端设备对该终端设备的干扰。在一个实施例中，码分多址的配置信息可以包括正交码的码字信息。
图12A～12B示出根据本公开的另一个实施例的PC-RS在资源块上的占用情况的示意图，其中候选用户设备的数量K＝8。
如图12A所示，在一个实施例中，将候选终端设备分为两组，每组包括4个候选终端设备。将第一组候选终端设备对应的4个PC-RS通过全码分多址方式映射到资源块上的4个资源元素，并将第二组候选终端设备对应的4个PC-RS通过全码分多址方式映射到资源块上的另外的4个资源元素。其中，用于进行码分复用的两组正交码可以与图11A～11B中所示的正交码相同。这样的码分多址方式称为部分码分多址(Partial CDM)方式。
图12B例示了另一种部分码分多址方式的PC-RS的资源占用情况，与图12A的不同之处在于PC-RS所占用的资源元素的位置不同。
应当理解，根据本公开的部分码分多址方式的PC-RS的资源占用不限于图12A～12B所示的情况。本领域技术人员在本公开的教导下，能够根据实际应用情况进行类似的设计，例如用资源块中没有被占用的资源元素来承载部分码分多址方式的PC-RS。
另外，虽然未图示，但是也可以由相同的资源元素来承载根据本公开的部分码分多 址方式的经第一预编码的第一参考信号和第二参考信号。
另外，图12A～12B例示的是候选终端设备的数量K＝8的情况下PC-RS在资源块上的占用情况。应理解，本领域技术人员在本公开的教导下，能够对候选终端设备的数量为其它值的情况进行类似的设计。
下面将介绍根据本公开的应用示例。
本公开内容的技术能够应用于各种产品。
例如，基站可以被实现为任何类型的演进型节点B(eNB)，诸如宏eNB和小eNB。小eNB可以为覆盖比宏小区小的小区的eNB，诸如微微eNB、微eNB和家庭(毫微微)eNB。代替地，基站200可以被实现为任何其它类型的基站，诸如NodeB和基站收发台(BTS)。基站可以包括：被配置为控制无线通信的主体(也称为基站设备)；以及设置在与主体不同的地方的一个或多个远程无线头端(RRH)。另外，下面将描述的各种类型的终端均可以通过暂时地或半持久性地执行基站功能而作为基站工作。
例如，终端设备可以被实现为移动终端(诸如智能电话、平板个人计算机(PC)、笔记本式PC、便携式游戏终端、便携式/加密狗型移动路由器和数字摄像装置)或者车载终端(诸如汽车导航设备)。终端设备还可以被实现为执行机器对机器(M2M)通信的终端(也称为机器类型通信(MTC)终端)。此外，终端设备可以为安装在上述终端中的每个终端上的无线通信模块(诸如包括单个晶片的集成电路模块)。
[关于基站的应用示例]
(第一应用示例)
图13是示出可以应用本公开内容的技术的eNB的示意性配置的第一示例的框图。eNB 800包括一个或多个天线810以及基站设备820。基站设备820和每个天线810可以经由RF线缆彼此连接。
天线810中的每一个均包括单个或多个天线元件(诸如包括在多输入多输出(MIMO)天线中的多个天线元件)，并且用于基站设备820发送和接收无线信号。如图13所示，eNB 800可以包括多个天线810。例如，多个天线810可以与eNB 800使用的多个频带兼容。虽然图13示出其中eNB 800包括多个天线810的示例，但是eNB 800也可以包括单个天线810。
基站设备820包括控制器821、存储器822、网络接口823以及无线通信接口825。
控制器821可以为例如CPU或DSP，并且操作基站设备820的较高层的各种功能。 例如，控制器821根据由无线通信接口825处理的信号中的数据来生成数据分组，并经由网络接口823来传递所生成的分组。控制器821可以对来自多个基带处理器的数据进行捆绑以生成捆绑分组，并传递所生成的捆绑分组。控制器821可以具有执行如下控制的逻辑功能：该控制诸如为无线资源控制、无线承载控制、移动性管理、接纳控制和调度。该控制可以结合附近的eNB或核心网节点来执行。存储器822包括RAM和ROM，并且存储由控制器821执行的程序和各种类型的控制数据(诸如终端列表、传输功率数据以及调度数据)。
网络接口823为用于将基站设备820连接至核心网824的通信接口。控制器821可以经由网络接口823而与核心网节点或另外的eNB进行通信。在此情况下，eNB 800与核心网节点或其它eNB可以通过逻辑接口(诸如S1接口和X2接口)而彼此连接。网络接口823还可以为有线通信接口或用于无线回程线路的无线通信接口。如果网络接口823为无线通信接口，则与由无线通信接口825使用的频带相比，网络接口823可以使用较高频带用于无线通信。
无线通信接口825支持任何蜂窝通信方案(诸如长期演进(LTE)和LTE-先进)，并且经由天线810来提供到位于eNB 800的小区中的终端的无线连接。无线通信接口825通常可以包括例如基带(BB)处理器826和RF电路827。BB处理器826可以执行例如编码/解码、调制/解调以及复用/解复用，并且执行层(例如L1、介质访问控制(MAC)、无线链路控制(RLC)和分组数据汇聚协议(PDCP))的各种类型的信号处理。代替控制器821，BB处理器826可以具有上述逻辑功能的一部分或全部。BB处理器826可以为存储通信控制程序的存储器，或者为包括被配置为执行程序的处理器和相关电路的模块。更新程序可以使BB处理器826的功能改变。该模块可以为插入到基站设备820的槽中的卡或刀片。可替代地，该模块也可以为安装在卡或刀片上的芯片。同时，RF电路827可以包括例如混频器、滤波器和放大器，并且经由天线810来传送和接收无线信号。
如图13所示，无线通信接口825可以包括多个BB处理器826。例如，多个BB处理器826可以与eNB 800使用的多个频带兼容。如图13所示，无线通信接口825可以包括多个RF电路827。例如，多个RF电路827可以与多个天线元件兼容。虽然图13示出其中无线通信接口825包括多个BB处理器826和多个RF电路827的示例，但是无线通信接口825也可以包括单个BB处理器826或单个RF电路827。
(第二应用示例)
图14是示出可以应用本公开内容的技术的eNB的示意性配置的第二示例的框图。eNB 830包括一个或多个天线840、基站设备850和RRH 860。RRH 860和每个天线840可以经由RF线缆而彼此连接。基站设备850和RRH 860可以经由诸如光纤线缆的高速 线路而彼此连接。
天线840中的每一个均包括单个或多个天线元件(诸如包括在MIMO天线中的多个天线元件)并且用于RRH 860发送和接收无线信号。如图14所示，eNB 830可以包括多个天线840。例如，多个天线840可以与eNB 830使用的多个频带兼容。虽然图14示出其中eNB 830包括多个天线840的示例，但是eNB 830也可以包括单个天线840。
基站设备850包括控制器851、存储器852、网络接口853、无线通信接口855以及连接接口857。控制器851、存储器852和网络接口853与参照图13描述的控制器821、存储器822和网络接口823相同。
无线通信接口855支持任何蜂窝通信方案(诸如LTE和LTE-先进)，并且经由RRH 860和天线840来提供到位于与RRH 860对应的扇区中的终端的无线通信。无线通信接口855通常可以包括例如BB处理器856。除了BB处理器856经由连接接口857连接到RRH 860的RF电路864之外，BB处理器856与参照图13描述的BB处理器826相同。如图14所示，无线通信接口855可以包括多个BB处理器856。例如，多个BB处理器856可以与eNB 830使用的多个频带兼容。虽然图14示出其中无线通信接口855包括多个BB处理器856的示例，但是无线通信接口855也可以包括单个BB处理器856。
连接接口857为用于将基站设备850(无线通信接口855)连接至RRH 860的接口。连接接口857还可以为用于将基站设备850(无线通信接口855)连接至RRH 860的上述高速线路中的通信的通信模块。
RRH 860包括连接接口861和无线通信接口863。
连接接口861为用于将RRH 860(无线通信接口863)连接至基站设备850的接口。连接接口861还可以为用于上述高速线路中的通信的通信模块。
无线通信接口863经由天线840来传送和接收无线信号。无线通信接口863通常可以包括例如RF电路864。RF电路864可以包括例如混频器、滤波器和放大器，并且经由天线840来传送和接收无线信号。如图14所示，无线通信接口863可以包括多个RF电路864。例如，多个RF电路864可以支持多个天线元件。虽然图14示出其中无线通信接口863包括多个RF电路864的示例，但是无线通信接口863也可以包括单个RF电路864。
在图13和图14所示的eNB 800和eNB 830中，参考图6描述的处理电路6020中包括的一个或多个组件可被实现在无线通信接口912中。可替代地，这些组件中的至少一部分也可以由控制器821和控制器851实现。
[关于终端设备的应用示例]
(第一应用示例)
图15是示出可以应用本公开内容的技术的智能电话900的示意性配置的示例的框图。智能电话900包括处理器901、存储器902、存储装置903、外部连接接口904、摄像装置906、传感器907、麦克风908、输入装置909、显示装置910、扬声器911、无线通信接口912、一个或多个天线开关915、一个或多个天线916、总线917、电池918以及辅助控制器919。
处理器901可以为例如CPU或片上系统(SoC)，并且控制智能电话900的应用层和另外层的功能。存储器902包括RAM和ROM，并且存储数据和由处理器901执行的程序。存储装置903可以包括存储介质，诸如半导体存储器和硬盘。外部连接接口904为用于将外部装置(诸如存储卡和通用串行总线(USB)装置)连接至智能电话900的接口。
摄像装置906包括图像传感器(诸如电荷耦合器件(CCD)和互补金属氧化物半导体(CMOS))，并且生成捕获图像。传感器907可以包括一组传感器，诸如测量传感器、陀螺仪传感器、地磁传感器和加速度传感器。麦克风908将输入到智能电话900的声音转换为音频信号。输入装置909包括例如被配置为检测显示装置910的屏幕上的触摸的触摸传感器、小键盘、键盘、按钮或开关，并且接收从用户输入的操作或信息。显示装置910包括屏幕(诸如液晶显示器(LCD)和有机发光二极管(OLED)显示器)，并且显示智能电话900的输出图像。扬声器911将从智能电话900输出的音频信号转换为声音。
无线通信接口912支持任何蜂窝通信方案(诸如LTE和LTE-先进)，并且执行无线通信。无线通信接口912通常可以包括例如BB处理器913和RF电路914。BB处理器913可以执行例如编码/解码、调制/解调以及复用/解复用，并且执行用于无线通信的各种类型的信号处理。同时，RF电路914可以包括例如混频器、滤波器和放大器，并且经由天线916来传送和接收无线信号。无线通信接口912可以为其上集成有BB处理器913和RF电路914的一个芯片模块。如图15所示，无线通信接口912可以包括多个BB处理器913和多个RF电路914。虽然图15示出其中无线通信接口912包括多个BB处理器913和多个RF电路914的示例，但是无线通信接口912也可以包括单个BB处理器913或单个RF电路914。
此外，除了蜂窝通信方案之外，无线通信接口912可以支持另外类型的无线通信方案，诸如短距离无线通信方案、近场通信方案和无线局域网(LAN)方案。在此情况下，无线通信接口912可以包括针对每种无线通信方案的BB处理器913和RF电路914。
天线开关915中的每一个在包括在无线通信接口912中的多个电路(例如用于不同的无线通信方案的电路)之间切换天线916的连接目的地。
天线916中的每一个均包括单个或多个天线元件(诸如包括在MIMO天线中的多个天线元件)，并且用于无线通信接口912传送和接收无线信号。如图15所示，智能电话900可以包括多个天线916。虽然图15示出其中智能电话900包括多个天线916的示例，但是智能电话900也可以包括单个天线916。
此外，智能电话900可以包括针对每种无线通信方案的天线916。在此情况下，天线开关915可以从智能电话900的配置中省略。
总线917将处理器901、存储器902、存储装置903、外部连接接口904、摄像装置906、传感器907、麦克风908、输入装置909、显示装置910、扬声器911、无线通信接口912以及辅助控制器919彼此连接。电池918经由馈线向图15所示的智能电话900的各个块提供电力，馈线在图中被部分地示为虚线。辅助控制器919例如在睡眠模式下操作智能电话900的最小必需功能。
在图15所示的智能电话900中，参考图4描述的处理电路4020中包括的一个或多个组件可被实现在无线通信接口912中。可替代地，这些组件中的至少一部分也可以由处理器901或辅助控制器919实现。
(第二应用示例)
图16是示出可以应用本公开内容的技术的汽车导航设备920的示意性配置的示例的框图。汽车导航设备920包括处理器921、存储器922、全球定位系统(GPS)模块924、传感器925、数据接口926、内容播放器927、存储介质接口928、输入装置929、显示装置930、扬声器931、无线通信接口933、一个或多个天线开关936、一个或多个天线937以及电池938。
处理器921可以为例如CPU或SoC，并且控制汽车导航设备920的导航功能和另外的功能。存储器922包括RAM和ROM，并且存储数据和由处理器921执行的程序。
GPS模块924使用从GPS卫星接收的GPS信号来测量汽车导航设备920的位置(诸如纬度、经度和高度)。传感器925可以包括一组传感器，诸如陀螺仪传感器、地磁传感器和空气压力传感器。数据接口926经由未示出的终端而连接到例如车载网络941，并且获取由车辆生成的数据(诸如车速数据)。
内容播放器927再现存储在存储介质(诸如CD和DVD)中的内容，该存储介质被插入到存储介质接口928中。输入装置929包括例如被配置为检测显示装置930的屏幕上的触摸的触摸传感器、按钮或开关，并且接收从用户输入的操作或信息。显示装置930包括诸如LCD或OLED显示器的屏幕，并且显示导航功能的图像或再现的内容。扬声器931输出导航功能的声音或再现的内容。
无线通信接口933支持任何蜂窝通信方案(诸如LTE和LTE-先进)，并且执行无线通信。无线通信接口933通常可以包括例如BB处理器934和RF电路935。BB处理器934可以执行例如编码/解码、调制/解调以及复用/解复用，并且执行用于无线通信的各种类型的信号处理。同时，RF电路935可以包括例如混频器、滤波器和放大器，并且经由天线937来传送和接收无线信号。无线通信接口933还可以为其上集成有BB处理器934和RF电路935的一个芯片模块。如图16所示，无线通信接口933可以包括多个BB处理器934和多个RF电路935。虽然图16示出其中无线通信接口933包括多个BB处理器934和多个RF电路935的示例，但是无线通信接口933也可以包括单个BB处理器934或单个RF电路935。
此外，除了蜂窝通信方案之外，无线通信接口933可以支持另外类型的无线通信方案，诸如短距离无线通信方案、近场通信方案和无线LAN方案。在此情况下，针对每种无线通信方案，无线通信接口933可以包括BB处理器934和RF电路935。
天线开关936中的每一个在包括在无线通信接口933中的多个电路(诸如用于不同的无线通信方案的电路)之间切换天线937的连接目的地。
天线937中的每一个均包括单个或多个天线元件(诸如包括在MIMO天线中的多个天线元件)，并且用于无线通信接口933传送和接收无线信号。如图16所示，汽车导航设备920可以包括多个天线937。虽然图16示出其中汽车导航设备920包括多个天线937的示例，但是汽车导航设备920也可以包括单个天线937。
此外，汽车导航设备920可以包括针对每种无线通信方案的天线937。在此情况下，天线开关936可以从汽车导航设备920的配置中省略。
电池938经由馈线向图16所示的汽车导航设备920的各个块提供电力，馈线在图中被部分地示为虚线。电池938累积从车辆提供的电力。
在图16示出的汽车导航设备920中，参考图4描述的处理电路4020中包括的一个或多个组件可被实现在无线通信接口912中。可替代地，这些组件中的至少一部分也可以由处理器921实现。
本公开内容的技术也可以被实现为包括汽车导航设备920、车载网络941以及车辆模块942中的一个或多个块的车载系统(或车辆)940。车辆模块942生成车辆数据(诸如车速、发动机速度和故障信息)，并且将所生成的数据输出至车载网络941。
应当理解，本说明书中“实施例”或类似表达方式的引用是指结合该实施例所述的特定特征、结构、或特性系包括在本公开的至少一具体实施例中。因此，在本说明书中，“在本公开的实施例中”及类似表达方式的用语的出现未必指相同的实施例。
本领域技术人员应当知道，本公开被实施为一系统、装置、方法或作为计算机程序产品的计算机可读媒体。因此，本公开可以实施为各种形式，例如完全的硬件实施例、完全的软件实施例(包括固件、常驻软件、微程序代码等)，或者也可实施为软件与硬件的实施形式，在以下会被称为“电路”、“模块”或“系统”。此外，本公开也可以任何有形的媒体形式实施为计算机程序产品，其具有计算机可使用程序代码存储于其上。
本公开的相关叙述参照根据本公开具体实施例的系统、装置、方法及计算机程序产品的流程图和/或框图来进行说明。可以理解每一个流程图和/或框图中的每一个块，以及流程图和/或框图中的块的任何组合，可以使用计算机程序指令来实施。这些计算机程序指令可供通用型计算机或特殊计算机的处理器或其它可编程数据处理装置所组成的机器来执行，而指令经由计算机或其它可编程数据处理装置处理以便实施流程图和/或框图中所说明的功能或操作。
在附图中显示根据本公开各种实施例的系统、装置、方法及计算机程序产品可实施的架构、功能及操作的流程图及框图。因此，流程图或框图中的每个块可表示一模块、区段、或部分的程序代码，其包括一个或多个可执行指令，以实施指定的逻辑功能。另外应当注意，在某些其它的实施例中，块所述的功能可以不按图中所示的顺序进行。举例来说，两个图示相连接的块事实上也可以同时执行，或根据所涉及的功能在某些情况下也可以按图标相反的顺序执行。此外还需注意，每个框图和/或流程图的块，以及框图和/或流程图中块的组合，可藉由基于专用硬件的系统来实施，或者藉由专用硬件与计算机指令的组合，来执行特定的功能或操作。
以上已经描述了本公开的各实施例，上述说明是示例性的，并非穷尽性的，并且也不限于所披露的各实施例。在不偏离所说明的各实施例的范围和精神的情况下，对于本技术领域的普通技术人员来说许多修改和变更都是显而易见的。本文中所用术语的选择，旨在最好地解释各实施例的原理、实际应用或对市场技术的技术改进，或者使本技术领域的其它普通技术人员能理解本文披露的各实施例。

Claims (26)

  1. 一种用于无线通信系统的第一终端设备侧的电子设备，包括：
    存储器，用于存储计算机指令；以及
    处理电路，被配置为执行所存储的计算机指令以用于：
    测量来自基站的经第一预编码的第一参考信号，其中用于所述第一预编码的第一预编码矩阵是基站根据从多个候选终端设备反馈的各自的信道状态而确定的，其中所述多个候选终端设备包括第一终端设备；
    基于所述测量的结果以及关于所述第一预编码的信息，确定所述多个候选终端设备中的其它终端设备对第一终端设备的干扰；以及
    将指示所述干扰的信息反馈给基站。
  2. 根据权利要求1所述的电子设备，其中，所述处理电路还被配置为执行所存储的计算机指令以用于：
    测量来自基站的第二参考信号；以及
    基于第二参考信号的测量结果确定第一终端设备的信道状态并向基站反馈，以供基站确定所述第一预编码矩阵。
  3. 根据权利要求1或2所述的电子设备，其中，
    向基站反馈的指示所述干扰的所述信息包括以下之一：
    指示所述多个候选终端设备中对第一终端设备的干扰小于预定阈值的一个或多个终端设备的信息；
    指示所述多个候选终端设备中对第一终端设备的干扰小于预定阈值的一个或多个终端设备的信息以及相应的干扰值；
    指示所述多个候选终端设备中对第一终端设备的干扰小于预定阈值的一个或多个终端设备的信息以及关于所述一个或多个终端设备与第一终端设备进行多用户MIMO通信的信干噪比的信息；
    指示所述多个候选终端设备中对第一终端设备的干扰最小的预定数目的终端设备的信 息；
    指示所述多个候选终端设备中对第一终端设备的干扰最小的预定数目的终端设备的信息以及相应的干扰值；和
    指示所述多个候选终端设备中对第一终端设备的干扰最小的预定数目的终端设备的信息以及关于所述预定数目的终端设备与第一终端设备进行多用户MIMO通信的信干噪比的信息。
  4. 根据权利要求1至3中的任一项所述的电子设备，其中，关于所述第一预编码的信息包括以下至少之一：所述多个候选终端设备的数量信息；第一终端设备所在的层的信息；所述多个候选终端设备中的每个终端设备所在的层的信息；以及用于指示第一参考信号的类型的信息。
  5. 根据权利要求1至4中的任一项所述的电子设备，其中，所述处理电路还被配置为执行所存储的计算机指令以用于：
    从所述基站获取关于所述第一预编码的信息。
  6. 根据权利要求2至5中的任一项所述的电子设备，其中，
    经第一预编码的所述第一参考信号与所述第二参考信号由不同的资源元素来承载。
  7. 根据权利要求2至5中的任一项所述的电子设备，其中，
    经第一预编码的所述第一参考信号与所述第二参考信号由相同的资源元素来承载。
  8. 根据权利要求7所述的电子设备，其中，
    所述第二参考信号周期性传输，经第一预编码的所述第一参考信号在所述第二参考信号的周期性传输的间隙传输。
  9. 根据权利要求1至8中的任一项所述的电子设备，其中，
    经第一预编码的所述第一参考信号通过码分多址方式占用相同的资源元素而被发送到 所述多个候选终端设备。
  10. 根据权利要求9所述的电子设备，其中，所述处理电路还被配置为执行所存储的计算机指令以用于：
    从所述基站获取所述码分多址方式的配置信息；以及
    利用与第一终端设备对应的所述码分多址方式的配置信息，对所述测量的结果进行处理。
  11. 根据权利要求1至10中的任一项所述的电子设备，其中所述电子设备实现为所述第一终端设备，并且其中
    所述电子设备包括天线，经由所述天线从基站接收所述第一参考信号，并经由所述天线将指示所述干扰的信息发送给基站。
  12. 一种用于无线通信系统的基站侧的电子设备，包括：
    存储器，用于存储计算机指令；以及
    处理电路，被配置为执行所存储的计算机指令以用于：
    根据从多个候选终端设备反馈的各自的信道状态，确定用于所述多个候选终端设备的第一预编码矩阵；
    用所述第一预编码矩阵对第一参考信号进行第一预编码；
    将经所述第一预编码的第一参考信号发送到所述多个候选终端设备；以及
    根据所述多个候选终端设备中的每个终端设备基于对接收到的经所述第一预编码的第一参考信号的测量结果以及关于所述第一预编码的信息而反馈的信息，对所述多个候选终端设备进行调度，其中每个终端设备反馈的信息指示所述多个候选终端设备中的其它终端设备对该终端设备的干扰。
  13. 根据权利要求12所述的电子设备，其中，所述处理电路还被配置为执行所存储的计算机指令以用于：
    将第二参考信号发送给所述多个候选终端设备，
    其中，所述多个候选终端设备基于对接收到的第二参考信号的测量结果而向基站反馈所述各自的信道状态。
  14. 根据权利要求12或13所述的电子设备，其中，所述处理电路还被配置为执行所存储的计算机指令以用于：
    根据与所述基站相关联的小区中的活跃终端设备的情况，选择所述多个候选终端设备。
  15. 根据权利要求12至14中的任一项所述的电子设备，其中，关于所述第一预编码的信息包括以下至少之一：所述多个候选终端设备的数量信息；第一终端设备所在的层的信息；所述多个候选终端设备中的每个终端设备所在的层的信息；以及用于指示第一参考信号的类型的信息。
  16. 根据权利要求12至15中的任一项所述的电子设备，其中，所述处理电路还被配置为执行所存储的计算机指令以用于：
    向所述多个候选终端设备中的每个终端设备发送关于所述第一预编码的信息。
  17. 根据权利要求13至15中的任一项所述的电子设备，其中，
    经所述第一预编码的第一参考信号与所述第二参考信号由不同的资源元素来承载。
  18. 根据权利要求13至15中的任一项所述的电子设备，其中，
    经所述第一预编码的第一参考信号与所述第二参考信号由相同的资源元素来承载。
  19. 根据权利要求18所述的电子设备，其中，
    所述第二参考信号周期性传输，经所述第一预编码的第一参考信号在所述第二参考信号的周期性传输的间隙传输。
  20. 根据权利要求12至19中的任一项所述的电子设备，其中，
    将经第一预编码的第一参考信号通过码分多址方式占用相同的资源元素而发送到所述 多个候选终端设备。
  21. 根据权利要求20所述的电子设备，其中，所述处理电路还被配置为执行所存储的计算机指令以用于：
    向所述多个候选终端设备中的每个终端设备发送所述码分多址方式的配置信息。
  22. 根据权利要求12至21中的任一项所述的电子设备，其中，
    对所述多个候选终端设备进行调度包括：从所述多个候选终端设备中选择要进行多用户MIMO数据传输的一个或多个终端设备。
  23. 根据权利要求22所述的电子设备，其中，
    对所述多个候选终端设备进行调度还包括以下至少之一：确定用于针对所选择的一个或多个终端设备进行多用户MIMO传输的第二预编码矩阵；为所选择的一个或多个终端设备分配传输资源；以及确定针对所选择的一个或多个终端设备的调制编码策略。
  24. 一种用于无线通信系统的通信方法，包括：
    第一终端设备测量来自基站的经第一预编码的第一参考信号，其中用于所述第一预编码的第一预编码矩阵是基站根据从多个候选终端设备反馈的各自的信道状态而确定的，其中所述多个候选终端设备包括第一终端设备；
    第一终端设备基于所述测量的结果以及关于所述第一预编码的信息，确定所述多个候选终端设备中的其它终端设备对第一终端设备的干扰；以及
    第一终端设备将指示所述干扰的信息反馈给基站。
  25. 一种用于无线通信系统的通信方法，包括：
    基站根据从多个候选终端设备反馈的各自的信道状态，确定用于所述多个候选终端设备的第一预编码矩阵；
    基站用所述第一预编码矩阵对第一参考信号进行第一预编码；
    基站将经所述第一预编码的第一参考信号发送到所述多个终端设备；以及
    基站根据所述多个终端设备中的每个终端设备基于对接收到的经所述第一预编码的第一参考信号的测量结果以及关于所述第一预编码的信息而反馈的信息，对所述多个候选终端设备进行调度，其中每个终端设备反馈的信息指示所述多个候选终端设备中的其它终端设备对该终端设备的干扰。
  26. 一种计算机可读存储介质，包括可执行指令，当所述可执行指令由信息处理装置执行时，使所述信息处理装置执行根据权利要求24或25所述的通信方法。
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